The Small Computer Monitor version 0.5.0 is now available.

The program, user guide and tutorial have all been updated. See here for downloads.

Changes include:
Added support for a 68B50 ACIA at I/O address $40
Fixed assembler handling of JP (HL), JP (IX) and JP (IY)
Trapped assembler relative jumps which are too big
Added default console device selection byte in ROM at $0040
Reduced need for hex prefixes in assembler
Many changes and improvements behind the scenes