Looking at the Landmark diag ROM manual (http://www.minuszerodegrees.net/supersoft_lan … rs%20Manual.pdf page 26) it says:
Note: Just as in the level 0 interrupt test, passing this test also requires the proper operation of other system board devices such as the 8259 Interrupt Controller, the 8288 Bus Controller (to process interrupts), and the 8255 Parallel Peripheral Interface controller (to receive scan codes from the Keyboard Controller).
I tried swapping each chip from another (possibly broken) board and I'm still getting the keyboard controller error but I'm wondering if I need to source another XT keyboard.
A Sound Test for as many games as I can find at SNDTST.com