Re: VIA shift register

From: Pasi 'A1bert' Ojala <a1bert_at_iki.fi>
Date: Fri, 11 Jan 2019 14:49:14 +0200
Message-ID: <005950bf-ac83-ffd8-73bc-bdfa8a9e0388@iki.fi>
On 10.01.2019 22:32, Francesco Messineo wrote:
>
> I would not modify a C128 as you suggest. I'd try lifting U8P9 and
> just use the same routines used in C128 mode (of course they would
> need to be copied somewhere in the C64 RAM first).
The MMU is not visible in C64 mode, thus you can't change the direction 
even if you force the "c128 mode".

Back in the day I studied the C128 routines to get the burst mode to 
work with PuZip and GunZip. The burst byte has to be sent at the right 
moment to get the burst byte response and thus detect that the device is 
burst-capable. I don't remember anymore how much of the KERNEL routines 
needed to be changes, but the source code of PuZip will tell us. Well, 
not that much, but some anyway.

-Pasi
Received on 2019-01-11 14:00:07

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