ZX Spectrum

ZX Spectrum I/O port functionality Filter ZX Spectrum I/O port functionality topics

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table started by pak21 for the ZX Spectrum Base
A piece of functionality accessed by using the I/O ports on the ZX Spectrum or one of its clones
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x name x image x Port mask x Port value x Found on computers x article
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x ZX Spectrum ULA   1 0 ZX Spectrum  
ZX Spectrum 128
ZX Spectrum +3
x ZX Printer   4 0    
x Kempston joystick   224 0    
x ZX Spectrum 128 AY register select   49,154 49,152 ZX Spectrum 128  
ZX Spectrum +3
x ZX Spectrum 128 AY data   49,154 32,768 ZX Spectrum 128  
ZX Spectrum +3
x ZX Spectrum 128 memory control   32,770 0 ZX Spectrum 128  
x ZX Spectrum +3 primary memory control   49,154 16,384 ZX Spectrum +3  
x ZX Spectrum +3 secondary memory control   61,442 4,096 ZX Spectrum +3  
x ZX Spectrum +3 FDC read/write   61,442 12,288 ZX Spectrum +3  
x ZX Spectrum +3 FDC status   61,442 8,192 ZX Spectrum +3  
x ZX Spectrum +3 parallel printer   61,442 0 ZX Spectrum +3  
x Timex HSR   255 244 Timex Computer 2048  
Timex Sinclair 2068
x Timex ULA   255 254 Timex Computer 2048  
Timex Sinclair 2068
x Timex DEC   255 255 Timex Computer 2048  
Timex Sinclair 2068
x Timex AY register select   255 245 Timex Sinclair 2068  
x Timex AY data   255 246 Timex Sinclair 2068  
x ZX Interface 1 microdrive control   24 0    
x ZX Interface 1 RS232   24 8    
x ZX Interface 1 network   24 16    
x DivIDE I/O   227 163    
x DivIDE control   255 227    
x ZXATASP port A   927 159    
x ZXATASP port B   927 415    
x ZXATASP port C   927 671    
x ZXATASP control port   927 927    
x ZXCF IDE read/write   4,340 4,276    
x ZXCF memory control   4,340 180    
x Fuller AY register select   255 63    
x Fuller AY data   255 95    
x Fuller joystick   255 127    
x Betadisk SR   255 31    
x Betadisk TR   255 63    
x Betadisk SEC   255 95    
x Betadisk DR   255 127    
x Betadisk SP   255 255    
x +D SR   255 227    
x +D TR   255 235    
x +D SEC   255 243    
x +D DR   255 251    
x +D CN   255 239    
x +D memory control   255 231    
x +D printer   255 247    
x Kempston Mouse buttons   289 1    
x Kempston Mouse X position   1,313 257    
x Kempston Mouse Y position   1,313 1,281    
x Spectranet programmable trap   65,535 33,005    
x Spectranet control register   65,535 33,007    
x 64 colour ULA register port   65,535 48,955    
x 64 colour ULA data port   65,535 65,339    
x SpeccyBoot control register   224 128    
x SpecDrum output   255 223    
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