RE: TI-H: 1MB RAM
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RE: TI-H: 1MB RAM
No IC, a circut. I'm still entering it into protel. Its from a vintage
Z80 book.
Grant
>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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