Spectaculator specific extensions to the Z80 snapshot format

Spectaculator loads and saves customised versions of the z80 snapshot format. These customisations allow the z80 format to support more advanced features whilst maintaining backward compatibility with existing emulators.

Support for +2/+2A snapshots

If bit 7 of byte 37 is set, this modifies the value of the hardware field (for both v2 and v3 snapshots) such that:

• Any valid 48k identifier should be taken as 16k

• Any valid 128k identifier should be taken as +2

• Any valid +3 identifier (7 or 8) should be taken as +2A

Support for Fuller Box / AY sound in 48k mode

Spectaculator recognises xzx's extension of setting bit 2 of byte 37 to specify AY sound in 48k mode. In addition, if this and also bit 6 is set, this specifies Fuller Box emulation.