Re: lisa 2 startup problems

Well done. Good to see there is some progress.

Terry (Tez)

On Mon, Jan 7, 2013 at 2:26 PM, James MacPhail <gg__at_email.domain.hidden> wrote:
>
>> I can now start the Lisa 2/5.
>
>
> Congratulations!
>
>
>> Any Ideas about the source of the problem would be appreciated.
>
>
>> It is weird since I get at booting the Rom version different, sometimes it
>> is the same but sometimes different until now I got:
>> 3A/48
>> 3A/88
>> 3A/60
>> 3A/8F
>> 3A/FF
>
>
> The second part of the ROM version is the version of the I/O Board ROM. This
> is read by the 68000 CPU from the memory (on the I/O Board) which is shared
> with the 6504.
>
> It is possible that the value is truly incorrect and varying, perhaps due to
> the 6504 not running properly (even if the 6504 is working, it may not be
> reading the EPROM, or the shared memory might not be working), or the CPU
> board might not be accessing the I/O board properly.
>
>> the Lisa Lite adapter
>
>
> Malfunction of the Lite Adapter would only affect actual operation of the
> floppy.
>
>
>> I cannot test the ROM (341-8003), should this ROM work with the IO
>> Board from the 2/10?
>
>
> The ROM is specific to the type of I/O Board. The 2/5 I/O Board needs a
> version A8 Lisa 2/5 ROM, and the 2/10 I/O Board needs a version 88 Lisa 2/10
> ROM. This is independent of the CPU Board ROM, which can be H, or 3A, or
> various others. For more info, see:
>
> http://lisafaq.sunder.net/lisafaq-hw-rom_versions.html
>
> You can put the 2/10 I/O Board in the 2/5, but the floppy will not work
> unless you modify the Lite Adapter. See:
>
> http://lisafaq.sunder.net/lisafaq-hw-io_substitution.html
>
> I suggest NOT modifying the Lite Adapter, and just see if the machine works
> properly with the 2/10 I/O Board. If the problem persists, then it implies
> an issue between the CPU and I/O Board. If the problem goes away, then it
> implies an issue with the 2/5 I/O Board.
>
> Good luck!
>
>
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