Re: 6845 replacement

From: Andre Fachat (
Date: 2002-10-06 20:09:25

Hi Ruud,

there are some register incompatibilities with the different 6545/6845 
versions. I think there is a comparision on my 6502 pages 
The timing should be the same, but there are differences in the 
control registers IIRC.


On Thu, Oct 03, 2002 at 12:18:45PM +0200, wrote:
> Hallo allemaal,
> I have been playing with my 8032-SK once again to find a replacement for the
> 6545. I found out that I can replace it with the Hitachi-clone and the
> UM6845 but NOT with the Motorola-ones ???
> I thought it could be a timing problem so I fed the Motorola-6845 with
> various clocks, that is, PHI0, PHI2 etc. etc. The funny thing was that
> whatever I changed, the 6545 and other 6845-clones kept on doing their job.
> Any ideas ???

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