COMMODORE 64 4x16KB I/O1 AUTOMATIC SHUT-OFF CARTRIDGE

This is a tested and working circuit board.

This Commodore 64 cartridge is capable of auto-shut-off.

A standart C64 cartridge locates to a part of memory area, and does not let this part of memory to be used, but this cartridge transfers the program in to C64 memory and then it can shut itself off, so the memory becomes available, free to use.

8K Cartridge locates $8000-$9FFF (ROML) and 16K Cartridge locates $8000-$9FFF / $A000-$BFFF (ROML / ROMH)

This auto-shut-off function is needed when the program or you need to use that memory area.

For example; if you are using a loader program from a standart generic cartridge, you can not load your program ($8000-$9FFF) in the memory area, because cartridge acts as a ROM (Read Only Memory) and occupates that memory area.

You can use this (4x16KB I/O1 off) cartridge in two ways.

First way; this cartridge can work as a standart 16KB Commodore 64 cartridge. You can delete first 80 bytes of a 16KB .CRT image and program that file into a 27c128 eprom**.

Second way is; Using this cartridge with I/o1 shut-off function.

For preparing 16KB eprom image; you need Vice emulator, Hex editor and a Windows PC

An easy way to use I/o1 shut-off function is to use C64 "DELA EPROMMER II" program*.

Preparing I/O1 AUTOMATIC SHUT-OFF Eprom Image (Max. 16KB)

Copy "dela eprommer ii.prg" and your sellected C64 file(s) to a directory, then run "dela eprommer ii" in Vice emulator.

1- press 6 and go to second menu

2-Press G for cartridge preparing

3-Press 2 for electronic shut-off cartridge

4-Press 1 for I/O1 shut-off

5- You can press 1 for only one programm whitout menu, or you can press 2 for multi program with a menu

6-1- If you pressed 1 you need to write file name to load. (or $ to see directory) , If you pressed 2 then continue from 7-1

6-2- Press J to confirm the file

6-3- Press J to save the image file

6-4- For saving, Write a name and enter for eprom image.

6-5- Press 1 for ending

6-6- If it creates a .PRG file,you need to delete the first 2 Bytes using the HEX Editor, If it creates a .P00 file,you need to delete first 28 Bytes and save it.

6-7-Eprom image is ready.

7-1- If you pressed 2 you need to write file name to load. (or $ to see directory)

7-2- Press J to confirm the file

7-3- Assign a key for selecting and runing the file from menu, by pressing the key.

7-4- Press 1 for ending adding files or press 2 for adding another file to cartridge and go on from 7-1 (total max limit with menu is 16KB).

7-5-If you pressed 1, you will design a start page list of files and associated letters for runing.

7-6-To end, when cursor on the "ENDE" you will press "ENTER"

7-7- Press J to save the image file

7-8- For saving, write a name for eprom image, and press "ENTER".

7-9- Press 1 for ending.

7-10- If it creates a .PRG file,you need to delete the first 2 Bytes using the HEX Editor, If it creates a .P00 file,you need to delete first 28 Bytes and save it.

7-11-Eprom image is ready.

---You can use 27C128 (16KB) eprom, one 16KB bank without switches.

---You can use 27C256 (32KB) eprom, two seperate 16KB banks with switch1,

1BANK $0000-$3FFF

2BANK $4000-$7FFF

** if you use 27c256 and single image then image have to start from $4000 (last 16k bank)

---You can use 27C512 (64KB) eprom, four seperate 16KB banks with switch1 and switch2,

1BANK $0000-$3FFF

2BANK $4000-$7FFF

3BANK $8000-$BFFF

4BANK $C000-$FFFF

** if you use 27c512 and single image then image have to start from $C000 (last 16k bank)

* You can download "DELA EPROMMER II" C64program and some sample eprom images from the bottom of this page.

In order to protect your electronical devices, always turn off your Commodore 64 before connecting or unconnecting any device.

Gerber files can be changed over time. Before paying for the PCBs, be sure to update your orders!

Gerber files can be changed at any time. Before paying for the PCBs, be sure to update your orders!

Have fun

Thank you.

COMPONENTS:

27C128 or 27C256 or 27C512 or W27C512

74LS00 or 74HC00

1nf CAPACITOR

2PCS. 10K 1/4WATT RESISTANCE

2PCS. 3pin 2.54mm SPDT slide SWITCH

RIGHT ANGLE TACTILE BUTTON (For optional RESET)

If your programmer have capability to test IC chips, like 74LS series, then you should not forget to test them before soldering, some chips may have defect. (TL866 Minipro Programmer is able to test some of logic IC)