Test Circuit used for ACID reverse engineering: Difference between revisions

Revision as of 11:20, 26 July 2010

ACID Reverse Engineering

Schematic

Desoldered ACID 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

Source Code

For curiosity, here's the original source code used for reverse-engineering. It's barely commented or user-friendly.

Media:AcidTest.asm

Pictures

Original messy circuit
Top
Bottom
Parents 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
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 don't like messy cables.

@@ Line 31: / Line 31: @@
 Image:AcidTestHomeTop.jpg|Top
 Image:AcidTestHomeBottom1.jpg|Bottom
-Image:AcidTestHomeWorkplace.jpg|Nocash Headquarters. Lamers: don't try this at home
+Image:AcidTestHomeWorkplace.jpg|Nocash Headquarters.
 </gallery>
 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 don't like messy cables.
 [[Category:Hardware]][[Category:Cartridges| ]][[Category:DIY]]
-[[Category:CPC History]][[Category:Stub]]
+[[Category:CPC History]]