Changes

Image:KempstonMouseInterfaceFrontKempstonMouseInterfaceTop.jpg|Back (showing mouse connector) - faces away from CPCImage:KempstonMouseInterfaceBackKempstonMouseInterfaceBottom.jpg|Front (showing edge connector) - faces CPC

Image:KempstonMouseInterfaceBelowKempstonMouseInterfaceUnder.jpg|From belowImage:KempstonMousePCBTop.jpg|PCB (joystick connector side)Image:KempstonMousePCBUnder.jpg|PCB (edge connector side)

Image:KempstonMouseBelowKempstonMouseUnder.jpg|Kempston Mouse (under)

The mouse that comes with the interface has 2 buttons. It is a ball mouse. Unknown brand.Green label reads "Q.C. PASSED. MADE IN TAIWAN. R. O. C.". Mouse has 9-pin DIN like a joystick. Unknown if compatible with Atari ST or Amiga or neither.

Port The schematics and PCB are 90% the same as the Spectrum's. They differ in the port decoding . NOTE: * Counters are reset to 0 at power on. * Counters are NOT reset to 0 when using bus reset (reset switch) === I/O decoding === Decoding seems to be confirmed(some testing to confirm this):  I/O port for X position is decoded as xxxx x0x1 xxx0 xxx0 (FBEE is normally used) I/O port for Y position is decoded as xxxx x0x1 xxx0 xxx1 (FBEF is normally used) I/O port for Buttons is decoded as xxxx x0x0 xxx0 xxxx (FAEF is normally used) Confirmed connected:A10, A0, A4, A8.Number ==== Movement ====  Port FBEEh READ: Kempston Mouse 8 bit X position (left: -ve, right: +ve) Port FBEFh READ: Kempston Mouse 8 bit Y position (up: +ve, down: -ve) NOTE: * Movement is accumulated so you only need to read the mouse status when you want e.g. once per frame.* Speed is 1 for slow movement of the mouse buttons supported and 12 for very fast movement.* The position values are not reset after reading.* The position values do not change if the mouse is not moving * Position values wrap around e.g. when moving left with movement speed of 1, 0 wraps around to be confirmedff (0-1 -> ff) and when moving right with movement speed of 1, ff wraps around to 0 (ff+1->0)* To calculated the distance moved since last read subtract the new value read from the previous value read and AND with ff. The value is the amount of movement.0 means no movement. -ve means moving left/down, +ve means right/up.

==== Buttons:==== 

bit 0: Left Right Button (active low) bit 1: Right Left Button (active low) bit 2..7: not used. report as high (1) Number of supported mouse buttons is unknown. It is believed to be 2. The mouse that comes with the interface has two.

// # initMouse initializes variables and centers the mouse pointer on screen function def initMouse() {: maxX = 639; maxY = 399; // # centering the mouse pointer on the screen virtualX = maxX >> 1; // virtualX = # maxX/2 virtualY = maxY >> 1; // virtualY = # maxY/2 // # store raw mouse values oldX = inp(&FBEE); oldY = inp(&FBEF); // # get mouse pointer position refreshMouse();  }def refreshMouse(): # get raw mouse values rawX = inp(&FBEE) rawY = inp(&FBEF) # get the relative mouse displacement since last call deltaX = rawX - oldX deltaY = rawY - oldY # store raw mouse values oldX = rawX oldY = rawY # calculate new unclipped virtual position virtualX = virtualX + deltaX virtualY = virtualY - deltaY # Kempston mouse Y-axis is inverted compared to screen coordinates! # perform clipping if virtualX < 0: virtualX = 0 elif virtualX > maxX: virtualX = maxX if virtualY < 0: virtualY = 0 elif virtualY > maxY: virtualY = maxY # now we translate position from the virtual screen to the current CPC screen mode mouseX = virtualX if graphicsMode == 2 else (virtualX >> 1 if graphicsMode == 1 else virtualX >> 2) mouseY = virtualY >> 1 # virtualY/2 == Manual == * Any manual exists?  == Downloads == * Any kempston example or driver software exists?

[[Category:Peripherals]][[Category:Input Device]]