5 Feb
2012
5 Feb
'12
8:15 p.m.
On 2012 Feb 5, at 11:05 AM, Tony Duell wrote:
It's not new information. In the message you replied to earlier Chuck
had specified the IC in question had GND and ?15V on it. You chopped
that part in your reply. He had also stated at the beginning of the
thread there were only two ICs on the board and the other one
appeared to be a TMS1000 with -15V.
On 4 Feb 2012
at 20:17, Tony Duell wrote:
You are now giving me additional facts, from which I agree that the
unknown IC is not a TTL device. But your original somment that the
board
used -5V and -15V power lines does not IMHO preclude the use of TTL
on it. I've not seen the board but I don;t think I
can say from what you've
told us that there can't be any TTL on the board.
-15V is present on both ICs. There's nothing else on the main board
in the way of ICs. The capacitive touch panel and clock are on a
separate PCB--I haven't taken that assembly apart yet. Pin 1 of the
TMS1000 connects to pin 6 of the mystery IC. Otherwise there are no
direct connects between the two. The -5V goes
to 2 headers for connection to the display/touch panel.
Although I haven't disassembled that assembly, I suspect that it's
used for the LEDs and clock displays. Perhaps some TTL is on that
board. But the -5 connects to no other component on the MCU board.
Doesn't sound like TTL to me.
Agreed. Doesn't sound like any common display driver chip either.