Re: Faster IEEE routines

From: Francesco Messineo <>
Date: Thu, 25 May 2017 11:20:38 +0200
Message-ID: <>
On Thu, May 25, 2017 at 4:52 AM, Jim Brain <> wrote:
> On 5/24/2017 4:30 PM, Mike Naberezny wrote:
>> 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:
>> 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.
> Impressive.
> Did you decide on whether to create a reproduction of this unit?  It sounds
> like a cool thing to utilize, but I assume they are scarce.

if a good schematic (and a dump of the TTL prom) is available, I might
like to make such a reproduction (particularly if someone wants to
help condensing most of the glue logic into a cpld).

Frank IZ8DWF

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Received on 2017-05-25 10:00:03

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