8K ROM

Another of the simple boards, the 8K ROM board is little more than a breakout board for a 27C64 EPROM and little bit of decoding for the enable line

Data lines D0 - D7 and address lines A0 - A12 connect directly to the EPROM for 8K of addressable memory.  Address lines A13, A14 & A15 need to all be low for the Chip Enable to be triggered, which places it in the ox000 - 0x1FFF address space.  The RD and MREQ need to be low to trigger the Output Enable

Click the image below for schematics in PDF format

Bill of Materials

• PCB
• 34 pin R/A header
• 28 pin wide DIL socket
• 14 pin narrow DIL socket
• 27C64 EPROM
• 74ls32