You can configure the S1990 by placing a pull-up at a certain pin.
If you put an extra 256 kbyte in your ST to make it 512 kbyte, you
have to add this pull-up to configure the S1990 for 512 kbyte.
I have done this with my ST too!!!
The reason of this difference in number of bits that are driven high is
this configuration.
BUT, I don't know for sure of this problem exists with 256 kbyte.
Someone could check this.
Greetings from Erik Maas
----------
From: Maarten ter Huurne
Sent: Wednesday, May 27, 1998 1:34 PM
To: [EMAIL PROTECTED]
Subject: RE: Looking for Ram (turbo-R with S1990)
At 10:48 AM 5/27/98 +0200, you wrote:
>I could be wrong, but I think with a 256 kbyte turbo-R ST even bit 4 will
>be high.
It's the same S1990 IC, so why should there be a difference in the number
of bits that are fixed high?
Also, Mark Zellenrath (do you still read this list?) has 512K internally in
his ST and has never complained about software that stopped working after
the memory expansion.
Bye,
Maarten
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