Test Circuit used for ACID reverse engineering

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ACID Reverse Engineering

Schematic

Desoldered ASIC chip from Fano's cartridge (thanks, Fano), attached to PC's parallel printer port: 

 ACID        PC
 CLK    ---- Strobe
 CCLR   ---- Init
 SIN    ---- Busy
 /OE    ---- Select
 A0..A7 ---- Data 0..7
 GND,5V ---- GND,5V

Pictures

  • Original messy circuit

  • Top

  • Bottom

  • Anonymous clean desk

This is original circuit, assembled while I was visiting my parents. I couldn't find a 36pin centronics socket, only a (very) old 25pin RS232 cable, so I needed to use that.

  • Newer clean circuit

  • Top

  • AcidTestHomeBottom.jpg

    Bottom

  • Nocash Headquarters

When I came back home, I wrecked the original circuit, and made a miniaturized adapter with robust centronics socket. Not that I'd still really needed it, I've been already done with the rev engineering at that time - I just didn't like messy cables.

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