January 17, 1998
We FINALLY wired up our second TI92. You can find pictures of the process here. Today we tried to test the I/O port, but it crashed every time we turned the external hardware on. We have a few ideas left that we are going to try, mostly chnges in the hardware of the I/O port.
The worst thing that happened today was we fried the CPU of the second TI92. We accidently attached a wire to the ROM's Vcc, and decided to leave it attached because we might want it later. Well this wire touched ground and shorted the CPU. Something smelled hot, and the TI would not turn on again. So, hoping that the entire CPU was not destroyed, we soldered the other end of the ROM's Vcc wire to the top of JP7 (which is directly attached to positive power) and it worked again. So this TI is running with a fried CPU and a ROM that is running straight from battery power (which is sure to be hard on the ROM and use batteries faster).
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January 18, 1998
Today is the day that proves that Marvin can be a reality. We successfully wrote to and read from the external I/O port. This is a breakthrough in all of TI hacking! This can be used not only for Marvin, but extremely high speed data transfer between TI92's and other I/O port applications. Check the pictures of the TI92 turning lights on and off through SOFTWARE (look at the 4 LED's in the middle of the picture...). These lights represent different bits at 0x400000 on the data bus.
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January 21, 1998
We were able to get the TI92 to operate a radio controlled car. Only forward and backwards were implimented because we did not have enough relays to get steering working as well...
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January 26, 1998
We have completed a few more steps toward our prototype, but because of the competition, we are not going to post what we have done on the internet. This will be the last public update on what we have done until after the competition.
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