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RDBOOT.SRC
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Text File
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2009-10-10
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1KB
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53 lines
;BPUT"READBOOT.SRC"
;RPUT"READBOOT.SRC"
;
.LIB HARDJUMP.EQ
.LIB HARDISKZ.EQ
;
* = $0840
START JSR HDINIT ;INIT CTL BLOCKS
JSR RESET ;ISSUE THE RESET
BCS RESETERROR
LDA #$80
LDY #$28 ;GET NUMBER OF SECTORS TO READ
LDX #$40 ;GET SECTOR NUMBER
JSR READIT ;GO CONVERT AND READ
BCS READERROR ;GO IF BAD
LDA #$E0 ;ADDRESS INPUT AREA
LDY #$10
LDX #$69
JSR READIT
BCS READERROR
JSR 52224
JMP $C000 ;END
;
READIT STA BUFADR+1 ;ADDRESS INPUT
STY BLKCNT ;# 512 BYTE BLOCKS
STX SECNUM+2
LDA #0
STA HDNUM ;CLEAR THE DRIVE NUMBER
STA SECNUM
STA SECNUM+1
JSR SEC2CYLDCB ;CONVERT TO DISK ADDR
LDA HEAD ;FILL THE DCB
STA HDNUM
LDA CYLLSB ;GET LOW CYL ADDR
STA CYLNUM
LDA CYLMSB ;GET HI CYL AND SECTOR
STA SECADR ;PUT IN DCB
JMP READ ;READ AND RETURN TO CALLER
;
RESETERROR LDX #0
.BYT $2C ;
READERROR LDX #0
READERRORL LDA RESETMSG,X
BEQ DONE
JSR $FFD2
INX
BNE READERRORL
DONE RTS
BRK
;
RESETMSG .BYT 'RESET FAILED',13,0
READERRMSG .BYT 'READ FAILED',13,0
.END