Re: TI-H: External Refrence Clock
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Re: TI-H: External Refrence Clock
Well, you should be working on a TI-modem.. the wonderful modem could dial
up to an ISP with lovely, elegant software that is quite superb in many ways.
It could dial up, shake hands with the ISP, chat for a bit, send user/pass,
acknowledge login, and boom.. hooked up. WWW, telnet, and email programs
for the TI calcs would be booming by the tons... it is just like a palm
pilot, minus a lot of things like the stylus, yet better than WinCE,
because... There is NO start button!!!
At 04:45 PM 12/20/98 -0900, you wrote:
>
>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! :)
>
>
-Dan
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