Re: ROM versions

>> This second board as a different ROM version (H/A8) athough the first
>> one is D/A8.
>
> The "H" is the CPU board ROM version. The "A8" is the I/O board ROM
> version.
>
> I believe Rev. D is the first version released to support the
> single 3.5"
> floppy drive configuration (ie. the Lisa 2). Earlier revisions were
> for the
> dual 5" "twiggy" drive configuration (ie. the Lisa 1).
>
> Rev. H is the last version that will run the Lisa Office System.
>
> After that, there is a 3A version (which is part of the Macintosh
> XL screen
> modification kit). This changes the screen resolution to provide
> square
> pixels so that Macintosh software looks more like a Macintosh. With
> the 3A
> ROM version installed you cannot run the Lisa Office System.
>
> The various MacWorks Plus and MacWorks Plus II versions work with
> both 3A
> and H ROM versions (and possibly D-G too).
>
> MacWorks XL 3.0 comes in two varieties -- you have to use the one that
> corresponds to the square pixel rev. 3A ROM if that is installed.
>
>> Is there any real differences ? Which one is better ?
>> When started with the H/A8 board, the Lisa will only ask to boot on
>> drive 2, although it let choose Drive 1 (which does'nt exist ?) and
>> Drive 2.
>
> The "ghost of Floppy 1" in the "Startup From" menu is, I think the
> only
> obvious difference. I don't recall off-hand what other "bug fixes"
> there
> are. I would suggest using Rev H or 3A.
>
> Maybe someone else has a list of the ROM differences handy?
>
> James
>
> James MacPhail "Think not of engineering as art,
> uo957_at_email.domain.hidden but of art as engineering"
> Sigma Seven Systems Ltd.
> james_at_email.domain.hidden <http://SigmaSevenSystems.com>
>
>
>
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