ardent-blue
Experienced Member
- Joined
- Jan 2, 2015
- Messages
- 461
While immersed in the hand to keyboard struggle to attach an IBM 6094-020 LPFK to a PS/2, I called on Michael Brutman to assist. He confirmed the bare minimum of lines needed, but he found a twist. Expect an update when he confirms it. Gist of the story - just because IBM published something only means that AT THAT TIME it was true... Maybe...
http://ps-2.kev009.com/ohland/6094/I...-020_LFPK.html the port info is "correct", but WRONG. Nothing horrible, but IBM figured that it didn't need all the wires.
But anyways, while re-assembling my Model 90, I decided to look at the DB25 serial port. There are only > 15 < pins, all other positions are empty.
The Model 90 was built from '89 to '94-ish. My hunch is that some older equipment in the mid 80s needed the extra lines. So, we have a DB25 serial [15 pins!] and a DE9.
What serial equipment from the mid 80s used a DB25 serial port with 15 pins?
IBM Model 90 DB25 Serial Port, 15 pins
"x" pin
"o" empty
https://advancedrelay.com/downloads/pinouts-for-serial-interfaces.pdf
1 – No pin [IBM says N/C]
2 Transmitted Data TD (“TXD”)
3 Received Data RD (“RXD”)
4 Request to Send RTS
5 Clear to Send CTS
6 DCE Ready—“Data Set Ready” DCR (“DSR”)
7 Signal Ground—“Common Return”
8 Received Line Signal Detector—“Carrier Detect,” “Data Carrier Detect” RLSD
9 = +12 VDC reserved for testing
10 = –12 VDC reserved for testing
11 = Unassigned
12 Data Signal Rate Selector (DCE Source)
13 Secondary Clear to Send SCTS [IBM says N/C]
14 – No pin [IBM says N/C]
15 – No pin [IBM says N/C]
16 – No pin [IBM says N/C]
17 – No pin [IBM says N/C]
18 – No pin [IBM says N/C]
19 – No pin [IBM says N/C]
20 DTE Ready—“Data Terminal Ready” DTR
21 – No pin [IBM says N/C]
22 Ring Indicator RI
23 – No pin [IBM says N/C]
24 Transmitter Signal Element Timing (DTE Source)—“External Clock” [IBM says N/C]
25 – No pin [IBM says N/C]
Note that many applications use only a subset of this pinout: 16 pins—1 through 8, 15, 17, and 20 through 25—for synchronous communication with secondary control and testing; 12 pins—1 through 8, 15, 17, 20, and 22—for ordinary sync applications; 7 pins—2 through 4, 6 through 8, and 20—for asynchronous communication with flow control; or the 4 pins 2, 3, 7, and 20 for bare-bones async applications that use software flow control.
Do any of these devices ring a bell for an old style serial port?
PRINTERS
IBM PagePrinter 3812
IBM LaserPrinter 4019-001
IBM LaserPrinter 4019-E01
Proprinter (R) 4201-001
IBM Proprinter II 4201-002
IBM Proprinter III 4201-003
IBM Proprinter XL 4202-001
IBM Proprinter II XL 4202-002
IBM Proprinter III XL 4202-003
IBM Proprinter X24 4207-001
IBM Proprinter X24E 4207-002
IBM Proprinter XL24 4208-001
IBM Proprinter XL24E 4208-002
IBM Personal PagePrinter 4216-010/D10/031
Quietwriter (R) 5201-001
IBM Quietwriter 5201-002
IBM Quietwriter III 5202-001
Quickwriter (R) 5204-001
IBM PagePrinter 3816
IBM ExecJet Printer 4072
PS/1 (TM) Printer 2205 Model 001
PLOTTERS
IBM 6180 Color Plotter
IBM 6182 Auto Sheet Feed Plotter
IBM 6184 Color Plotter
IBM 6185 Color Plotter
IBM 6186 Color Plotter Model 1,2
IBM 7372 Color Plotter
IBM 7374 Color Plotter
IBM 7375 Color Plotter Model 1,2
http://ps-2.kev009.com/ohland/6094/I...-020_LFPK.html the port info is "correct", but WRONG. Nothing horrible, but IBM figured that it didn't need all the wires.
But anyways, while re-assembling my Model 90, I decided to look at the DB25 serial port. There are only > 15 < pins, all other positions are empty.
The Model 90 was built from '89 to '94-ish. My hunch is that some older equipment in the mid 80s needed the extra lines. So, we have a DB25 serial [15 pins!] and a DE9.
What serial equipment from the mid 80s used a DB25 serial port with 15 pins?
IBM Model 90 DB25 Serial Port, 15 pins
"x" pin
"o" empty
https://advancedrelay.com/downloads/pinouts-for-serial-interfaces.pdf
1 – No pin [IBM says N/C]
2 Transmitted Data TD (“TXD”)
3 Received Data RD (“RXD”)
4 Request to Send RTS
5 Clear to Send CTS
6 DCE Ready—“Data Set Ready” DCR (“DSR”)
7 Signal Ground—“Common Return”
8 Received Line Signal Detector—“Carrier Detect,” “Data Carrier Detect” RLSD
9 = +12 VDC reserved for testing
10 = –12 VDC reserved for testing
11 = Unassigned
12 Data Signal Rate Selector (DCE Source)
13 Secondary Clear to Send SCTS [IBM says N/C]
14 – No pin [IBM says N/C]
15 – No pin [IBM says N/C]
16 – No pin [IBM says N/C]
17 – No pin [IBM says N/C]
18 – No pin [IBM says N/C]
19 – No pin [IBM says N/C]
20 DTE Ready—“Data Terminal Ready” DTR
21 – No pin [IBM says N/C]
22 Ring Indicator RI
23 – No pin [IBM says N/C]
24 Transmitter Signal Element Timing (DTE Source)—“External Clock” [IBM says N/C]
25 – No pin [IBM says N/C]
Note that many applications use only a subset of this pinout: 16 pins—1 through 8, 15, 17, and 20 through 25—for synchronous communication with secondary control and testing; 12 pins—1 through 8, 15, 17, 20, and 22—for ordinary sync applications; 7 pins—2 through 4, 6 through 8, and 20—for asynchronous communication with flow control; or the 4 pins 2, 3, 7, and 20 for bare-bones async applications that use software flow control.
Do any of these devices ring a bell for an old style serial port?
PRINTERS
IBM PagePrinter 3812
IBM LaserPrinter 4019-001
IBM LaserPrinter 4019-E01
Proprinter (R) 4201-001
IBM Proprinter II 4201-002
IBM Proprinter III 4201-003
IBM Proprinter XL 4202-001
IBM Proprinter II XL 4202-002
IBM Proprinter III XL 4202-003
IBM Proprinter X24 4207-001
IBM Proprinter X24E 4207-002
IBM Proprinter XL24 4208-001
IBM Proprinter XL24E 4208-002
IBM Personal PagePrinter 4216-010/D10/031
Quietwriter (R) 5201-001
IBM Quietwriter 5201-002
IBM Quietwriter III 5202-001
Quickwriter (R) 5204-001
IBM PagePrinter 3816
IBM ExecJet Printer 4072
PS/1 (TM) Printer 2205 Model 001
PLOTTERS
IBM 6180 Color Plotter
IBM 6182 Auto Sheet Feed Plotter
IBM 6184 Color Plotter
IBM 6185 Color Plotter
IBM 6186 Color Plotter Model 1,2
IBM 7372 Color Plotter
IBM 7374 Color Plotter
IBM 7375 Color Plotter Model 1,2
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