Serial/Parallel Board (250-4034)       Settings       Faxback Doc. # 5486

Serial/Parallel Adapter (25-4034)* Short Board

There are hardware modification for this board-  3000:017, 4000:008

Standard board, comes with the Tandy 3000/3000HD/4000

This board comes standard with a DB-25 female parallel printer port and
a DB-9 male serial port

(  default configuration  )
E1-E3   selects USA Standard    E1-E2 & E3-E4 International Standard
E6-E7   selects LPT1            E5-E6 selects LPT2
E11-E12 IRQ7 - LPT1             E13-E14 IRQ5 - LPT2
E9-E10  selects COM1            E8-E9   selects COM2
E15-E16 IRQ4 - COM1             E17-E18 IRQ3 - COM2 (Only on Rev. B)

LPT1 port address 378-37F Hex   LPT2 port address 278-27F Hex
COM1 port address 3F8-3FF Hex   COM2 port address 2F8-2FF Hex

Parallel Port (DB-25)
1   Strobe *            10  ACK *         (*) denotes active LOW signal
2   Data Bit 0          11  BUSY
3   Data Bit 1          12  PE
4   Data Bit 2          13  SLCT
5   Data Bit 3          14  AUTO FEED *
6   Data Bit 4          15  ERROR *
7   Data Bit 5          16  INIT *
8   Data Bit 6          17  SLCT IN *
9   Data Bit 7          18-25  GND

Serial Port (DB-9)
    Cable 26-269 converts DB-9 to DB-25
DB-9 Connector       DB-25 Connector
1  Carrier Detect-------------- 8
2  Receive Data---------------- 3
3  Transmit Data--------------- 2
4  Data Terminal Ready--------- 20
5  Signal Ground--------------- 7
6  Data Set Ready-------------- 6
7  Req. To Send---------------- 4
8  Clear To Send--------------- 5
9  Ring Indicate--------------- 22


1. Check the position of the Baud-Rate Generator jumper. It is set at the
   factory to connect pins E1 and E3 for the USA Standard. To set the
   Baud-Rate Generator to the International Standard connect pins E1 and E2
   with the jumper that connected E1 and E3. Then connect pins E3 and E4
   with a second jumper.

2. If you are installing this board in the Tandy 3000, install a jumper on
   E5 and E6 to set the parallel port as Port 2 (LPT2). Install a jumper on
   E8 and E9 to set the serial port as Port 2 (COM2).

3. If you are installing this board in the Tandy 1000 or Tandy 1200,
   install a jumper on E5 and E6 to set the parallel port as Port 2. If a
   serial board is not already installed we suggest that you set the jumper
   on E9 and E10 to set the serial port as Port 1 (COM1).

NOTE: The parallel port can be set as Port 1 (LPT1) by moving the jumper to
connect pins E6 and E7.

NOTE: In order to resolve interrupt conflicts with other boards, disable the
corresponding interrupt on the Rev. B Serial/Parallel board by removing the
jumper from the corresponding interrupt staking pins as follows:

       INTERRUPT    STAKING PINS

          7         E11-E12
          5         E13-E14
          4         E15-E16
          3         E17-E18

Because of this, it is not recommended that 2 Rev. A Serial/Parallel Boards
be used in a computer.

(dkh/jej-05/12/94)