First post, by wiretap
- Rank
- Oldbie
Designed a little boot ROM card this morning for running various ROMs in one of my XT boards that doesn't have additional ROM sockets. It has a jumper block for setting a wide variety of addresses as designated on the silkscreen. Should work on XT-->486 and other systems. I saw some other boards for sale that are similar, but they use more parts and are more expensive -- this should be a pretty cheap option if you want to build just a simple/small boot ROM card. I designed it for a 27C256 EPROM/OTP since those are pretty common and cheap.
KiCAD, gerbers, BOM attached. Not tested yet, but I have some boards on order.
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EEPROM Version that is flashable, supporting 28C64B and 28C256. This one should be better if you need to configure and flash the chip from within the PC itself. (configurable ROMs) - just put the write enable jumper on:
^--the black box (S1) is a little DPDT switch, no 3D model available.