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Setup the Tandy CRT/CPU page register

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Add the Tandy set CRT/CPU page functions


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1840
This commit is contained in:
Sjoerd van der Berg 2004-06-18 08:24:05 +00:00
parent 35b0cc060c
commit 319cae5940
3 changed files with 29 additions and 4 deletions
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21
src/ints/int10.cpp
View file

@ -72,7 +72,26 @@ static Bitu INT10_Handler(void) {
reg_ah=0;
break;
case 0x05: /* Set Active Page */
if (reg_al & 0x80) LOG(LOG_INT10,LOG_NORMAL)("Tandy set CRT/CPU Page Func %x",reg_al);
if (reg_al & 0x80 && machine==MCH_TANDY) {
Bit8u crtcpu=real_readb(BIOSMEM_SEG, BIOSMEM_CRTCPU_PAGE);
switch (reg_al) {
case 0x80:
reg_bh=crtcpu & 7;
reg_bl=(crtcpu >> 3) & 0x7;
break;
case 0x81:
crtcpu=(crtcpu & 0xc7) | ((reg_bl & 7) << 3);
break;
case 0x82:
crtcpu=(crtcpu & 0xf8) | (reg_bh & 7);
break;
case 0x83:
crtcpu=(crtcpu & 0xc0) | (reg_bh & 7) | ((reg_bl & 7) << 3);
break;
}
IO_WriteB(0x3df,crtcpu);
real_writeb(BIOSMEM_SEG, BIOSMEM_CRTCPU_PAGE,crtcpu);
}
else INT10_SetActivePage(reg_al);
break;
case 0x06: /* Scroll Up */

1
src/ints/int10.h
View file

@ -39,6 +39,7 @@
#define BIOSMEM_SWITCHES 0x88
#define BIOSMEM_MODESET_CTL 0x89
#define BIOSMEM_DCC_INDEX 0x8A
#define BIOSMEM_CRTCPU_PAGE 0x8A
#define BIOSMEM_VS_POINTER 0xA8

11
src/ints/int10_modes.cpp
View file

@ -184,7 +184,7 @@ static void FinishSetMode(bool clearmem) {
real_writeb(BIOSMEM_SEG,BIOSMEM_MODESET_CTL,real_readb(BIOSMEM_SEG,BIOSMEM_MODESET_CTL)&0x7f);
// FIXME We nearly have the good tables. to be reworked
real_writeb(BIOSMEM_SEG,BIOSMEM_DCC_INDEX,0x08); // 8 is VGA should be ok for now
if (machine==MCH_VGA) real_writeb(BIOSMEM_SEG,BIOSMEM_DCC_INDEX,0x08); // 8 is VGA should be ok for now
real_writew(BIOSMEM_SEG,BIOSMEM_VS_POINTER,0x00);
real_writew(BIOSMEM_SEG,BIOSMEM_VS_POINTER+2,0x00);
@ -246,7 +246,7 @@ bool INT10_SetVideoMode_OTHER(Bitu mode,bool clearmem) {
//Vertical sync position
IO_WriteW(crtc_base,0x07 | (CurMode->vdispend+1) << 8);
//Maximum scanline
Bit8u scanline;
Bit8u scanline,crtpage;
switch(CurMode->type) {
case M_TEXT:
if (machine==MCH_HERC) scanline=14;
@ -296,13 +296,18 @@ bool INT10_SetVideoMode_OTHER(Bitu mode,bool clearmem) {
IO_WriteB(0x3da,0x2);IO_WriteB(0x3de,0x0); //block border
IO_WriteB(0x3da,0x3); //Tandy color overrides?
switch (CurMode->mode) {
case 0x8: case 0x9:
case 0x8:
IO_WriteB(0x3de,0x14);break;
case 0x9:
IO_WriteB(0x3de,0x14);break;
case 0xa:
IO_WriteB(0x3de,0x0c);break;
default:
IO_WriteB(0x3de,0x0);break;
}
crtpage=(CurMode->mode>=0x9) ? 0xf6 : 0x3f;
IO_WriteB(0x3df,crtpage);
real_writeb(BIOSMEM_SEG,BIOSMEM_CRTCPU_PAGE,crtpage);
mode_control=mode_control_list[CurMode->mode];
if (CurMode->mode == 0x6 || CurMode->mode==0xa) color_select=0x3f;
else color_select=0x30;