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Found these inside a non-working 71B
03-13-2018, 07:17 PM (This post was last modified: 03-13-2018 07:37 PM by J-F Garnier.)
Post: #67
RE: Found these inside a non-working 71B
(03-13-2018 05:41 PM)Paul Berger (Canada) Wrote:  In the document of the proceeding of the 1985 HHC Atlanta conference there is an article written by Jim De Arras who appears to have been from Hand Held Products and he states that they originally made 64K memory modules, but ran into a bug in the original OS.
Yes, this is a bug of the ROM 1BBBB. It is mentioned in the Soft Forth documentation (since Soft Forth requires a 64k port for application development).

(03-13-2018 06:19 PM)Paul Berger (Canada) Wrote:  Reading a little more about the memory configuration you could have a RAM module that contains more than 32K bytes the 64K nibble limit is for an individual chip but a module could contain more than one chip, ...
The HHP card reader RAM modules (made of 32K boards) can be configured to create a 64K port from two boards. See here for instance (the link to the file is dead, use this instead).
Unfortunately, it is not possible (or not known) to do the same with 32K CMT modules -well it should be possible since the CMT01 programmer does it.

BTW, I'm still interested by any information on the 1LQ4 chip. Somebody once said that a documentation exists but never shared.

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RE: Found these inside a non-working 71B - J-F Garnier - 03-13-2018 07:17 PM
What's U10? - Dave Frederickson - 03-15-2018, 03:43 PM

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