IBM PCjr notes

Here are some notes on my work restoring and working with an old IBM PCjr.

Keyboard issues

Some programs don’t do well with the IBM PCjr keyboard and how it handles / signals key presses via INT 0x9. This TSR/SYS driver will correctly compensate for this. Without this the EDIT/QBASIC programs with later DOS versions don’t run correctly, and apparently neither does QUICKBASIC.