Re: Faster IEEE routines

From: Mike Naberezny <mike_at_naberezny.com>
Date: Wed, 24 May 2017 14:30:25 -0700
Message-ID: <47c3a663-061f-3110-43f0-e0e927ff827c@naberezny.com>
On 5/24/17 2:02 PM, Jim Brain wrote:
> How did you resolve the 6/2 versus 8/0 or 0/8 issue as part of the conversion, 
> or did that issue force the effort to stop?

I did get the SoftBox running with the CBM-II machines.  I came up with a hack 
for the transceiver issue, which I explained here:

https://github.com/mnaberez/softbox/blob/9957d6d85172937fec3eee97fdb46429e4e959cd/cbm/cbm2.asm#L233-L309

It depends on careful timing to know when the SoftBox is in a certain state. 
This is possible because the SoftBox doesn't use interrupts.  I don't like 
this solution but it does allow the unmodified SoftBox to be used with the 
CBM-II machines.  It would be better to modify the SoftBox so its protocol is 
compatible with the 75160/75161.  I also disassembled the SoftBox BIOS so I 
might make that change at some point.

Regards,
Mike

-- 
Mike Naberezny (mike@naberezny.com) http://6502.org


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Received on 2017-05-24 22:01:22

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