mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
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f5c097e70f
- added error handling - no more massive library; just a subroutine per file. This is because Merlin doesn't like large files. - added a "minify" BASIC utility that gets rid of *most* comments in a source textfile. This dramatically reduces space used if you're not terribly interested in non-inline comments. - TFILL,THLIN,TVLIN and TPUT not directly access the video memory (page one), making for a much faster draw without interfering COUT. - some stylistic changes, primarily to TFILL - change required files to minified versions only. The whole files can be found on disk 2. - got a norovirus so pretty much couldn't do anything requiring sustained attention, so focused on small things here and not on my dayjob. Cool. - created a required.vars file that separates variables and settings from the other required files. Not minified. - This current bout of revision will probably be the last, once all initial 6 disks are revamped, that focuses on all subroutines/macros in a given library at a single push. After this round, commits will be done on a subroutine or related file basis.
77 lines
1.8 KiB
Plaintext
77 lines
1.8 KiB
Plaintext
*
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*``````````````````````````````*
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* DPRINT :: PRINT FROM MEMORY *
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*- -*
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* PRINTS DATA FROM SPECIFIED *
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* MEMORY LOCATION UNTIL *
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* REACHING 00 (STRING TERM). *
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*- -*
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* CLOBBERS: *
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* *
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* FLAGS: -------- REG: A-YM *
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*- -*
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* CYCLES: 25+ *
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* SIZE: *
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*- -*
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* USAGE: *
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* LDA #>(ADDRESS) *
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* PHA *
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* LDA #<(ADDRESS) *
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* PHA *
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* JSR DPRINT *
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*- -*
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* ENTRY *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* LOW BYTE OF PRINT ADDRESS *
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* HI BYTE OF PRINT ADDRESS *
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*- -*
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* EXIT *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* *
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* A = LOW BYTE OF ADDRESS *
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* X = UNCHANGED *
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* Y = LENGTH OF STRING *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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DPRINT
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*
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** SAVE RETURN ADDRESS
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*
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PLA
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STA RETADR
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PLA
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STA RETADR+1
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*
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** GET ADDRESS, STORE IN ZERO PAGE
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*
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PLA
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STA ADDR1
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PLA
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STA ADDR1+1
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*
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LDY #$00
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:LOOP
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LDA (ADDR1),Y
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BEQ :EXIT
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JSR COUT1
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INY
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BNE :LOOP
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:EXIT
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*
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** RESTORE RETURN ADDRESS
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*
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LDA RETADR+1
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PHA
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LDA RETADR
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PHA
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*
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RTS
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