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Found these inside a non-working 71B
03-11-2018, 11:11 PM (This post was last modified: 03-11-2018 11:16 PM by MikeSD.)
Post: #34
RE: Found these inside a non-working 71B
Might have found the missing 2nd FORTH ROM. I was assuming I had a 64K RAM config. It might bea 32K, and the 2nd FORTH.

one device is marked HM?256LFP (assume 32k RAM) but the other is unmarked. Might be ROM.

So the modification might add 32K RAM, FORTH (2 ROMs), and a Math ROM. Now, if i can just get these tested and the 71B working. Spent the whole day tearing apart an documenting. Need a break to digest all this.

[Image: Unmarked_FTH.jpg]

[Image: 256.jpg]
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RE: Found these inside a non-working 71B - MikeSD - 03-11-2018 11:11 PM
What's U10? - Dave Frederickson - 03-15-2018, 03:43 PM

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