Re: Help with SX64 User Port?

Date: Wed, 28 Jun 2017 16:40:57 +0200
Message-Id: <>
> On 2017-06-28, at 15:42, smf <> wrote:
>> IFIRC everybody thought the 6522 worked correctly so redesigning a well working stuff would be a pure waste of money. Rumour has it that the hardware bug was discovered too late for the redesign.. at least that's more or less what I seem to recall..
> The issues with the 6522 appear to have been widely known at the time, as was the hardware workround.
> The people working on the drive might not have known, or they may have thought they could work round it in software.
> I don't believe there was a long time between the IEEE interface being removed from the 2031 to discovering it wasn't going to work & then the decision to bitbang with the CPU, rather than using a 6526 or adding the logic gates to prevent the lockup.

I don't stand firmly behind the version I mentioned. I wasn't there where and when it happened. I only repeat the most common rumour, source of which is supposed to be credible (as with all rumours :-)

SD! -

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Received on 2017-06-28 15:02:22

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