[TI-H] Re: TI-89 HW2 overclocking

[TI-H] Re: TI-89 HW2 overclocking

• To: ti-hardware@lists.ticalc.org
• Subject: [TI-H] Re: TI-89 HW2 overclocking
• From: Olle Hedman <alh@home.se>
• Date: Fri, 28 Feb 2003 14:45:57 +0100
• In-Reply-To: <3E5DF821.1070703@home.se>
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Olle Hedman wrote:

>
> Ok, then you add two chips...  or, replace them with a single is 
> probably the simplest.
> 68000 can adress 16M of memory, so no problem there. the ti89 uses 
> only a small part, 2M for flash, 256K for ram, and a few words for I/O.
> And as I said, there is already room in the memorymap for extra ram. 
> Probably a design desicion from the designers of the TI89, so they 
> later could choose how much ram to put in it.

Correction on that.
The two chips are low byte and high byte on the bus. The 68k has 16 bit 
bus, so you need two 8 bit memory chips. all even byte accesses go to 
one chip, all odd to the other.
So the easiest would be to change both chips.
I'm not saying this would be easy, but it certainly is possible to do.

--Olle

• [TI-H] Re: TI-89 HW2 overclocking
• From: "Shyam D." <XXMegamixmanXX@attbi.com>
• [TI-H] Re: TI-89 HW2 overclocking
• From: "Greg Dietsche" <Gregory.Dietsche@cuw.edu>
• [TI-H] Re: TI-89 HW2 overclocking
• From: Olle Hedman <alh@home.se>

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