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add basic PCJr graphics functionality based on current Tandy implementation

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2399
This commit is contained in:
Sebastian Strohhäcker 2005-12-02 20:03:51 +00:00
parent 24b045e69f
commit ed1cadea92
7 changed files with 112 additions and 13 deletions
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10
src/ints/int10.cpp
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@ -85,6 +85,11 @@ static Bitu INT10_Handler(void) {
crtcpu=(crtcpu & 0xc0) | (reg_bh & 7) | ((reg_bl & 7) << 3);
break;
}
if (machine==MCH_PCJR) {
/* always return graphics mapping, even for invalid values of AL */
reg_bh=crtcpu & 7;
reg_bl=(crtcpu >> 3) & 0x7;
}
IO_WriteB(0x3df,crtcpu);
real_writeb(BIOSMEM_SEG, BIOSMEM_CRTCPU_PAGE,crtcpu);
}
@ -114,7 +119,10 @@ static Bitu INT10_Handler(void) {
INT10_SetColorSelect(reg_bl);
break;
default:
if(machine == MCH_CGA) INT10_SetColorSelect(reg_bl);
if ((machine==MCH_CGA) || (machine==MCH_PCJR)) {
/* those BIOSes check for !=0 */
INT10_SetColorSelect(reg_bl);
}
break;
}
break;