MC5 ROM Module
author: bradleyb
2 layer board of 1.90 x 0.93 inches (48.3 x 23.7 mm)
Uploaded:
November 11, 2026
Shared:
November 11, 2026
Total Price:
$8.85
Designed to hold a 128KB (27C010) or 256KB (27C020) EPROM.
For 128KB, short JP1 and JP3.
For 256KB, short JP2 and populate U2. The chip type of U2 is not labeled, but presumed to be an AND gate, i.e. 74HC08, used to make the chip /CE go low when either of the module’s enable lines goes low.
CR1 and CR2 are Schottky diodes, 20V reverse voltage. C1 and C2 are 100nF bypass capacitors
The female connectors are just regular “dupont” style crimp terminals, repurposed. Use the housing from an existing MC5 ROM module as a jig to keep them in place when soldering.
Designed to hold a 128KB (27C010) or 256KB (27C020) EPROM.
For 128KB, short JP1 and JP3.
For 256KB, short JP2 and populate U2. The chip type of U2 is not labeled, but presumed to be an AND gate, i.e. 74HC08, used to make the chip /CE go low when either of the module’s enable lines goes low.
CR1 and CR2 are Schottky diodes, 20V reverse voltage. C1 and C2 are 100nF bypass capacitors
The female connectors are just regular “dupont” style crimp terminals, repurposed. Use the housing from an existing MC5 ROM module as a jig to keep them in place when soldering.
