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98 lines
2.0 KiB
98 lines
2.0 KiB
/* flip.c 11/17/2012 dwg - reverse the contrast */
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#include "std.h"
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#include "applvers.h"
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#include "diagnose.h"
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#define VDA_N8 4
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#define VDAINI 0x40
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#define VDAQRY 0x41
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#define VDARES 0x42
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#define VDASCS 0x43
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int vdaini(devunit,vidmode,bitmapp)
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unsigned int devunit;
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unsigned int vidmode;
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unsigned int bitmapp;
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{
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hregbc = (VDAINI << 8) | devunit;
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printf("hregbc = 0x%04x\n",hregbc);
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hregde = vidmode;
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printf("hregde = 0x%04x\n",hregde);
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hreghl = bitmapp;
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printf("hreghl = 0x%04x\n",hreghl);
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diagnose();
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printf("VDAINI called, return code was 0x%02x\n",hrega);
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return hrega;
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}
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bitlook()
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{
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unsigned char *p;
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int ascii,row;
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p = 0x8000;
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for(ascii=0;ascii<256;ascii++) {
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printf("ascii = 0x%02x ",ascii);
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for(row=0l;row<8;row++) {
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printf("0x%02x ",*p++);
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}
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printf("\n");
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}
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}
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int vdaqry(devunit,bitmapp)
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unsigned int devunit;
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unsigned int bitmapp;
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{
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hregbc = (VDAQRY << 8) | devunit;
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printf("hregbc = 0x%04x\n",hregbc);
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hreghl = bitmapp;
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if(hreghl != 0x8000) printf("vdaqry says hl != 0x8000\n");
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diagnose();
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printf("VDAQRY called, status was 0x%02x\n",hrega);
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printf(" video mode was 0x%02x\n",hregbc & 255);
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printf(" row count was 0x%02x(%d)\n",
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(hregde >> 8),(hregde >> 8) );
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printf(" column count was 0x%02x(%d)\n",
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hregde & 255, hregde & 255);
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/* if(0 != bitmapp) {
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printf("vdaqry called with bitmap pointer\n");
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bitlook();
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}
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*/
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return hrega;
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}
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int main(argc,argv)
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int argc;
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char *argv[];
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{
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unsigned char * p;
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unsigned char byte;
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int offs;
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int retcode;
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printf("flip.com(c) 11/15/2012 dwg - \n\n");
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retcode = vdaqry(VDA_N8 << 4,0x8000);
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p = 0x8000;
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for(offs=0;offs<256*8;offs++) {
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byte = *p;
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byte = byte ^ 255;
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*p = byte;
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p++;
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}
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/* bitlook(); */
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vdaini(VDA_N8 << 4, 0, 0x8000);
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}
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