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From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st
Subject: Re: Mega ST EPROMS
Message-ID: <3206@netmbx.UUCP>
Date: 1 Aug 89 14:43:57 GMT
References: <10407@dasys1.UUCP>
Reply-To: hase@netmbx.UUCP (Hartmut Semken)
Organization: netmbx Public Access Unix, Berlin, West Germany
Lines: 21

In article <10407@dasys1.UUCP> schuster@dasys1.UUCP (Michael Schuster) writes:
>What are the EPROM equivalents for the 1 megabit ROMS used in the
>Mega ST (the ones with two of the six sockets filled). The ROMS say
>"23C1024", but 27C1024 EPROMS have 32 pins, not 28 as these do.
>Are these page-wide ROMS? (27011)?

There are no equivalents.

The ROM's are not page-mode ROM's (011 or 513 style). They just use the
-OE line of the xx512 ROMs as additional adress line.
They have no "spare pin" for Vpp left...

The Mega ST can be modified to use 6*27256 (older Megas have 6 sockets
and the jumpers necessary).

hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
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