🚀 go-pugleaf

In article <643@becker.UUCP> douglee@becker.UUCP (Doug Lee) writes:

>You will have a problem running the Francis board this fast unless you get
>REAL fast ram chips. Even then it might not work. The problem is that above
>16 Mhz or so, you have to insert extra wait states (wasted clock cycles)
>because the ram cannot keep up with the CPU. I don't yet have my own Francis,
>but according to Brad Fowles, the designer, the system is faster running at
>16 Mhz with 1 wait state ram than at 20 with 2 wait states. You MAY get it to
>work at 20 with one wait state as I think some people have had limited success
>at this. 
>
><<<Doug>>>
>douglee@becker

I have been running my Frances/Lucas board at 20 MHz with one wait state for
a while now. The crucial factors in getting this to work for me was not 
the U9 chip -- they were one, trying different clocks until I found one that
worked, and two, always letting the computer warm up for at least half an hour
before attempting to do anything with it. Actually, I simply don't turn it off
now. The U9 chip I used is a TI SN7474, the clock is a MTRON make. Mind you,
I don't have a bus terminator and I don't have anything on the expansion bus.

Tim.

P.S. I'm using Siemens 70 nsec. memory chips.

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timg@ziebmef.UUCP		{uunet!mnetor!lsuc,utgpu}!ncrcan!ziebmef!timg

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