Re: basic1-patch from vice in a real PET

From: André Fachat <afachat_at_gmx.de>
Date: Thu, 08 Feb 2018 22:51:43 +0100
Message-ID: <16177671db0.27b9.b4d1f2b66006003a6acd9b1a7b71c3b1@gmx.de>
Am 8. Februar 2018 22:39:16 schrieb Mia Magnusson <mia@plea.se>:

> Den Thu, 8 Feb 2018 20:34:58 +0100 skrev Francesco Messineo
> <francesco.messineo@gmail.com>:
>> No PET, as far as I know, has ROM in E8-EF, that's where the I/O
>> chips "live" (6520s, 6522, 6545 on CRTC versions).
>> E0-E7 2K space is where the "editor" ROM is mapped.
>
> According to this memory map, on some PETs only E800-E8FF is decoded
> for I/O and E900-EFFF can be used for 1.75K rom.

This only true for newer PETs that allowed to put nationalized Editor ROM 
code there.

The PET 2001 decodes ROM in chunks of 2k, E900-EFFF is not decoded 
separately here

André
> So there seems to be PETs with ROM in this area.
>
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Received on 2018-02-08 22:02:05

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