ab0tj
Experienced Member
Inspired by the Lo-Tech 1MB RAM board which is great for adding UMBs to XT class systems, I set out to design a 16 bit version for AT class systems. It can selectively fill 0-512K in 64KB chunks (which is probably already maxed out on most ATs) and 512-1024K in 32K chunks, though obviously some of those areas won't ever be available for memory anyway.
Attached are the schematics and design I came up with. After they're tested and debugged, I intend to make PCBs and maybe built boards available to the community. Anyone feel like taking a look to tell me what mistakes I've made?
Schematic: https://drive.google.com/file/d/17V2zu1NKI3wbEPl9qkvuWUZT8U-jKmxk/view?usp=sharing
Board Layout: https://drive.google.com/file/d/1T_tJj_RjK2Zs6zy09Ox9cGhOANk3G1Av/view?usp=sharing
GAL code: https://drive.google.com/file/d/1dv9bP9okc4JlIlSiGOcfOpW9wE8lbC8h/view?usp=sharing
Attached are the schematics and design I came up with. After they're tested and debugged, I intend to make PCBs and maybe built boards available to the community. Anyone feel like taking a look to tell me what mistakes I've made?
Schematic: https://drive.google.com/file/d/17V2zu1NKI3wbEPl9qkvuWUZT8U-jKmxk/view?usp=sharing
Board Layout: https://drive.google.com/file/d/1T_tJj_RjK2Zs6zy09Ox9cGhOANk3G1Av/view?usp=sharing
GAL code: https://drive.google.com/file/d/1dv9bP9okc4JlIlSiGOcfOpW9wE8lbC8h/view?usp=sharing