oracle_jedi Posted April 23, 2020 Share Posted April 23, 2020 Paranoid Little Man has some games he adapted to run off cartridge on his website. The files are 128K, so after splitting they are 64K. The CO70208 board only seems to accept 27C64, 27C128 and 27C256 chips. In an older thread, @atarifan49 stated that you had to add a 27LS08 chip to the board to make it support the larger PROM chip, but didn't offer up a schematic. Does anyone have that mod to allow the larger PROM chips to be used on the this board? Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted April 23, 2020 Share Posted April 23, 2020 It can be done simpler, with 2 diodes instead LS chip: And for those with 27C256 EPROMs - you can split those 64 KB files in 2 32 KB with some hex editor, for instance. Quote Link to comment Share on other sites More sharing options...
oracle_jedi Posted April 24, 2020 Author Share Posted April 24, 2020 Thanks for the schematic @ParanoidLittleMan I'll try to find some time this weekend to see how to mod the board with these extra diodes. I don't have the board in my hand right now but I don't recall the resistor being there either. If I get it working I'll post an update. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.