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PBURN.ASM
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Assembly Source File
|
1984-04-29
|
1KB
|
66 lines
;
; PROM BURNER (FOR BYTESAVER 2708/1K PROMS)
;
BRNLPS EQU 128 ; 128*.8MS>=100MS PGMING TIME
;
ORG 100H
JMP PBURN
NOP
RAM: DW 200H ; FROM (IN RAM)
ROM: DW 0FC00H ; TO (IN ROM) ON LAST PROM
SIZE: DB 1 ; 'K' TO BURN
BCNT: DB 0
;
SETADR:
LHLD ROM
XCHG ; DE:=ROM ADDRESS
LHLD RAM ; HL:=RAM ADDRESS
LDA SIZE
ADD A
ADD A ; *4 TO CONVERT TO 'K'
MOV B,A
MVI C,0 ; BC:=SIZE TO BURN
RET
;
PBURN: XRA A
LXI SP,STAK
;
PBLP: STA BCNT
CALL SETADR
;
PBLPP: MOV A,M
STAX D
INX D
INX H
;
DCX B
MOV A,B
ORA C
JNZ PBLPP
; TEST FOR ENOUGH PASSES
LDA BCNT
INR A
OUT 255 ; SHOW WHAT PASS I'M ON TO THE WORLD
CPI BRNLPS
JNZ PBLP
;
;
; VERIFY PASS
;
CALL SETADR
VLP: LDAX D
CMP M
JZ VOK
RST 7 ; BAD DATA
;
VOK: INX D
INX H
DCX B
MOV A,B
ORA C
JNZ VLP
;
RST 7 ; BREAK TO DDT
DS 5
STAK: DS 0