63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* ------------------------------------------------------------------------
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System : Manx Aztec C65 Version 3.2b
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MS-DOS cross-development environment
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Platform : Apple IIe 128K PRODOS 8
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Program : d2init.c
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Description : G2 Library Routine
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Double Hi-Res Routines
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for ProDOS 8 Sys Programs
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Uses Page 2 Double Hi-Res to avoid
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ProDOS Sys Program Load Address at 0x2000
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Written by : Bill Buckels
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Date Written : February 2013
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Revision : 1.0 First Release
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Licence : You may use these routines for whatever you wish as long
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as you agree that Bill Buckels has no warranty or
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liability obligations whatsoever from said use.
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------------------------------------------------------------------------ */
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/*
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CLR80VID = $C00C ;disable 80-column display mode (WR-only)
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SET80VID = $C00D ;enable 80-column display mode (WR-only)
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unsigned char *clr80vid = (unsigned char *)0xc00c;
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unsigned char *set80vid = (unsigned char *)0xc00d;
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SET80STORE=$C001 ;80STORE On- enable 80-column memory mapping (WR-only)
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CLR80STORE=$C000 ;80STORE Off- disable 80-column memory mapping (Write)
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unsigned char *set80store = (unsigned char *)0xc001;
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unsigned char *clr80store = (unsigned char *)0xc000;
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*/
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d2hireson()
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{
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/* page 2 hires */
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#asm
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jsr $c300 ; TURN ON 80-COLUMN MODE
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sta $c000 ; TURN OFF 80 STORE
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sta $c050 ; GRAPHICS
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sta $c055 ; PAGE TWO
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sta $c052 ; GRAPHICS ONLY, NOT MIXED
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sta $c057 ; HI-RES
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sta $c05e ; TURN ON DOUBLE RES
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#endasm
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}
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d2hiresoff()
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{
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#asm
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sta $c051 ; TEXT - HIDE GRAPHICS
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sta $c05f ; TURN OFF DOUBLE RES
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sta $c054 ; PAGE ONE
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sta $c001 ; TURN ON 80 STORE
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jsr $c300 ; TURN ON 80-COLUMN MODE
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#endasm
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} |