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The Tandy 1000-TX, introduced during the summer of 1987, includes an on-board
COM port that can be configured as COM1 or COM2.
Unlike the previous COM ports from Tandy, the on-board COM port uses a DB-9
connector arrangement, similar to that used on the IBM-PC(AT) and many other
computers.
Here is the pinouts, with comparable pins on a DB-25 connector
DB-9 Signal I/O Description DB-25
pin pin
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1 DCD I Data Carrier Detect 8
2 RD I Received Data 3
3 SD O Transmit Data 2
4 DTR O Data Terminal Ready 20
5 GND Ground 1+7
6 DSR I Data Set Ready 6
7 RTS O Request to Send 4
8 CTS I Clear to Send 5
9 RI I Ring Indicator 22
9 8 7 6
o o o o
o o o o o
5 4 3 2 1