Inputs a data byte from the input port, with the address given by the value of int-exp. The int-exp must be in the range of 0...255.
Program Example.
Port Number Use
00 PIO port A data port
01 PIO port A control port
02 PIO port B data port
03 PIO port B control port
04 RTC address port
06 RTC write port
07 RTC read port
08 Colour control port
09 Viatel/Colour "wait off" port
10 PAK selection OUTput to port
NET selection INput from port
11 ROM READ latch on bit 0
12 6545 CRTC address status port
13 6545 CRTC data port
28 Video Memory Latch
68 FDC command/status
69 FDC track register
70 FDC sector register
71 FDC data register
72 Controller select/side/DD latch