Re: TI-H: New gray link.
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Re: TI-H: New gray link.
I bought the link cable from Staples last week. So, the hacker that I am,
I ran a terminal program (Procom), connected my calc, through the link
cable, to com 1. I then tried to send something from the calc to the
terminal. I managed to display the packet from the calc on the screen.
The packet was in raw ASCII format. When converted to hex, it was the same
as in the Protocol Docs for the TI. I had the terminal set to monitor mode,
9600,N,8,1. All hardware handshaking is off. So then, I connected a
protocol analyzer between my computer running TI's link program amd my calc.
I sent a group file of everything to computer. The protocol analyzer was
set to auto setup. I was able to see every packet sent between the two.
The protocol analyzer returned the following setup:
Protocol: Charater
Code: ASCII 8
9600 bps
Party: none
Async: 1
LSB first
I opened every pin connection in the link except for the following pin numbers:
1: shield ground (may not need this)
2: TX
3: RX
7: Signal ground
20: DTR
*****The link cable is being power from the TX line. I traced it through a
diode, caps, then to a small voltage regulator and then to the VCC pin on
the microcontroller.***** This is wrong.
I've now traced the power from pins 20 and 6. Pins 20 and 6 are connected
via the circuit card. The voltage input from the serial port is ~ +10vdc.
The circuit draws about 4 ma of current. 20 and 6 then go to the voltage
regulator, drops to +5vdc.
I was able to communicate between computer and TI85, via a terminal program
(Procom) on the computer and the Talk85 program on my calc. There were some
problems on the calc with character translation, but other than that it
worked.
Anyone want to write a terminal program for the 85? The Talk85 program
would be a go start.