17 Oct
2002
17 Oct
'02
6:29 a.m.
Hi folks:
I am forwarding this on behalf of John Shadbolt, a buddy of mine who is not
on this list -- he describes below a technique for reading HP-85 roms, for
burning into eproms, which can then run from the prog-rom card.
gil
From: john_shadbolt(a)talk21.com
To: gil(a)vauxelectronics.com
Date: Thu, 17 Oct 2002 09:54:03 GMT+01:00
Subject: Reading HP series 80 ROMs
Gil,
Here is the procedure I used, please post this 'as is' onto cctalk,
including my spam proof e-mail & web site address:
Reading HP Series 80 ROMs
=========================
Here are the steps.
You need:
HP series 80 machine with Assembler ROM or EPROM :-), a serial adapter, a
PC. I have
performed the following on my HP-85, I assume this will work on
a 86/87/9915.
1. Determine the ROM number for the ROM. You may have this anyway (as it
is used for
error messages). For example my guess for the HP 85 EMS ROM is
that it is 317 octal / 207 decimal (the same as for the HP 87 EMS ROM which
I do have). To check run the command:
MEM 60000:207,2
This should display
317 061
If not then you need to try other numbers in the MEM command from 1 to 254
(eg usng
a FOR / NEXT loop) until you have found all the ROMs on the system
(the Assembler ROM is 40 decimal). The first two bytes of the ROM are the
ROM number followed by the complement of the ROM number.
2. Connect up a PC to the serial port and capture the output from the HP 85.
3. CRT IS 10 - to redirect output to PC.
4. MEM 60000:207,20000
This dumps 8192 bytes + text to the PC. Then send me the file on e-mail
(john_shadboltREMOVETHISBIT(a)talk21.com) and I will run a conversion program
to make it into binary, I can then send you the binary + Intel hex file
version to blow onto a 2764 EPROM.
5. To use the EPROM the Programmable ROM module and also I assume the 9915
carrier
has to have switches set to show the ROM number.
I will publish all ROM listings on my website:
http://www.vintagecomputers.freeserve.co.uk/hp80/
Regards,
John
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