keychron_qmk_firmware/keyboards/converter/ibm_5291

IBM 5291 keyboard converter

IBM 5291

A converter for the eponymous keyboard.

Keyboard Maintainer: Listofoptions
Hardware Supported: IBM 5291, Teensy 2.0

Make example for this keyboard (after setting up your build environment):

make converter/ibm_5291:default

See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.

The pinout is as follows:

IBM−5291−Cable to Pinhead−14

pin	description
1	GND
2	NC
3	GND
4	GN)
5	+5V
6	D0
7	D1
8	D2
9	D3
10	D4
11	D5
12	D6
13	Strobe
14	Out

The pins on this connector are organized

IBM−5291−2 Cable with DB15M connector

pin	description
1,2,3	GND
4	+5V
5	D0
6	D1
7	D2
8	D3
9	D4
10	D5
11	D6
12	Strobe
13	Out
14	PE
15	NC

The above connector is actually numbered so it should be easier to determine where the needed connections are.

To connect to the teensy, the following are pins are needed (if you should choose not set your own):

• PB0 -> PB6 are connected to D0 -> D6
• +5V is connected to the corresponding teensy pin
• gnd is as well, only one of the gnd pins needs to be connected though.
• strobe is connected to pin PD1
• data is connected to PD0
• PE does not need to be connected to anything, but it could also be connected to gnd

sources: http://www.retrocomputing.eu/documents/5291_MaintenanceLibrary.pdf