From: phil@morris0.fsnet (2001)
Newsgroups: rec.games.video.arcade.collecting
Subject: Re: Space Invaders - games that run on the 'CV' boardset?
Date: Fri, 18 Apr 2003 18:30:32 GMT


Space Invaders (3 layer) boardset - Single EPROM Hack (27128)

- The board that I took this from had the jumpers on the ROM board set
to use 2708's
- Remove all EPROMs from the ROM board
- Take a 28 pin DIL socket and bend out pins: 1, 2, 21, 22, 23, 26,
27, 28
- Plug this socket into the 24-pin socket at location IC31 (EPROM 6)
ensuring that pin 14 of the 28-pin socket lines up with pin 12 of the
24-pin socket (therefore pins 1, 2, 27, 28 of the 28-pin socket hang
over the edge)
- Wire pin 1 to pins 27 and 28 and then connect to a +5VDC source
(wherever is convenient)
- Wire pin 2 to S7 (3rd link up)
- Wire pin 21 to S5 (5th link up)
- Wire pin 22 to S8 (2nd link up)
- Wire pin 23 to S6 (4th link up)
- Wire pin 26 to the third PTH up, just to the left of the 'S8' text

Program a 27128 with the Space Invaders code. Merge the four binaries
as follows:

copy /B invaders.h+invaders.g+invaders.f+invaders.e inv-27128.bin

Plug in the EPROM and power up!


Alternatively, the binaries that you merge can be from another
compatible game, such as the colour version of Space Invaders.

Phil