Editing IBM 3270 PC (section)

=== Keyboard Adapter Card ===

* Intercepts the '''122-key IBM 5271 Keyboard Element''' scancodes and translates them to XT scancodes.
* Two variants:
:: '''Simple''' (ROM '''6323581''')
:: '''Complicated''' (ROM '''6323582''') — adds NMI button and serial port.
* '''Critical: this card holds the video BIOS''' for the 3270 PC Display Adapter — the video cards do not work without the keyboard adapter card installed.<ref name="seasip">John Elliott, [http://www.seasip.info/VintagePC/5271.html The IBM 5271 (aka 3270 PC)], seasip.info. A community technical reference built from a working machine: the card complement and what each card does, the video BIOS living in the keyboard controller ROM (part 6323581 for the "simple" controller and 6323582 for the "complicated" one), the error codes 3201, 3202, 3203 and 2801, the 5272 display timings, and the statement that the case, motherboard, drives and power supply are all identical or very similar to the XT.</ref>
* On Models 024 and 026, which drive the 3295 Plasma Monitor, IBM fits a '''Plasma Keyboard Adapter''' in place of the standard one.<ref name="sim" />