Thread: hp-41cx / NoV-64d / Hepax XF multi-function

[Ángel Martin]

(09-10-2023 02:14 PM)brouhaha Wrote:  ......
41CX page 3 (single bank) and page 5 (bank switched) are in one 120kbit chip. A bank switch fetched as an instruction from either page 3 or page 5 will switch the page 5 bank, but have no effect on any other pages, including pages 4, 6, 7, or ports. In particular, a bank-switched printer ROM such as 82242A infrared printer module in port 6 will not affect the 41CX page 5 or vice versa.
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This is a clarifying view, however I don't fully understand how to apply it to the 82242A infrared printer module and page#6 case: where's the 120kbit chip in that instance? We know only page#6 bank-switches, leaving page#7 alone of course. I think that's where the "independent page" bank-switching model comes from.

Best,
ÁM