Re: IEEE-488 adapter for 1541

From: Spiro Trikaliotis <ml-cbmhackers_at_trikaliotis.net>
Date: Sun, 7 Apr 2019 23:02:03 +0200
Message-ID: <20190407210203.ihi46q6ppjf52kkp_at_hermes.local.trikaliotis.net>
Hello Francesco,

* On Sun, Apr 07, 2019 at 11:13:47AM +0200 Francesco Messineo wrote:
 
> Yes, I've read again those threads, so my next question is: what
> changes need to be made to the 2031 firmware to make it write
> compatible with the 4040? Is there a single byte to change to have 10
> bytes gap like the 4040 does?

You have to change the INTRA_SECTOR_GAP:

http://cbmrom.trikaliotis.net/listings/2031-01.lst

You can find it at $F5DB (F5DA: ldx #INTRA_SECTOR_GAP) and $FD1F (FD1E:
ldx #INTRA_SECTOR_GAP).

Other than that, you also have to adjust the ROM checksum (at $FF35 in
the 2031 ROM), or disable the ROM selftest.

Regards,
Spiro.

-- 
Spiro R. Trikaliotis
http://www.trikaliotis.net/
Received on 2020-05-29 21:41:58

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