RE: TI-H: 1MB RAM

To: <ti-hardware@lists.ticalc.org>
Subject: RE: TI-H: 1MB RAM
From: "Javier" <grijalba@cvtci.com.ar>
Date: Sat, 6 Nov 1999 02:21:05 -0300
Reply-To: ti-hardware@lists.ticalc.org


What about the Refresh, what IC are you using ??
Bye
Javier
-----Mensaje original-----
De: Grant Stockly <gussie@stockly.com>
Para: ti-hardware@lists.ticalc.org <ti-hardware@lists.ticalc.org>
Fecha: Viernes 5 de Noviembre de 1999 03:27 a.m.
Asunto: TI-H: 1MB RAM


>
>I'm building a DRAM interface and page switching circut for the TI-83.
>
>I think flash memory expanders are junk.
>
>Any one want to disasm the TI-ROM and patch it for 1MB ram?
>
>For now I'm going to write simple access routines for the extra memory.  In
>ASM, programs can use the extra memory.
>
>1MB is REALLY pushing it for a Z80.  My IBM displaywriter has 512k of DRAM
>(its an orrigional Z80) so it can easily be done.
>
>It uses 8 boards with a total of 512 1k DRAM chips.
>
>I'm using 2 1Mbx4 dram chips.
>

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