Re: Strange 8255 behavior

From: Mia Magnusson <mia_at_plea.se>
Date: Tue, 12 Jun 2018 17:09:36 +0200
Message-ID: <20180612170936.00005436@plea.se>
Den Sun, 10 Jun 2018 15:44:10 +0200 skrev Michał Pleban
<lists@michau.name>:
> Hello!
> 
> Gerrit Heitsch wrote:
> 
> > How about two 6522 instead? With some clever logic and mapping of
> > the address bits, you might be able to come up with a register map
> > that comes close to what the 6525 has, limiting the amount of
> > change in the code.
> 
> That would mean having one more big chip on the PCB, and therefore the
> PCB would have to be enlarged and redesigned to accomodate it.
> Doeable, but lots of work.

I assume the intention is to replace the 8255 and the 6526 with two
6522's.

> Also, attaching the 65xx chips to the 8088 feels a little bit kludgey
> to me (whit the necessity to generate PHI2, CS and R/W signals with
> correct timing). The 8255 looks better in this role IMHO.

The Intel chips always looks good until you examine the details ;) ;) ;)

-- 
(\_/) Copy the bunny to your mails to help
(O.o) him achieve world domination.
(> <) Come join the dark side.
/_|_\ We have cookies.
Received on 2018-06-12 18:02:36

Archive generated by hypermail 2.2.0.