Test Circuit used for ACID reverse engineering: Difference between revisions
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== Schematic == | == Schematic == | ||
Desoldered [[ | Desoldered [[ACID]] chip from [[User:Fano| Fano]]'s cartridge (thanks, Fano), attached to PC's parallel printer port: | ||
ACID PC | ACID PC | ||
CLK ---- Strobe | CLK ---- Strobe | ||
| Line 11: | Line 11: | ||
A0..A7 ---- Data 0..7 | A0..A7 ---- Data 0..7 | ||
GND,5V ---- GND,5V | 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 == | == Pictures == | ||
<gallery caption="Original circuit"> | <gallery caption="Original messy circuit"> | ||
Image:AcidTestOldTop.jpg|Top | Image:AcidTestOldTop.jpg|Top | ||
Image:AcidTestOldBottom.jpg|Bottom | Image:AcidTestOldBottom.jpg|Bottom | ||
Image:AcidTestOldWorkplace.jpg| | Image:AcidTestOldWorkplace.jpg|Parents desk | ||
</gallery> | </gallery> | ||
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. | 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. | ||
| Line 23: | Line 28: | ||
---- | ---- | ||
<gallery caption="Newer circuit"> | <gallery caption="Newer clean circuit"> | ||
Image: | Image:AcidTestHomeTop.jpg|Top | ||
Image: | Image:AcidTestHomeBottom1.jpg|Bottom | ||
Image: | Image:AcidTestHomeWorkplace.jpg|Nocash Headquarters. | ||
</gallery> | </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 | 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:CPC Plus]][[Category:Cartridges| ]][[Category:DIY]] | |||
[[Category:CPC History]] | |||
Latest revision as of 22:07, 19 December 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.
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.