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Created page with "The Amstrad CSD was a machine that was in-store to demonstrate the hardware of the Amstrad plus. It had a system cartridge which contained a menu, and could hold a furthur 12 ca..."
The Amstrad CSD was a machine that was in-store to demonstrate the hardware of the Amstrad plus.
It had a system cartridge which contained a menu, and could hold a furthur 12 cartridges.
It has additional hardware to allow switching of cartridges.
==Technical==
The information was derived from the software. It is not completely accurate.
Lots of information is not known at this time.
It uses ports fbe0-fbe3. The exact decoding of these ports is unknown.
fbe0 is read only it seems
bits 7..4 seem to be related to the dip switches on the CSD
bit 7 seems to be fixed to GND/0v.
bit 6,5 is the timer value. It is the time allowed between choosing next cartridge to play.
bit 6, bit 5
off off = 8 1 1
off on = 16 1 0
on off = 24 0 1
on on = 32 0 0
bit 4 seems to be timer on/off for time limited play.
fbe0 bits 3..0 are defined by the dial
bit 3 is ignored.
0 = forever?
1 = 8s,
2 = 56s
fbe2 is read only it seems
bits 7..3 are the currently selected cartridge
bits 3..0 ???
fbe1 is writeable
bits 7,6: ???
bits 5..0: are cartridge number??
fbe3 is writeable:
bits 7..4: are cartridge number
bits 3..0: ???
It had a system cartridge which contained a menu, and could hold a furthur 12 cartridges.
It has additional hardware to allow switching of cartridges.
==Technical==
The information was derived from the software. It is not completely accurate.
Lots of information is not known at this time.
It uses ports fbe0-fbe3. The exact decoding of these ports is unknown.
fbe0 is read only it seems
bits 7..4 seem to be related to the dip switches on the CSD
bit 7 seems to be fixed to GND/0v.
bit 6,5 is the timer value. It is the time allowed between choosing next cartridge to play.
bit 6, bit 5
off off = 8 1 1
off on = 16 1 0
on off = 24 0 1
on on = 32 0 0
bit 4 seems to be timer on/off for time limited play.
fbe0 bits 3..0 are defined by the dial
bit 3 is ignored.
0 = forever?
1 = 8s,
2 = 56s
fbe2 is read only it seems
bits 7..3 are the currently selected cartridge
bits 3..0 ???
fbe1 is writeable
bits 7,6: ???
bits 5..0: are cartridge number??
fbe3 is writeable:
bits 7..4: are cartridge number
bits 3..0: ???
