Nice Z80+ Operation Manual page 89

Test R:
Simple OOtt, FFtt test on 2K Z8 ROM
Simple OOtt, FFH test on 8K overlay RAM
RAM failed at xxxx
Write protect circuitry fail
Test S: SCOPE TEST
Tests write
Protect circuitry
Error messages
Writes OOH, FFH through the 64K address range of the Z80.
Use to test chip select circuitry and output latches.
CAUTION
You must power
down
system to exit Test S.
Test V:
Scans through all break RAM addresses, displaying all addresses that are set (=0).
D-2.