+Since IBM had patented their keyboard design, +Amstrad developed an entirely different keyboard. +
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The +Amstrad keyboard +is entirely incompatible with XT and AT keyboards, and can be used only +on an Amstrad; conversely, no other keyboard will work on an older Amstrad. +This keyboard has a Del key on the keypad, and both Del-> and Del<- keys +above the Enter key. The Del-> key has scancode 70. +Left of the Enter key a PrtSc/* key. +There is an additional Enter key with scancode 74. +It is possible to connect a mouse and/or joystick to the keyboard, +and then these devices also yield scancodes: +77 (joystick button 1), 78 (joystick button 2), +79 (joystick right), 7a (joystick left), +7b (joystick up), 7c (joystick down), +7d (mouse right), 7e (mouse left). +
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John Elliott adds: +
The above only mentions the PC1512/PC1640 style of keyboard. +Later Amstrad XTs (PPC512, PPC640, PC20, PC200, PC2086, PC3086) used a +102-key keyboard with the same layout and scancodes as a normal 102-key XT +keyboard. This design is not only incompatible with normal XT and AT +keyboards, it's also incompatible with the PC1512 keyboard. The joystick +socket is no longer present, but mouse button clicks are still handled by +the keyboard, with the same scancodes 7d (right button) and +7e (left button). +
On the PPC512, PPC640, PC20 and PC200, the keyboard is in the same box as +the motherboard, and is connected directly to it by ribbon cable. +
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