wlevak_at_cyberspace.org
Date: 2003-09-19 05:42:36
The major chips are:
6502A
65C22A
8520
6526A
All are 2MHz chips.
The 1571 can run at 2 MHZ (1571 mode) or 1 MHz (1541 mode). The clock
speed is controlled by the 64H156 at location U6.
On Fri, 19 Sep 2003 jbevren@starbase.globalpc.net wrote:
> 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 :)
>
> -David
>
> On Fri, 19 Sep 2003 ncoplin@orbeng.com wrote:
>
> > 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....
> >
> > - Nick
> >
> > =========================================
> >
> >
> >
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > Your Engineering Solutions Provider
> > http://www.orbeng.com.au/orbital/engineeringServices/engServices.htm
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > PLEASE TAKE NOTE:
> >
> > The contents of this email (including any attachments) may be
> > privileged and confidential. Any unauthorised use of the contents
> > is expressly prohibited. If you have received this email in error,
> > please advise us immediately (you can contact us by telephone
> > on +61 8 9441 2311 by reverse charge) and then permanently
> > delete this email together with any attachments. We appreciate
> > your co-operation.
> >
> > Whilst Orbital endeavours to take reasonable care to ensure
> > that this email and any attachments are free from viruses or other
> > defects, Orbital does not represent or warrant that such is explicitly
> > the case
> >
> > (C) 2003: Orbital Engine Company (Australia) PTY LTD and its
> > affiliates
> >
> >
>
>
> Message was sent through the cbm-hackers mailing list
>
Message was sent through the cbm-hackers mailing list
Archive generated by hypermail pre-2.1.8.