Re: Max ram on a 71B Message #8 Posted by Reinhard Hawel on 16 Apr 2001, 5:50 p.m., in response to message #7 by Chris Catotti (Florida)
I believe they could hardwire 8 * 32k RAM into a HP-71B, so there was (in theory) place for an 128k card reader port module and 4 front port modules (together 128k).
These sum up to 512 kBytes and would surely cause an ERR:configuration together with the HP-IL module(16k), the I/O address space (32k ?) and the ROM (64k)
I have to search for my older EDUcalc catalogues.
I looked into my HP papers 5 seconds and found some younger catalogues (1991 and 1995).
There was no theoretical limit to the daisy-chaining method (yes, the plugin units were configured with software commands in the OS during startup code). An exception is the 48k Forth ROM (Assembler and Translator) where a 32k part was hard configured to #E0000 - #EFFFF. There was an additional 16k Soft configured part in the module.
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