TI-H: External Refrence Clock
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TI-H: External Refrence Clock
I don't know if anyone is interested, but I've found that an external
refrence source can be used to build a perfect working uart or TC.
All you have is an external 555 that generates a pulse, either depending if
you'r using a clock or using serial.
2400bps over a modem is possible, with no graphlink.
All the pulse is used for is to calibrate a delay loop. Kinda like intel's
super hot cookers. When the OS starts up it calibrates a delay loop that
it uses as a refrence. As the processor gets hotter, there is less of a
delay in bus timing and junk like that.
I think mine is 791.7MIPS (300MHz) after running with the case off for a week.
And a 333MHz gets about 860.3MIPS (no case or processor fans). IBM hasn't
released the specs for the 720MHz one. :(
A 350MHz cyrix (RISC based pent) gets a 810.2MIPS rating with the case on
and dual processor fans. :)
I have no processor fans.
Keeping calcs cool would make them run faster, but since everything in the
calc is based on the charge/discharge of a cap, calcs are more extreme.
We could also hook up an external UART to the calc and easily to 300, 600
and if the software is compact 1200bps.
What would be possible is using jumper wires to an internal processor...
The Z80 can be disabled (just paused) and then a second processor could
take over the bus. This would be good for doing things like the ultimate
mem expander or for realy huge math things. A TI-82 could do 3d surface
maping faster than the TI-92.
little tiny 200MHz hitachi RISC processors are about the size of inverters.
I'd like a second processor like that!
I think its totally GAY that a 486/586 will crash with no fan or case.
Man, they get hot.
Hmmm... Maybe since the calc doesn't get hot, its not working hard enough.
:) I know when I push my 300MHz computer to 420MHz it needs a fan, so lets
try making an external variable osc circut and see how high we can crank it
up! :)
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