Specifications

Parallel Port

The parallel centronics port is programmable (see Lit. [4]). It may operate in uni-

directional mode (AT standard) or bi-directional mode. It contains the following

registers:

n Bi-directional parallel port for data transfer

n Status register for requests of the printer status

n Readback control register

Serial Port

Both serial RS-232-C ports are programmable via the FDC37C92x chip. This highly

integrated chip features two independent channels for the AT-compatible 16550

port. Each channel controls its own send/receive channel, has its own data register

and interrupts. Modem control signals are provided for each channel.

Programmable features are:

n Serial data transmission with 5, 6, 7 or 8-bit characters

n Generation/detection of even, odd or no parity

n Generation of 1,1.5 or 2 Stop-Bits

n Baud rate generator to divide the 1.8432 MHz clock frequency

5.12

5.13