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A ROM emulator for the 71B
11-06-2020, 10:58 PM (This post was last modified: 11-06-2020 11:01 PM by Dave Frederickson.)
Post: #5
RE: A ROM emulator for the 71B
(11-06-2020 09:58 PM)rprosperi Wrote:  B. Prepare the image

Use the PTGENC$() command from the CMT EPROM tools to calculate and write the port checkum and also chain all BASIC files (verify GOTOs are legal, etc.). This is done with the target port as follows: PTGENC$(':port(2)')

Not quite.

ROM images have one checksum per 16k, as in TITANCHK, while EPROM images have one checksum per image. The PTGENC$ command, above, comes from the CMT Tools package for burning EPROMS.

Instead one should use ROMCOPY, described by Dave Conklin of Firmware Specialists as "a lex file that computes and places checksums in ROM images."

Dave

Edit: As discussed in other threads, the "EPROM image" will work. It will, however, fail a ROM diagnostic.
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Messages In This Thread
A ROM emulator for the 71B - mfleming - 11-06-2020, 08:52 PM
RE: A ROM emulator for the 71B - rprosperi - 11-06-2020, 09:58 PM
RE: A ROM emulator for the 71B - Dave Frederickson - 11-06-2020 10:58 PM
RE: A ROM emulator for the 71B - KimH - 11-07-2020, 03:49 PM
RE: A ROM emulator for the 71B - KimH - 11-07-2020, 05:18 PM
RE: A ROM emulator for the 71B - rprosperi - 11-07-2020, 07:19 PM
RE: A ROM emulator for the 71B - mfleming - 11-06-2020, 10:57 PM
RE: A ROM emulator for the 71B - twoweims - 11-07-2020, 01:52 AM
RE: A ROM emulator for the 71B - KimH - 11-07-2020, 03:52 PM
RE: A ROM emulator for the 71B - cdmackay - 11-07-2020, 12:45 AM
RE: A ROM emulator for the 71B - mfleming - 11-07-2020, 03:35 AM
RE: A ROM emulator for the 71B - rprosperi - 11-07-2020, 04:06 AM
RE: A ROM emulator for the 71B - mfleming - 11-07-2020, 07:07 PM
RE: A ROM emulator for the 71B - Sukiari - 11-08-2020, 12:07 AM
RE: A ROM emulator for the 71B - Harald - 11-08-2020, 12:06 PM
RE: A ROM emulator for the 71B - mfleming - 11-08-2020, 08:38 PM
RE: A ROM emulator for the 71B - EmmanuelC - 11-08-2020, 09:24 PM
RE: A ROM emulator for the 71B - Harald - 11-08-2020, 11:02 PM
RE: A ROM emulator for the 71B - mfleming - 11-27-2020, 12:00 AM
RE: A ROM emulator for the 71B - KimH - 11-30-2020, 05:08 PM
RE: A ROM emulator for the 71B - mfleming - 11-09-2020, 01:08 AM
RE: A ROM emulator for the 71B - Moggul - 11-10-2020, 08:12 AM
RE: A ROM emulator for the 71B - Sukiari - 11-27-2020, 12:18 AM
RE: A ROM emulator for the 71B - mfleming - 11-27-2020, 01:45 AM
RE: A ROM emulator for the 71B - Harald - 11-27-2020, 06:07 PM
RE: A ROM emulator for the 71B - mfleming - 11-27-2020, 10:58 PM
RE: A ROM emulator for the 71B - Kevin71B - 01-10-2021, 02:20 PM
RE: A ROM emulator for the 71B - mfleming - 01-17-2021, 01:31 AM
RE: A ROM emulator for the 71B - mfleming - 01-17-2021, 03:51 AM
RE: A ROM emulator for the 71B - mfleming - 01-17-2021, 04:35 AM



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