Sinclair ZX Spectrum Joystick Schematics

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Title		Paper	Size	Description
2-chip Joystick	diagram	2912x2064 A5L	44K	2-chip Kempston joystick interface. Uses just a single 74LS366 hex buffer, a single 74LS32 quad-OR, a Spectrum edge connector and a 9D plug. This type of joystick interface fully decodes IN 31, so does not interfere with interupts in IM2. The addition of a 35p multiple OR gate decodes ~IORQ, ~RD, A7, A6 and A5 to correctly respond to IN 31.
1-chip Joystick	diagram	2912x2056 A5L	44K	1-chip Kempston joystick interface. Uses just a single 74LS365 hex buffer, a Spectrum edge connector and a 9D plug. This is the type of joystick interface that causes interupt problems in IM2 as it only decodes ~IORQ and A5, so any I/O access with A5=0 reads the joystick. So, an interupt acknowledge with ~IORQ=0, but ~RD=1 and ~WR=1 accesses the joystick.
KbdJoy1.gif KbdJoy.gif KbdJoy.jpg ASCKbd.jpg	diagram diagram picture picture	916x1000 A5P	61K 30K 41K 52K	ASCII keyboard on port &FD/&F9 and Kempston joystick on port &1F.
KbdPrnJoy1.gif KbdPrnJoy.gif	diagram diagram		65K 84K	ASCII keyboard on port &FD/&F9, Centronics printer on port &FB, Kempston joystick on port &1F.
PrintJoy.gif	diagram		51K	Centronics printer on port &FB, Kempston joystick on port &1F.

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Authored by J.G.Harston - Last update: 10-Mar-2016