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HP-41CX w/ XF-Module - just curious
07-26-2019, 03:23 PM
Post: #22
RE: HP-41CX w/ XF-Module - just curious
(07-26-2019 01:23 PM)Ángel Martin Wrote:  BTW this may also be taken advantage of by the CL, which comes with the Time ROM loaded but there's no TIME circuitry: when you plug an external physical TIME module to it that's the one that gets the deal, so to speak. Not sure it's the same mechanism but it'd make sense...


In the CL page 5 accesses never appear on the external bus. The hardware knows that page 5 is internal, so the address is modified before going to the bus driver. This is what prevents bus conflicts with an inserted Time Module. The ROM in the Time Module itself is never accessed, only the peripheral registers are.
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RE: HP-41CX w/ XF-Module - just curious - Monte Dalrymple - 07-26-2019 03:23 PM

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