Advanced Communication Board Developer Toolkit 1993

ABSTRACT:  INT1.C

INT1.C is an interrupt driven asynchronous terminal program. The base address
is 238 Hex and the IRQ should be jumpered to 5. The interrupt mode jumper
should be set to shared if the ACB is sharing an IRQ or to normal if the ACB
is the only device on the IRQ. Please note that if an ACB is sharing an IRQ
with another device, that device must be disabled when executing this example
program. No additional jumpers are needed. To build the program, the ACB.OBJ
and the INT.OBJ file must be linked from the \LIBRARY directory. The program
will terminate when the "Esc" key is typed from the keyboard. This program is
set up for 19.2K baud, no parity, 8 data bits, and 1 stop bit. This program
will interrupt on receive characters only. All transmitted characters are sent
in a polling loop in the main() function. All characters received in the
interrupt service routine are stored in the buffer. The buffer size is fixed
at 100. The buffer contents is displayed once the "Esc" key is pressed. Keep
in mind that this example is a very simple interrupt driven program. Please
refer to the DMA and / or interrupt driven examples for higher throughput
examples.

Cables:

For asynchronous mode, only transmit and receive are needed. The program may
be used in a stand alone loop-back configuration, or with another PC with
an asynchronous COM: port card installed.

  For Loop-Back Plug:

     For Single Ended (RS-232, MIL-188/114)
	Connect Tx to Rx

     For Differential Interface (RS-530, V.35, MIL-188/C, etc.)
	Connect Tx+ to	Rx+
	Connect Tx- to	Rx-

  Point to Point Cable:

     For Single Ended (RS-232, MIL-188/114)
	Connect Tx at point A to Rx at point B
	Connect Tx at point B to Rx at point A

     For Differential Interface (RS-530, V.35, MIL-188/C, etc.)
	Connect Tx+ at point A to Rx+ at point B
	Connect Tx- at point A to Rx- at point B
	Connect Tx+ at point B to Rx+ at point A
	Connect Tx- at point B to Rx- at point A

Dip-Switch and Jumpers:

Note: If a jumper is not listed, that jumper is not relevant to this example.

    ACB-104		ACB-II		ACB-530
	SW1 2,3,4,8 On	    SW1 1 On	    SW1 2,3,4,8 On
	E3 5,R		    E9 On	    E1 N or M
					    E3 5

    ACB-III		ACB-IV		ACB-V
	SW2 2,3,4 On	    SW1 2,3,4 On    SW1 2,3,4 On
	E8 5,N		    E8 5,N	    E3 5,N

   ACB-VI		ACB-MP		MAXPORT
       SW1 2,3,4,8 On	    See Note 2	    SW1 2,3,4,8 On
       E9 N or M			    E2 5
       E11 5				    E3 N or M
       See Note 1

Note 1:  The source code must be modified to enable the interrupts on the
       ACB-VI. The ACB-VI has the ability to enable and disable interrupts
       from the on-board status control register.

Note 2:  This example sets up an interrupt service routine by replacing a
       vector entry in the interrupt vector table. On a Micro Channel
       Architecture (MCA) computer this is not the recommended method of
       installing an interrupt handler. This example can be modified to chain
       the vector rather than replace / restore. For further assistance,
       please contact technical support at the numbers listed in the
       README.TXT file in the root directory of this diskette.

Build Dependencies:

INT1.C
 * ACB.OBJ
 * ACB.H
 * INT.OBJ
 * INT.H
 * Z8530.H

 * Denotes that files are located in the \LIBRARY directory.