Re: VC1541 with fast serial?

From: André Fachat <afachat_at_gmx.de>
Date: Tue, 27 Aug 2019 00:16:50 +0200
Message-ID: <16cd000d050.27ff.b4d1f2b66006003a6acd9b1a7b71c3b1_at_gmx.de>
Am 27. August 2019 00:05:07 schrieb silverdr_at_wfmh.org.pl:

>> On 2019-08-26, at 23:24, Mia Magnusson <mia_at_plea.se> wrote:
>>
>>> It might be easier to do what Commodore has done in the 1570/71 and
>>> use an additional 6526 just for the shift register. Then borrow the
>>> code from the 1571.
>>
>> That would most likely be the solution that requires the least amount
>> of work to get it up and running.
>>
>> Captain Obvious says that the con is of course that it needs a CIA. For
>> a one-off or general DIY project that might not be a problem, but if
>> someone were to order a bunch of PCBs and sell either as a complete kit
>> or ready-built thing it might be troublesome to source CIAs.
>
> Pulling a CIA's shift register off a PLD would be Captain Obvious next
> advice ;-)

And then you need to add logic to put this CPLD somewhere into the CPU
address space. Ok that probably goes into the CPLD as well :-)
You also need to make sure you have the right output drivers.

André
>
Received on 2020-05-29 22:57:25

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