64K-CUPCAKE-CARTHello,This is a tested and working circuit.64K-CUPCAKE-CART is a 64KB capacity Commodore 64 cartridge.64K-CUPCAKE-CART is designed for making a cartridge, from any ".PRG" extension Commodore 64 software.".PRG" extension C64 software is a single part working c64 program. Multiple part loading software are not suitable for this cartridge.64K-CUPCAKE-CART can also work as a generic 16KB C64 game cartridge.64K-CUPCAKE-CART can also work as a 16KB I/O-1 automatic shutdown DELA module. (You can prepare 16KB module roms with "dela eprommer ii" program.)ROM FILE CREATING (via windows pc)Inside the "64K_CUPCAKE_CART.zip" file you will find two files. "SAMPLE.BIN" and "starter64k.bin""SAMPLE.BIN" is a sample ROM file, you can just program it into a w27c512 and begin to enjoy your cartridge."starter64k.bin" is a 513 BYTES code, for transfering data from cartridge to computer memory, and then shut the cartridge off.To prepare a ROM file for 64K-CUPCAKE-CART; first, you need to get a ".PRG" extension C64 program/game, and run it, to see if it is working.Then you need to load your ".PRG" extension program from a "HEX Editor" software. (you can use free "HxD Hex Editor") Then sellect and delete first and second bytes of your ".PRG" extension program. (2 bytes from the beginning)(it is usually "01 08")"Sellect all" and "copy" it.Then load "starter64k.bin"" file from the "Hex Editor"."Paste" the coppied data after last Byte of starter64k, (line 200) after (FF). (FF will remain)Save the file with a new name like "EPROM.BIN"Your ROM file is ready for programming.Download link for "starter64k.bin" and sample ROMhttps://archive.org/download/64kcupcakecart/64K_CUPCAKE_CART.zipCOMPONENTS64K-CUPCAKE-CART PCBCD4516BEDIP16 IC SOCKET (Some cd4516be chips can be defective, you should use a socket)2pcs. 1N4148 DIODE2pcs. 68K 1/4 watt RESISTANCE1μF ELECTROLYTIC CAPACITOR (any voltage more than 5volts)w27c512 (CUPCAKECART is suitable for 27128 (16KB), 27c256 (32KB), 27c512 (64KB))DIP28 IC SOCKET (For eprom)You also need an "Eprom Programmer" for programing your ROM file in to eprom.In order to protect your electronical devices, always turn off your Commodore 64 before connecting or unconnecting any device.Gerber files can be changed at any time. Before paying for the PCBs, be sure to update your orders!Have funThank you.
