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Don't remember
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Bill Chatfield
parent
36e58cde89
commit
7377bf0f90
138
more.s
138
more.s
@ -12,8 +12,13 @@
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* accumulator (A) is less than the parameter: A < Param
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* BGE - Branch if Accum >= Param is BCS
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PROMPT equ $33
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BUFF equ $200
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* System subroutines stored in ROM
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* System subroutines stored in Monitor ROM
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GETLN equ $fd6a ; Reads a line of input, with prompt from $33
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GETLNZ equ $fd67 ; Reads a line of input, CR first
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GETLN1 equ $fd6f ; Reads a line of input, no prompt
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CROUT equ $fd8e ; Outputs a carriage return
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PRBYTE equ $fdda ; Outputs a byte
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COUT equ $fded ; Outputs a character
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@ -29,9 +34,10 @@ CLOSE equ $cc
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* Constants
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EOF equ $4c ; End of file
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ADDR equ $06
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PTR equ $06
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MAX_EC equ $5a ; The largest error code
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CR equ $0d ; Carriage return
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BUF_SIZ equ $00ff
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WRITE_CHAR mac
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@ -65,21 +71,22 @@ finish pla ; Restore Y by pulling stack into A
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WRITE_STR mac
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tya ; Preserve Y
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tya ; Preserve Y
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pha
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lda ]1 ; Length byte
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lda ]1 ; Length byte
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sta len
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ldy #1 ; Prepare loop index
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nextch cpy len ; Check if beyond end of string
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bcc writech ; Y is Less than
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beq writech ; Or equal to len
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ldy #1 ; Prepare loop index
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nextChar tya
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cmp len ; Check if beyond end of string
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bcc writeChar ; Y is Less than
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beq writeChar ; or equal to len
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jmp finish
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writech lda ]1,y ; Load a character
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writeChar lda ]1,y ; Load a character
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jsr COUT
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iny
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jmp nextch
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jmp nextChar
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len db 0
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finish pla ; Restore Y
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finish pla ; Restore Y
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tay
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eom
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@ -89,6 +96,44 @@ COPY_BYTE mac
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sta ]2
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eom
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* Copies a line out of BUFF into ]1.
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* Length is in X as is done by GETLN.
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COPY_BUFF mac
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tya ; Preserve Y register
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pha ; by pushing it on the stack
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txa ; Transfer X to A for compare
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cmp #$ff ; Check if string is too long
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bne startCopy ; If not, get started
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dex ; If so, shrink to fit with length byte
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startCopy stx ]1 ; Store length to target string
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ldy #0 ; Initialize loop index
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nextChar tya ; Move current position to A
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cmp ]1 ; Compare current position with length
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beq endCopyLine ; Quit if we've reached the end
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lda BUFF,y ; Load current character
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iny ; BUFF and ]1 are off by 1 because of len byte
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sta ]1,y ; Store character into target string
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jmp nextChar ; Continue with next character
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endCopyLine pla ; Restore Y by pulling value from stack
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tay ; and transferring to Y
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eom
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WRITE_BUFF mac
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tya
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pha
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stx len
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ldy #0
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nextByte tya
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cmp len
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beq done
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lda BUFF,y
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jsr COUT
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iny
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jmp nextByte
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done pla
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tay
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eom
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* Starting at $9000 because:
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* $800 overwrites Applesoft
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* $803 is where Applesoft programs start
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@ -97,17 +142,21 @@ COPY_BYTE mac
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mainProgram
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org $8000
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lda #<fileName
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sta oPathPtr
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lda #>fileName
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sta oPathPtr+1
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getFileNam
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WRITE_ASC prompt
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COPY_BYTE #"?";PROMPT
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jsr GETLN1
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WRITE_ASC buffText
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WRITE_BUFF
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jsr CROUT
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COPY_BUFF fileName
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openFile jsr MLI
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db OPEN
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da openParams
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bne openErrorHandler
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readFile pmc COPY_BYTE,fileNum;readNum
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readFile COPY_BYTE fileNum;readNum
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readNext jsr MLI
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db READ
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da readParams
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@ -121,15 +170,18 @@ writeScreen
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sty lineCount
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sty charCount
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nextChar lda readIoBuf,y
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inc charCount
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ora #$80
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jsr COUT
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cmp $0d
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bne continue
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inc lineCount
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continue inc charCount
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continue cpy #<BUF_SIZ
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beq readNext
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iny
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jmp nextChar
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closeFile pmc COPY_BYTE,fileNum;closeNum
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closeFile COPY_BYTE fileNum;closeNum
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jsr MLI
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db CLOSE
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dw closeParams
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@ -137,19 +189,19 @@ closeFile pmc COPY_BYTE,fileNum;closeNum
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jmp endMain
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openErrorHandler
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sta errorCode
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pmc WRITE_ASC,openFailureText
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WRITE_ASC openFailureText
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jmp errorHandler
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readErrorHandler
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sta errorCode
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pmc WRITE_ASC,readFailureText
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WRITE_ASC readFailureText
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jmp errorHandler
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closeErrorHandler
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sta errorCode
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pmc WRITE_ASC,closeFailureText
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WRITE_ASC closeFailureText
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errorHandler
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pmc WRITE_STR,fileName
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pmc WRITE_CHAR,":"
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pmc WRITE_CHAR," "
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WRITE_STR fileName
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WRITE_CHAR ":"
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WRITE_CHAR " "
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lda errorCode
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cmp #MAX_EC ; Compare by A - MAX_EC
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bcs unknownError ; Branch if A >= MAX_EC
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@ -158,51 +210,55 @@ errorHandler
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adc errorCode ; Double for indexing addresses
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tax
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lda errorMessages,x
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sta ADDR
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sta PTR
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inx
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lda errorMessages,x
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sta ADDR+1
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sta PTR+1
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bne writeError
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lda ADDR
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lda PTR
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bne writeError
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unknownError
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pmc WRITE_ASC,unknownErrorCodeText
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pmc WRITE_CHAR,"$"
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pmc WRITE_BYTE,errorCode
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WRITE_ASC unknownErrorCodeText
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WRITE_CHAR "$"
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WRITE_BYTE errorCode
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jsr CROUT
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jmp endMain
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writeError
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pmc WRITE_ASC,(ADDR)
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pmc WRITE_CHAR," "
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pmc WRITE_ASC,errorCodeText
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pmc WRITE_CHAR,"$"
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pmc WRITE_BYTE,errorCode
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pmc WRITE_CHAR,")"
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WRITE_ASC (PTR)
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WRITE_CHAR " "
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WRITE_ASC errorCodeText
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WRITE_CHAR "$"
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WRITE_BYTE errorCode
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WRITE_CHAR ")"
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jsr CROUT
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endMain
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COPY_BYTE #"]";PROMPT ; Restore normal prompt
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rts
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* DAT-uh
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openParams db 3 ; Parameter count
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oPathPtr ds 2 ; Input param - file to open
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oPathPtr da fileName ; Input param - file to open
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oBufPtr da openIoBuf ; Input param - I/O buffer
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fileNum ds 1 ; Output param - file ref num
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readParams db 4
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readNum ds 1
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da readIoBuf
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reqCount dw 512
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reqCount dw BUF_SIZ
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transCount ds 2
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closeParams db 1 ; Parameter count
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closeNum db 0 ; Input param - ref num to close
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fileName db 4
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asc "BLAH"
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fileName ds $ff ; String starting with length byte
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charCount ds 2
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lineCount ds 1
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len ds 1
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buffText asc "BUFF=",00
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prompt asc "ENTER FILE NAME: ",00
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errorCode db 0
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openFailureText asc "FAILED TO OPEN FILE ",00
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readFailureText asc "FAILED TO READ FILE ",00
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@ -342,5 +398,5 @@ filler ds \,$00
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* Must start on page boundary
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*
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openIoBuf ds 1024
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readIoBuf ds 512
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readIoBuf ds BUF_SIZ
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