ROM Burning
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ROM Burning
At 05:12 AM 11/4/98 +0000, you wrote:
>On 4 Nov 1998 01:08:12 GMT, stl137@aol.com (STL137) wrote:
>
>>Chip making = ROM burning.
>Wrong.
Come on people, use your brain. A ROM cannot be rewritten, unless
its a ROM designed to allow it. The ROM in the newer TI's is designed
for reprogramming. The ROM in the older TI's is not. The ROM contains the
code the calc uses for its operations, and so is nothing more than a chip of
'permanent memory'. The 68000 uses the code to perform the operations in the
TI-89 and 92. The Z80 uses the code in the ROM in the older TI's.
The difference is that the older TI's have a ROM that was pre-programmed
with the code, which cannot be changed, and so is a ROM or Read Only Memory.
An EEPROM serves the same function as a ROM, with the distinct difference in
that it CAN be rewritten with updated code, and so is designated as
Electrically
Erasable Programmable Read Only Memory. You have to have the software to
allow you to rewrite the ROM. But, once its done, the ROM is still Read Only
Memory, and is still a 'container' for the code used by the 68000 to
perform the
operations of the calculator. A FlashROM is a fancy name for an EEPROM.
Its a design difference. FlashROM is basically the same thing as an EEPROM.
So, in my opinion, STL127 has the general idea of it, while Tom is lost in the
woods.
Duane M. Sikkema Jr.
soldevi@usxchange.net
References: