Mar 28, 2016
Old mask ROM vs. new EPROM
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Old mask ROM vs. new EPROM
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Two diodes later, and I was able to dump an EA8332 ROM! Now for the real test: burning a 2532 EPROM
Got in a few things in the mail today: 28-pin ZIF sockets, 4 of them to be exact. And a single 2532 EPROM. The 2532 is pin-compatible with the 8332 mask ROM, which will simply my H19 programming process significantly.
Plus, all of other machines seem to use 2532′s, but my EPROM programmer doesn’t have a setting for that specific wiring configuration. So I made an adapter board! This is going to simplify my programming process quite a bit. The adapter board is made out of a little protoboard, some short wire wrap grade wires (why didn’t I buy these sooner?), and a long machine pin 28 pin socket with gold plating.
The 2532 is running it’s cycle in the UV eraser as we speak.
I’ve manged to remove the hard-soldered traces that determine chip select, address lines, and voltages for the H19 ROMs.
There are two sockets in the design, but most implementations are new enough to use a single EA8332 Mask ROM, instead of two EA8316′s. I had to cut a few traces, due to the late era of this board’s manufacture. However, now it matches the style of the oldest variations, with the flexibility that was intended.
I also removed 4 of the 5 on-board linear voltage regulators and hard-wired the board to accept +5V, +12V, and -12V directly from a power supply. Now I just need to perform some tests with a bench power supply to confirm that I’ve done it correctly. After that, I need to swap in some custom ROMs and hope it all works out.