Re: Ultimax questions

From: Gerrit Heitsch <>
Date: Sun, 20 Oct 2013 14:57:37 +0200
Message-ID: <>
On 10/20/2013 02:45 PM, Michał Pleban wrote:
> Then, you have two lines from the CIA chip at the expansion port - SP
> and CNT. This is CIA's shift register. So instead of a latch sitting at
> /EXRAM, you can tie a resettable shift register to these lines and latch
> a correct banking value through the shift register from CIA. I haven't
> searched the TTL catalog to see if such chip exists, but probably it
> does; if not, as a last resort you can cascade two 4-bit counters.

Take a look at the 74LS194. 4Bit shift-Register with serial in _and_ 
parallel load and resettable. Should cover what you need if you use 2 of 


       Message was sent through the cbm-hackers mailing list
Received on 2013-10-20 13:01:57

Archive generated by hypermail 2.2.0.