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


[Prev][Next][Index][Thread]

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



just to make sure you are aware, allot of programs on the 68k calcs take advantage of the ram layout... by adding 0x40000 (256k) to pointers, some protections built-in by TI can be bypassed. Kernels do this as well as ppg (compressed) programs and event hooks...
there is memory mapped io too...
 
http://d188.ryd.student.liu.se/ti89/download.php?file=http://m101.ryd.student.liu.se/J89hw.txt

Regards,
Greg Dietsche
GForce Programming:   http://calc.gregd.org
Detached Solutions:      http://www.detachedsolutions.com

----- Original Message -----
From: Shyam D.
To: ti-hardware@lists.ticalc.org
Sent: Wednesday, February 26, 2003 5:43 PM
Subject: [TI-H] Re: TI-89 HW2 overclocking

Yah, its 2 128k chips. You shouldn't use more memory then the m6800 in
the 89 can address since that's just a waste of money. Does the Ti-89
use all of its Addressing space?
--
S.D.


-----Original Message-----
From: ti-hardware-bounce@lists.ticalc.org
[mailto:ti-hardware-bounce@lists.ticalc.org] On Behalf Of B.A. Baracus
Sent: Wednesday, February 26, 2003 3:15 PM
To: ti-hardware@lists.ticalc.org
Subject: [TI-H] Re: TI-89 HW2 overclocking

On Wed, 26 Feb 2003 20:05:51 +0100, Olle Hedman <alh@home.se> wrote:
> Another thing to do if you anyway are going into the calc, and
replacing
> the ram chip, is to cram in a 2MB chip instead of the 256K one.
> or atleast 512 or something.
> the memory area between 0 and 0x1fffff is reserved for ram, but only 0
-
> 0x3ffff is used, so it should be fairly simple.
> Maybe find a chip that is as pin compatible as possible, and bend up
the
> pins not compatible and solder short wires from these.
> I don't remember, is the ram repeated in this 2M area? if so, its even

> better, no need to change the chip select wiring, just use the old
one.
> just add some more wires for the extra adress pins.

instead of the 256K one? but the 89 uses two 128K chips...


--
B.A. Baracus


Follow-Ups: References: