ncoplin_at_orbeng.com
Date: 2003-09-19 05:32:31
Hi All,
>> Can someone confirm that the 1571 drive is a 2MHz unit and that the MPU,
>> VIAs and CIA are all rated for 2MHz operation. The VIA chips in my unit
are
>> marked 6522P2 rather than 6522A which is what I would have expected....
>>
>I do remember one of the VIA lines (or was it a cia line?) that could
switch
>between 1mhz and 2mhz. Find a ref guide and read up :)
So I've found this which says that the chips need to be 2MHz
http://www.devili.iki.fi/Computers/Commodore/C1571/Service_Manual/Page_17.ht
ml
But it also identifies the chips as CMOS types. Would CMOS/NMOS make a
difference?
- Nick
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