Re: Ultimax questions

From: Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de>
Date: Sun, 20 Oct 2013 14:57:37 +0200
Message-ID: <5263D341.80209@laosinh.s.bawue.de>
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 
them.

  Gerrit



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