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uapple.asm
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Assembly Source File
|
1994-07-13
|
3KB
|
119 lines
;
;VERSION UAPPLE (revised JUL 20, 1981)
;
;User routines for BSTAM version 4.3 or 4.4, for use with
;Apple CP/M with an Apple Communications Interface or
;a CCS 7710A Serial Interface in slot 2.
; By Keith Petersen, W8SDZ
;
;DEFINE PORT ADDRESSES
;
STATUS EQU 0E0A0H ;COM. OR CCS CARD STATUS LOC.
DATA EQU 0E0A1H ;COM. CARD DATA - SLOT 2
;
;DEFINE ASCII CHARACTERS USED
;
CR EQU 0DH
LF EQU 0AH
;
; IF YOU WISH TO USE OTHER REGISTERS SUCH AS HL,BC,DE
; (NOT INCLUDING SP REGISTER)
; BE SURE TO PUSH BSTAM'S REGISTERS ON TO STACK AND POP
; THEM BACK OFF BEFORE RETURNING TO BSTAM.
; THERE IS AMPLE ROOM TO PUSH ALL REGISTERS ONTO BSTAM'S
; STACK, PLUS ROOM FOR 10 LEVELS OF CALL'S.
;
; THERE ARE 300 BYTES OF USER SPACE AVAILABLE TO YOU.
;
; THE JUMP'S CODED AT THE BEGINNING OF THIS PROGRAM
; CANNOT BE MOVED IN ANY WAY.
;
BEGIN ORG 103H
;
INITIL JMP INITIU ;UART/USART INITIALATION ENTRY POINT
INSPORT JMP INSPRU ;STATUS PORT READ ENTRY POINT
ERRSET JMP ERRSTU ;UART/USART ERROR RESET ENTRY POINT
INPORT JMP INPRTU ;READ DATA PORT ENTRY POINT
OUTPORT JMP OUTPRU ;WRITE DATA PORT ENTRY POINT
;
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)
;
LDA DATA ;CLEAR DATA PORT
LDA DATA ;AGAIN TO MAKE SURE
CALL SIGNON ;TELL USER WHAT'S IMPLEMENTED
RET ;RETURN TO BSTAM
;
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. 20 BIT SET IF FRAMING ERROR
; 2. 10 BIT SET IF OVERRUN ERROR
; 3. 08 BIT SET IF PARITY ERROR
; 4. 04 BIT SET IF TRANSMITTER EMPTY
; IF YOUR UART/USART DOES NOT HAVE TRANSMITTER
; EMPTY FEATURE, THEN ALLWAYS SET THIS BIT ON.
; 5. 02 BIT SET IF RECEIVER READY
; 6. 01 BIT SET IF TRANSMITTER READY
; 7. DO NOT SET THE 80 BIT OR 40 BIT
;
LDA STATUS ;TBE = 02H, RDA = 01H
RLC
ANI 6 ;MASK OFF UNWANTED BITS
ORI 1 ;BOGUS TBE BIT
RET
;
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.
;
RET ;RETURN TO BSTAM
;
INPRTU EQU $
; THIS IS THE READ DATA PORT ROUTINE.
; BEFORE THIS ROUTINE IS ENTERED THE 02 BIT OF
; STATUS READ ROUTINE MUST HAVE BEEN SET.
; DO NOT CLEAR THE 80 BIT FROM THE DATA INPUT PORT.
; RETURN WITH REGISTER A LOADED WITH INPUT DATA.
;
LDA DATA ;GET DATA FROM PORT
RET ;RETURN TO BSTAM
;
OUTPRU EQU $
; THIS IS THE WRITE DATA PORT ROUTINE.
; BEFORE THIS ROUTINE IS ENTERED THE 04 BIT AND 01 BIT
; OF STATUS READ MUST BE SET.
; DO NOT CLEAR THE 80 BIT FROM THE DATA OUTPUT PORT.
; REGISTER A CONTAINS THE OUTPUT DATA.
;
STA DATA ;SEND DATA TO REMOTE CPU
RET ;RETURN TO BSTAM
;
MESSGE: DB CR,LF,CR,LF
DB 'Version for Apple II as of 7/20/81.',CR,LF
DB 'For Apple Communications Interface or',CR,LF
DB 'CCS 7710A Serial Interface in slot 2.',CR,LF,'$'
;
SIGNON: PUSH B
PUSH D
PUSH H
LXI D,MESSGE
MVI C,9
CALL 5 ;ANNOUNCE VERSION TO USER
POP H
POP D
POP B
RET
;
END