[ DOCS ] : 1541 Flash! Kernal Documentation

[Note from Weasel]:
I have edited this document substantially for formatting and spelling errors. I have also removed sections that talk about sending your hardware to a no-longer-existing business, because while I’m only doing all this for posterity and “love of the game”, somebody is going to eventually follow the (now-ill-advised) directions, and expect me to take responsibility for their own dumbassery. Apparently that’s the world we live in today, so I’m pre-emptively taking responsibility for others’ complete lack of it, and removing the opportunity for somebody to virtually shoot themselves in the foot.
Otherwise, I’m not going to squirm and wring hands over copyright when the manufacturer is long out of business, the manual is no longer published or sold, and the devices it discusses are now featured in museums and retro collections (not in production/manufacturer no longer exists). I have the scanned version of the manual archived here as well, in case I’ve left an error in place that’s causing confusion.

1541 FLASH! INSTRUCTION MANUAL
by
BOB SKYLES & BRYCE NESBITT

SKYLES ELECTRIC WORKS, INC.
231-E South Whisman Road
Mountain View, CA 94041 U.S.A.

Copyright (c)1984 by Skyles Electric Works, Inc.

All rights reserved.  No part of this publication may be reproduced, stored in a  retrieval system, or transmitted, in any form or by any means electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of Skyles Electric Works, Inc..  No patent liability is assumed with respect to the use of the information contained in this manual.

Skyles Electric Words, Inc. has used care in preparing this manual, it assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein.

1541 FLASH! and CableCard are trademarks of Skyles Electric Works Inc.

Commodore 64 and Commodore 1541 are trademarks of Commodore Business Machines

The program modifications to the Commodore 64 Kernal ROM and the 1541 Disk Drive operating system ROM are copyrighted by Bryce Nesbitt.  All rights reserved.

Introduction

Congratulations of purchasing 1541 FLASH! Assembly, the fastest add on assembly for disk loading and saving programs from the Commodore 1541 disk drive and the Commodore 64.  In addition to being the fastest disk drive enhancement available for the Commodore 64 and the 1541 disk drive, over 30 added commands are included.  These commands wil make using your Commodore 64 much faster and easier.  It is not necessary that you learn or use these commands.

Install the 1541 FLASH! Assembly and enjoy a whole new world of speed.

WHAT 1541 FLASH! WILL NOT DO

• 1541 FLASH! will not, repeat, not fix or improve the loading of a marginal or non functioning disk drive. 
• 1541 FLASH will not speed up a program load or file transfer that involves lots of blinking of the red error light on the Commodore 1541 disk drive.  If you are having trouble (lots of error light blinking) with just one or two disks, and the rest work okay, replace your faulty disks. 
• If you are having trouble loading all your diskettes, your disk drive usually needs cleaning, lubricating, aligning, or electronic repair. 

Skyles Electric Works warrants the 1541 FLASH! Assembly parts and labor for 4 months from date of purchase.  Please take a moment now to fill out and return the postpaid warranty card.      Installation instructions start on page 29.  They are at the end of the manual because they are used only once and then hopefully forgotten.  Please turn to page 29 and start enjoying your 1541 Flash!.

     Starting on the next page is a quick reference card covering the extra commands added by the 1541 FLASH!.

ENJOY

Description of Symbology

• Capital letters refer to keys struck in sequence.
• <CTRL> refers to a single key struck
• <SHIFT><RUN/STOP> strike two keys simultaneously
• <RET> strike “RETURN” key

Easy Everyday Commands

Symbology

We have adopted the following symbology for all the commands used in this manual.

First you should note that all the keys on the Commodore 64 have upper case letters on their top surface.  We refer to all the keys therefore with upper case (capital) letters.  If we wish you to strike a series of keys in sequence like normal typing we present the the sequence as follows:

• If you should type “load” we show LOAD without any quotes or brackets.
• Spaces between typing letters are for clarity only.  SYS 65526 is exactly the same as SYS65526 to the Commodore 64.
• If you should strike a function key such as “run/stop” we show <RUN/STOP> with brackets.  We have abbreviated “return” to <RET>.
• If you should strike two function keys together we show <SHIFT><RUN/STOP>
• If you should strike two function keys one after the other we show <C=>,<CRTL>.
• WE use both a comma and a space between keys.

DOS Commands

Preface

The “DOS”, or as they are sometimes called, “wedge” commands are a set of minimum keystroke commands for controlling the disk drive.  Commodore furnishes a DOS program on the 1541 demonstration disk that accompanies the Commodore 1541 Disk Drive. This program occupies a small part of your computer memory and sometimes interferes with programs.  1541 FLASH! has a DOS program built in.  This means that there are no programs to load or fill up memory.

• These DOS commands work with any Commodore 1541 disk drive with or without 1541 FLASH! installed.
• The major keystroke saving that DOS offers is that the sequence of keystrokes;
• OPEN 1,8,15,”   is replaced by a single keystroke; <@> or < > >.
• The alternate command the “greater than” symbol was initially favored and gave the name “wedge” commands to the original DOS program.  On the Commodore 64 the “>” requires two simultaneous keystrokes.  We recommend that you use the “@” instead.

@$0:PROGRAM*  <RET>

If after reading the error message, you wish to reset (clear) the disk drive type:

Blinking Red Light on the Disk Drive

Occurs when the disk command has not been accepted by the disk drive.  The first thing to do is to ask the disk drive to tell you its problem;  @ <RET>.  Usually the answer will be obvious.  If not, refer to the 1541 Drive Errors Reference above.  Except furnishing you with an easy method of issuing disk commands, 1541 FLASH! does not affect the disks response to commands.  The following is repeated from the introduction of this manual:

WHAT 1541 FLASH! WILL NOT DO

• 1541 FLASH! will not, repeat, not fix or improve the loading of a marginal or non-functioning disk drive. 
• 1541 FLASH will not speed up a program load or file transfer that involves lots of blinking of the red error light on the Commodore 1541 disk drive. 
• If you are having trouble (lots of error light blinking) with just one or two disks, and the rest work okay, replace your faulty disks.  If you are having trouble loading all your diskettes, your disk drive usually needs cleaning, lubricating, aligning, or electronic repair.

Editing Commands

Preface

The following are a group of ten commands added to the 1541 FLASH! to make program writing easier and more enjoyable. If you do not write programs, BASIC or Machine Language, skip this section of the manual.  For programmers we also recommend the purchase of “VICTREE” model VT64. VICTREE is a module that plugs into the cartridge port of the Commodore 64 and adds 42 very useful commands.  15 of the VICTREE commands are programming aids.  VICTREE model VT64 is available from you local dealer or contact Skyles Electric Works.

The editing commands in this section requires the installation of 1541 FLASH! in the Commodore 64.  The 1541 Disk Drive is not directly involved with these commands.

UNDOCUMENTED FEATURES OF THE 1541

Yes, the 1541 Disk Operating System (DOS) has some useful undocumented features. We present here some of the most useful ones.

OPEN2,8,2,"INVALIDFILE,S,M"  

OPEN2,8,2,"EXISTINGFILE,S,A"  

OPEN1,8,15,"C0:COMBINED=FILE1,FLE2,FLE3,FLE4"

OPEN2,8,2,"FILE,m,a"  

Advanced Programming Commands

Introduction

This section is intended for experienced 65XX programmers.  It will describe how to access the interface from machine language. Also included are several new commands that provide the fastest way to access data with the 1541 Flash! interface.

Drive Commands

OPEN1,8,15,"I"

PRINT#1,"Z13"+chr$(1)+chr$(0)

PRINT#1,"Z1"+CHR$(128+2)

OPEN1,8,15,"I"

PRINT#1,"Z20"+chr$(24)+chr$(16)

OPEN1,8,15,"I"

PRINT#1,"Z31"

SYS GETBUF

OPEN1,8,15,"I"

PRINT#1,"Z52"+chr$(4)+chr$(6)

SYS GETBUFF

OPEN1,8,15,"I"

PRINT#1,"Z63"+chr$(18)+chr$(0)

SYS READ

OPEN1,8,15,"I"

PRINT#1,"Z72"

The NMI Debugging Aid

Introduction

This command is used to peek at what the processor is doing at any one moment.  The NMI debugger will print the entire processor status on the screen at each NMI or when the <RESTORE> key is pressed.  Use it to check on crash locations, questionable code and even errant IRQ routines transparently to the host program except for a couple of missing cycles.  If you wish to trace in real time, set up CIA #2 to generate continuous NMI’s.

Example

 pha     ;save all processor registers
txa
pha
tya
pha     ;space for your own routine, such as
;checking the break key
jmp $f7bd     ;print status and exit.

Details

To use this function, point the NMI vector at $0318-$0319 to the routine above.  Data is printed on the screen indirectly via locations $d0-$d1 (the BASIC editor screen pointer so do not worry about setting that up).  After printing the NMI debugger jumps to $ea81, returning from the interrupt. Data appears in the format – (.Y .X .A SR AL AH SP)-.  Note that the NMI stuffs six things on the stack, the SP printed will read six too low.

General Notes

1. Unless the drive is in the slow mode, the UI+ and UI- commands have no meaning.
2. Location $0298 in the drive will disable head “kick” via the track #1 stop when set to $ff instead of $00.
3. Location $f2d1 in the kernal is a hex convert subroutine.
4. Bit 6 in the file type byte of a directory entry is a scratch protect.  When it is set to a one the drive will not scratch the file even with a command like >s0:*.
5. If you have a promenade promburner, and are burning 2764’s try using ‘0,4,7’ for the PMW instead of ‘0,5,7’ or ‘0,5,14’. Burning will then take as little as four seconds with full reliability! (thanks to Jay Stevens for this tidbit)
6. A bug in the 6526 is ‘interrupt stomping’. Two interrupts can stomp on each other, with both thinking they happened (ie. their timers are reset) but without telling the processor about it.  On the 6522 the supposedly benign act of reading the IFR register can (and repeatedly does) reset flags and lines at inopportune moments.
7. Your software can identify a 1541 Flash! upgrade computer by checking $fff6 in the Kernal.  It will contain a $4c. An old, slow, C-64 will have a $52 in the same location.  Location $fff9 will have $ff, an old 64 will have $59.

1541 BUGS

The 1541 has many bugs in its operating system.  Here is a description for reference.  Many bugs are fixed by 1541 FLASH!.

Problem:   “Disk ID Mismatch error” at seemingly random times.
Solution:   Send a “I0” command before the offending disk instruction is sent.  From the DOS Commands send “>I0” or “@I0”.

Problem:   ‘@ save and replace’ screws up my entire disk!!
Solution:   1541 FLASH! does not fix this (sorry) but it will help you to know when and why this happens.  The bug is in the half of the ROM that 1541 FLASH! does not affect.  It happens when there is a multiple of 16 directory entries on the disk.  It does not matter if there are full.  The pointers to all the files get scrambled.  The conclusion, don’t use “@, save and replace” unless you have less than 16 files on disk.

Editors note, I believe that I have had this problem with less than 16 files.  My advice is do not use “save and replace”.

Problem:   There are not enough buffers free for what I want to do. (ie. “No Channel Error”)
Solution:   This is an interesting problem. The 1541 DOS is really a 4040 DOS partially modified for a single drive.  When you open a file, specify drive 0 and the DOS will not have to keep a buffer open for the RAM of the non-existent drive 1. 

Example:

OPEN2,8,2,"0:FILE,S,R".

Problem:   “Drive Not Ready Error”
Solution:   Don’t believe what the manual says about this error.  It usually means the DOS is confused and is trying to look at drive 1, which is non-existent.  What you should do is convince the DOS that you want drive 0. When you initialize use “I0”.  Whenever you save,open a file, look at the directory or even read (the last is optional) you should SPECIFY drive 0.

Example  

SAVE"0:GARBAGE",8

Overheating

The 1541 does have overheating problems. 1541 FLASH! goes a long way to solving the problem, due to the increased speed of the data transfer.  The drive and stepper motors are turned on less.  If you still have problems with 1541 FLASH! installed then I have two suggestions:

1. Turn off your drive when not in use. It is OK to turn the drive off and on while the computer is operating but not accessing the disk.
2. Consider putting spacers under the four feet of the disk drive.  “Pink Pearl” brand erasers work well.  Get six and put two each under the front feet.  The incline seems to help even more.
3. For the mechanically inclined another solution is to add a head sink.  Look on the right side of your drive below the two large silver regulators where two small screws hold a ‘L’ shaped metal bar to the side of the case.  Fashion a heatsink with lots of fins and attach it to the screws.  Then drill a couple of large holes in the plastic below this spot.  This will reduce the ambient temperature all over the drive but especially next to the 6502 the ROM and the write timing circuit. Next take a flat metal sheet about 2*8 cm, bend it so it will stand on its end, then glue it to the top of the 6502.  Repeat this step with any chip that feels too hot.

1541 FLASH! INSTALLATION

Installation of your 1541 FLASH! will take about 30 minutes.  It may be done in two parts, installing the Commodore 64 parts (2) and then at a later date installing the 1541 disk drive and parts.  The following installation instructions are detailed and lengthy so that hopefully every question and concern that might come up is answered.  For most Commodore 64s anybody familiar with the use of a Phillips screwdriver can easily install the 1541 FLASH!.

If you are concerned about “getting your fingers into” your Commodore 1541 Disk Drive and your Commodore 64 Computer, please have your local dealer install the 1541 FLASH!.  If your computer or disk drive are under their original 90 day Commodore warranty, remember that if you carefully follow the installation instructions you can always return the computer and the disk drive to their original condition without Commodore or the local dealer being upset.

We don’t recommend that you wait 90 days of old slow disk program loading before you take advantage of the 1541 FLASH!’s fantastic loading speeds.  You would also miss out on the other very useful added commands that you get with 1541 FLASH!

Installation of the 1541 FLASH! requires:

• A Phillips (Crosshead) screwdriver
• A thin bladed knife or screwdriver, (a grapefruit segment knife is ideal).

PARTS IDENTIFICATION

While Gaul may have been divided into 3 parts there are four parts to the 1541 FLASH!:

1. Kernal ROM assy. and Socket
2. CableCard
3. 1541 Operating ROM Assy.
4. FLASH! Cable

They are pictured below.

Installation : Commodore 64

We will first install two 1541 FLASH! assemblies in the Commodore 64.

1. Unplug all cables, cartridges, and peripheral assemblies from your Commodore 64.
2. Place the Commodore 64 upside down on a well lighted surface. The front edge of the C-64 should be toward you.
3. Using the Phillips screwdriver remove the 3 screws located in wells along the front bottom of the C-64.
4. Holding the C-64 together at the front, place it right-side up.
5. Now carefully lift the front top half of the C-64. This should unsnap the back catches. Set the top half of the C-64 about 3 inches forward.
6. If your Computer has the metalized cardboard inner cover, untape it and open the cardboard
7. There are two slightly different styles of electronics boards inside the C-64. Using the picture two pages ahead locate the Kernal ROM.
8. The Kernal ROM should have one of the following numbers on it:
   • 901227-01
   • 901227-02
   • 901227-03
9. The Kernal ROM should be in a socket. However in a small percentage of C-64 the Kernal ROM is soldered into the main electronics board. If your Kernal ROM is soldered and not in a socket, reverse the previous steps and see your local dealer about removing the Kernal ROM and installing a 24 pin socket in its place. The 24 pin socket is furnished as part of the Kernal ROM assembly and socket. If you are unable to have your local dealer replace a soldered in Kernal ROM with a 24 pin socket, you may send your Commodore 64 packed into its original carton postage paid to Skyles Electric Works. [instructions outlining how to send your beloved and hard-to-replace hardware off to a non-existent business removed here]

10. Using your flat bladed tool (knife or screwdriver) gently pry up the Kernal ROM. Pry from both ends so that it comes straight up out of the socket. Be careful not to pry up the socket from the main electronics board.
11. Note that there is a small notch on the rearmost end of the Kernal ROM when it is in it’s socket. Place the Kernal ROM behind your Computer with small notch away from you.
12. Remove the 24 pin socket from the 24 pin plug on the bottom of the Kernal ROM Assembly.
13. Now place the Kernal ROM assembly, with the three wire cable toward the rear of your computer, over the Kernal ROM socket. Be sure the 24 pins of the plug are lined up over the 24 holes of the socket. Gently plug the Kernal ROM Assembly into the Kernal ROM socket.
14. Carefully plug the 24 pin Kernal ROM, with the small notch toward the rear of your computer into the 24 pin socket on the left side of Kernal ROM Assembly. Use your finger to keep the Kernal ROM Assembly flat while you plug in the Kernal ROM. Refer to the next page for reassurance as to where the Kernal ROM is installed.

15. Check that there are no pins outside of the Kernal ROM socket on the main electronics board and that the Kernal ROM has no pins sticking outside of the 24 pin socket on the Kernal ROM Assembly. The notches of both ROMs now on the Kernal ROM Assembly should be toward the rear of the computer.
16. Thread the white connector on the end of the 3 wire (red, white, and blue) cable through the left side of the leftmost connector hole on the back bottom of your C-64.
17. Check and reconnect if necessary the Keyboard cable and the power light cable connectors. Your C-64 should appear as shown in the accompanying pictures on the opposite page. Now is the time to check carefully the installation to this point.
18. Re-tape the metalized cardboard if required and replace, backside first, the top of your computer onto the bottom half of the housing. Check that both sides are lined up. If not, readjust the top.
19. Turn over your computer and reinstall the three screws that you removed from the 3 wells in the front edge of the bottom of your C-64. Do not over tighten these screws.

20. With your computer upside down plug the blue connector of the CableCard onto the main electronics board edge connector that is on the far rightside, when the computer is upside down and the front edge is toward you. The blue connector, the small switch, the four pin connector, and the six pin connector should all be visible on the CableCard when the computer is upside down. The CableCard is plugged into the User Port (Modem port) or Parallel port.
21. Plug the red-white-blue cable into the 4 pin connector near the small switch on the CableCard. The red wire should be nearest the computer and the blue wire should be farthest from the computer. The picture on the next page shows the plugged in CableCard with the computer upside-down.
22. Turn your Commodore 64 right side up. The CableCard and 1541 FLASH! label should be visible at the far left rear of your computer (picture bottom of next page). Return your computer to its normal operating location. Reconnect all cables and peripherals.
23. Check that the small switch on the left outside of the CableCard is switched away from the computer.
24. Turn on your Commodore 64, 1541 Disk Drive, Monitor or TV set, and any other peripherals.

25. Test your system by operating it. Everything should still work the same as before you began the installation. Load a program from the 1541 disk drive. If you do not get a normal load, recheck installation starting with item 10.
26. Turn off your C-64 and then switch the small switch on the CableCard toward the computer
27. Turn on your C-64 and observe the 1541 FLASH! copyright message. You should see: ***COMMODRE 64 BASIC V2 *** W/1541 FLASH! 38911 BYTES FREE (C) 1984 BRYCE NESBITT
28. Now Type: POKE 148,64 and strike the RETURN key.
29. Reload the program from disk that you loaded in step 25 above. Everything should still occur in the old slow mode. Now proceed to the next page for installation of 1541 FLASH! into your 1541 Disk Drive.
30. If you have trouble with one of the tests described above carefully recheck the installation instructions starting at step 1.
31. If you are still having trouble replace your oriinal Kernal ROM into its socket and test that this has returned the computer to it’s original condition. Every 1541 FLASH! is tested before leaving the factory, but mistakes can happen. Notify your local dealer for test and/or 1541 FLASH! replacement.

Installation : Commodore 1541 Disk Drive

We will first install two 1541 FLASH! assemblies in the Commodore 1541.

1. Unplug all cables and peripheral assemblies from your Commodore 1541.
2. Place the Commodore 1541 upside down on a well lighted surface. The front edge of the 1541 should be toward you.
3. Using the Phillips screwdriver remove the 4 screws located in wells at each corner on the bottom of the 1541.
4. Holding the 1541 together at the sides place it right side up.
5. Now carefully light the top half of the 1541. This should expose a metal inner cover. Set the top half of the 1541 to one side.
6. Now remove the two screws on the left side of the metal cover. Lift the metal cover off and set to one side.
7. There are two different styles of electronics boards inside the 1541. Using the drawing shown 2 pages forward locate your style of main electronic board and the two components related to the 1541 FLASH installation.
8. The Operating ROM should have one of the following numbers on it:
   • 901229-01
   • 901229-03
   • 901229-05
   • 901229-04 (recalled by Commodore)
9. There two 6522 chips in the 1541 drive and their locations are quite different on each style of main electronics board. Use the pictures on the next page to help in locating the right one.
10. Using your flat bladed tool (knife or screwdriver) gently pry up the Operating ROM. Pry from both ends so that it comes straight up out of the socket. Be careful not to pry up the socket from the main electronics board.
11. Note that there is a small notch on the rearmost end of the Operating ROM when it is in its socket. Insert operating ROM into the black foam and store in a safe place.
12. Remove the black plastic foam from the 24 pin plug on the bottom of the 1541 Operating ROM Assembly.
13. Now place the 1541 Operating ROM Assembly toward the rear of your disk drive over the Operating ROM socket. Be sure the 24 pins of the plug are lined up over the 24 holes of the socket. Gently plug the Operating ROM Assembly into the Operating ROM socket. Check the next page for the correct location.

14. Using your flat bladed tool (knife or screwdriver) gently pry up the FLASH! Input 6522. Pry from both ends so that it comes straight up out of the socket. Be careful not to pry up the socket from the main electronics board.
15. Set the FLASH! Input 6522 in front of you and locate pin 19. The top picture on the next page shows the numbering of the pins. Note that the notch end of all electronics chips in the 1541 disk drive are toward the rear of the drive
16. Check the picture on the previous page that you have removed the correct 6522. If you have, use your flat bladed tool to bend pin 19 straight out from the FLASH! Input 6522 clip. Please see the picture on the next page for details of where to bend the pin. Do not attempt to bend the pin back to its original position. It will usually break if you attempt to return it to its original position.
17. Return the FLASH! Input 6522 to its original socket. Note the small notch should be on the end toward the rear of the 1541 drive.
18. Making sure that all 29, of the 40, pins are lined up, carefully press the FLASH! Input 6522 back into it’s original socket.
19. Check the pictures on the previous page that you have FLASH Input 6522 and the 1541 Operating ROM Assembly in their proper orientation and location.

20. Place the FLASH! Cable behind the 1541 drive. Lay the unjacketed portion of the cable on top of the left edge of the 1541 electronics board.
21. Connect the black microclip to pin 18, with the black microclip going underneath pin 19 and coming from the front of the 1541 drive. Please see the picture on the next page for the location of this microclip.
22. Check the connection and placing of the black microclip to pin 18. Tape the microclip to the 1541 electronics board as shown on the next page.
23. Connect the white microclip to pin 19 as shown on the next page.
24. Check the connection of the white microclip to pin 19 and tape it down as shown on the next page.
25. With the Phillips screwdriver remover the screw located at the left rear corner of the 1541 electronics board.
26. Place the screw through the FLASH! Cable ground lug and screw it back in place at the right rear corner of the 1541 electronics board. On some earlier 1541s there is already a ground lug on this screw. If that is the case you should now have 2 ground lugs on the left rear corner of the 1541 electronics board. Page 46 Installation 1541 Disk Drive

27. Using the picture on the next page as a guide route the wires from the microclips and the ground lug off the left side of the 1541 electronics board, around the outside of the bottom case post, under the serial plugs, and over the top of the fuse holder.
28. Remove the cover paper from the FLASH Cable strain relief and stick it directly below the fuse holder. Do not place any strain on the strain relief for the first 24 hours.
29. Without replacing the top covers, return your 1541 disk drive to its normal operating location
30. Lifting up your computer, plug in the 6 pin plug at the end of the FLASH! Cable into the keyed connector on the bottom side of the CableCard
31. Check that the small switch on the CableCard is toward the Commodore 64.
32. Turn on your C-64 and observe the 1541 FLASH! copyright message. You should see: ***COMMODORE 64 BASIC V2 *** W/1541 FLASH! 38911 BYTES FREE (C) 1984 BRYCE NESBITT
33. Now turn on your 1541 Disk Drive and other equipment.

34. Reload the program from disk that you loaded in step 25 of the C-64 installation instructions. Time the load cycle. The program should load three times faster than previously.
35. Type:
    • POKE 148,64 :OPEN 1,8,15,”Z8S” <RET>
36. Reload the program from step 34 above. Time the load. It should be 3 times slower than in step 34 above. It probably is already getting difficult to consider loading all your programs at this slow speed.
37. Type:
    • POKE 148,0 :OPEN 1,8,15,”Z8F” <RET>
38. Reload the program from disk that you loaded in step 34 and 36 above. Time the load cycle. The program should load three times faster than the load in step 36.
39. Turn off your C-64 and then switch the small switch on the CableCard away from the computer
40. Turn on your C-64 and observe the original Commodore 64 turn-on message. You should see: *** COMMODORE 64 BASIC V2 *** 64K RAM SYSTEM 38911 BASIC BYTES FREE READY
41. Now Type:
    • OPEN1,8,15,”Z8S” <RET>
42. Reload the program from step 34 above. Time the load. It should be about 3 times slower than in step 34 above. By this time it probably getting very tedious to load at the slow speed.
43. If you have trouble with one of the tests described above, carefully recheck the installation instructions starting at step 1.
44. If you are still having trouble, replace your original Kernal ROM in the C-64 and the original Operating ROM in the 1541 Disk Drive. Test that this has returned the computer and disk drive to their original condition. Every 1541 FLASH! is tested before leaving the factory, but mistakes can happen.
45. This completes the test of the 1541 FLASH!. Carefully replace the metal inner cover on the 1541 Disk Drive. The 2 small sheet metal screws are used to attach in on the left side.
46. Unplug the power and serial cable from the 1541 disk drive.
47. Replace the plastic top cover on the 1541 disk drive.
48. Holding the two halves together turn the 1541 disk upside down.
49. Insert the four screws into the the four corner wells on the bottom of the 1541.
50. Turn the 1541 right side up and reinstall the power and serial cables. Turn on the 1541 disk drive.
51. Turn off your C-64. Switch the small switch on the CableCard toward the C-64. Turn on your C-64.
52. Reload the program from disk that you loaded in step 25 of the C-64 installation instructions. Time the load cycle. The program should load three times faster than previously.
53. This completes the installation of the 1541 FLASH!. Please now read the section of the manual covering the “Easy Everyday Commands”.