TI-H: 1MB RAM

To: ti-hardware@lists.ticalc.org
Subject: TI-H: 1MB RAM
From: Grant Stockly <gussie@stockly.com>
Date: Thu, 4 Nov 1999 21:40:06 -0900
Reply-To: ti-hardware@lists.ticalc.org


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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