Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!snorkelwacker!spdcc!merk!xylogics!cloud9!jjmhome!m2c!wpi!greyelf
From: greyelf@wpi.wpi.edu (Michael J Pender)
Newsgroups: comp.sys.apple
Subject: Re: 10 mhz chips
Message-ID: <5841@wpi.wpi.edu>
Date: 28 Nov 89 02:51:42 GMT
References: <2473.cortland.info-apple@pro-houston> <36403@apple.Apple.COM> <4518@ncsuvx.ncsu.edu>
Reply-To: greyelf@wpi.wpi.edu (Michael J Pender)
Organization: Worcester Polytechnic Institute, Worcester, MA. USA
Lines: 15

In article <4518@ncsuvx.ncsu.edu> rnf@shumv1.ncsu.edu (Rick Fincher) writes:
>In article <36403@apple.Apple.COM> mattd@Apple.COM (Matt Deatherage) writes:
>>>
>>Faster video is one thing, but faster I/O could very well mean that none of the
>Why not have both?  Maybe you could have the existing slots and a few faster
>ones or perhaps a control panel setting that would let you set slots to fast
>or slow (normal in Control Panel parlance!).  Then the user could configure
>the machine depending on wether a fast or slow card is being used.

It wouldn't allow old cards to work if they had to have the speed
coded in ROM.  Having the machine just slow down for accesses to
the hardware page is easy enough, use some 74121s as timer delays
to impose wait states using the rdy line.  Then the selection of the
74121s could easily be controlled from the control panel by gating
the address request with the state of a flip flop.