Reply 60 of 71, by Jager
Ok, looks like I've routed everything. Now it's time to correct silkscreen, optimize and double-check everything else. And I've probably have lots of time for this - Utsource still can't send me IC's I've ordered. Few notes:
1) It's 2mb only for now. 1mb won't work due to schematic modifications I've made to simplify routing, 4mb was considered risky due to increase routing complexity and, possibly, bios limitations. Although it's still possible to add additional 2mb through double-stacking - RAS0 is available at TP1.
2) I've opted for 39SF010A instead of 27c256 EPROM. Due to it's capacity you can use two ROM images up to 64K (32K VGA + 32K extra, XT-IDE for example) - selectable with a jumper. 32K-64K selection needs some soldering though.
dirkmirk wrote on 2020-06-27, 14:18:
Also have the STB Nitro 64 2meg.
Can you please share it's bios? I've found Diamond's v2.02, but not STB's V1.1.