Lower Case Modification
I have not tested this yet. An additional character RAM has been added at Z46. The machine seems really designed to have this IC because the modification seems quite simple. This is covered by Technical bulletin I:35.
The lower case version of scripsit “SCRIPSIT/LC” demonstrates it.
Signal Terminations
As per Technical Bulletin I:12 (source unknown):
Cassette Modification
XRX-111 modification as per Technical Bulletin I:15 (source unknown):
Reset Switch
The reset switch just parallels the existing reset switch. I added a series connector so that the lid could be separated.
Top cover connections
The mods add an LED (turbo), reset button, and joystick mod. This makes it impossible to remove the cover from the main board. I’ve added in-line connectors so it can be detached.