;
;BSTAM 4.6 UHSIO4.ASM NORTH STAR HSIO-4
;
;Modification written by Robb Adams (WA9ZMO/8)
;6354 North Twelth Street, Kalamazoo, MI 49009
;
;10-Oct-82 This version will adapt the North Star
;HSIO-4 I/O Board to BSTAM. The user need only make
;three modifications if desired;
;
; BOARD ADDR - PORT ADDR - BAUD RATE
;
;----------------------------------------------------------
BEGIN ORG 103H
INITIL JMP INITIU ;INITIALATION ENTRY POINT
INSPORT JMP INSPRU ;STATUS PORT READ ENTRY POINT
ERRSET JMP ERRSTU ;ERROR RESET ENTRY POINT
INPORT JMP INPRTU ;READ DATA PORT ENTRY POINT
OUTPORT JMP OUTPRU ;WRITE DATA PORT ENTRY POINT
DUART JMP DUARTU
DUARTU RET
;----------------------------------------------------------
BDOS EQU 05H ;
CR EQU 0AH ;CARRIAGE RETURN
LF EQU 0DH ;LINE FEED
;----------------------------------------------------------
PA EQU 00H ;PORT A
PB EQU 04H ;PORT B
PC EQU 08H ;PORT C
PD EQU 0CH ;PORT D
;----------------------------------------------------------
B19200 EQU 00H ;-- BAUD RATES FOLLOW --
B9600 EQU 01H
B4800 EQU 02H
B2400 EQU 03H
B1200 EQU 04H
B600 EQU 05H
B300 EQU 06H
B110 EQU 07H
;----------------------------------------------------------
BAS EQU 10H ;<- CHANGE BOARD ADDRESS HERE
PAD EQU PD ;<- CHANGE PORT ADDRESS HERE
BAUD EQU B300 ;<- CHANGE BAUD RATE HERE
;----------------------------------------------------------
PORT EQU BAS+PAD ;ADDRESS OF CHOSEN PORT
STATPT EQU PORT+3 ;STATUS PORT
DATAPT EQU PORT+2 ;DATA PORT
INTRPT EQU PORT+1 ;INTERRUPT PORT
BAUDPT EQU PORT+0 ;BAUD PORT
;----------------------------------------------------------
MI EQU 4EH ;1 STOP,8 DATA
CI EQU 37H ;ERROR RESET AND CHIP ENABLE
ERSET EQU 37H ;ERROR RESET AND CHIP ENABLE
;----------------------------------------------------------
INITIU EQU $
;THIS IS THE UART/USART INITIALATION ROUTINE.
;
;TO BE COMPATIBLE WITH MOST BSTAM USERS USE FOLLOWING
;INITIALATION GUIDE LINES:
;
;1. USE 1 STOP BIT (OPTIONAL - 2)
;2. USE 8 DATA BITS (MUST)
;3. USE 1 START BIT (MUST)
;4. USE 16X FOR CLOCK RATE (MUST)
;5. USE ASYNCHRONOUS MODE ONLY (MUST)
MVI A,B300 ;<- CHANGE BAUD RATE HERE
OUT BAUDPT
CALL SIGN
MVI A,03H
CALL NOOP
CALL NOOP
MVI A,040H ;RESET 8251
CALL NOOP
MVI A,MI ;SEND MODE COMMAND
CALL NOOP
MVI A,CI ;ENABLE AND RESET ERRORS (FE,OE,PE)
CALL NOOP
IN DATAPT ;CLEAR BUFFER
IN DATAPT ;... TWICE
RET ;RETURN TO BSTAM
NOOP: OUT STATPT
NOP ! NOP ! NOP
NOP ! NOP ! NOP
RET
INSPRU EQU $
;THIS IS THE STATUS READ PORT ROUTINE.
;WHEN EXITING THIS ROUTINE BSTAM EXPECTS IN REGISTER A
;THE FOLLOWING BITS TO BE SET IF NEEDED:
;
;1. 02 BIT SET IF RECEIVER READY
;2. 01 BIT SET IF TRANSMITTER READY
IN STATPT ;FROM 8251 STATUS PORT
RET ;RETURN TO BSTAM
ERRSTU EQU $
;THIS IS THE ERROR RESET FOR UART/USART ROUTINE.
;YOUR UART/USART MAY NOT NEED TO BE RESET IF FRAMING,
;OVERRUN, OR PARITY ERROR IS FOUND. IF THIS IS YOUR
;CASE, JUST DO A RETURN.
MVI A,ERSET ;RESET ERRORS
OUT STATPT ;TO STATUS PORT
RET ;RETURN TO BSTAM
INPRTU EQU $
;THIS IS THE READ DATA PORT ROUTINE.
IN DATAPT ;GET DATA FROM PORT
RET ;RETURN TO BSTAM
OUTPRU EQU $
;THIS IS THE WRITE DATA PORT ROUTINE.
OUT DATAPT ;SEND DATA TO REMOTE CPU
RET ;RETURN TO BSTAM
MSGE: DB CR,LF,CR,LF
DB 'Version: North Star HSIO-4 11-Oct-82'
DB CR,LF
DB 'Baud: 300 Port: D by Robb Adams'
DB CR,LF,LF,'$'
SIGN: PUSH B ! PUSH D ! PUSH H
LXI D,MSGE
MVI C,9
CALL BDOS
POP H ! POP D ! POP B
RET
END BEGIN
