03A0-03AF ---- 1st SDLC (Binary Synchronous Data Link Control adapter)


0380   r/w  on board 8255 port A, internal/external sense
0381   r/w  on board 8255 port B, external modem interface
0382   r/w  on board 8255 port C, internal control and gating
0383   r/w  on board 8255 mode register
0384   r/w  on board 8253 counter 0 unused
0385   r/w  on board 8253 channel 1 inactivity time-out
0386   r/w  on board 8253 channel 2 inactivity time-out
0387   r/w  on board 8253 mode register
0388   r/w  on board 8251 data
0389   r/w  on board 8251 command/mode/status register