|Re: So Eric, what's with the new hardware?|
Message #11 Posted by HrastProgrammer on 28 Sept 2005, 1:35 a.m.,
in response to message #9 by Eric Smith
though unless I modify the microcode it will have the same effective capacity as the 41CX with two extended memory modules.
From my experience: it is possible to address 3392 data/program registers by modifying the firmware (I have done this 4 years ago). But, you'll have to change a lot of things, not only in HP-41 ROM ...
Modified extended function module microcode might allow for the equivalent of an extra twelve extended memory modules, for a total of 3459 usable registers of extended memory.
I really doubt you can have extra 12 XM modules ... you'll have to completly rewrite XF/XM module and all parts of CCD, Advantage and perhaps some other modules dealing with extended memory. The best I came to (without sacrifying too much of a compatibility) was 686 XM registers. Again, this is from my experience and can, as well, be wrong ...
The SD slot is for mass storage. The intention is to write a compatible replacement for the mass storage functions of the HP-IL module.
Do you plan to rewrite the complete HP-IL ROM or provide the HP-IL hardware emulation and use the existing HP-IL ROM?
I may hack the microcode for alpha display to remove the special-casing of the punctuation, and always display only 12 characters in alpha mode. (Making it use 16 characters would be substantially more work.)
The emulation of display instructions and a lot of things have to be changed in HP-41 ROM (Printer ROM, ...) but it is possible to have 16-characters LCD ...