valter/dosbox-staging
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Use PCJr specific method to clear the video RAM. Also don't scroll at unspecified video page. Fixes issues with KQ1 and KQ2.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3860
This commit is contained in:
Ralf Grillenberger 2014-06-09 19:07:14 +00:00
parent 7f00bd4b34
commit bb807af8c7
2 changed files with 12 additions and 2 deletions
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3
src/ints/int10_char.cpp
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@ -215,7 +215,8 @@ void INT10_ScrollWindow(Bit8u rul,Bit8u cul,Bit8u rlr,Bit8u clr,Bit8s nlines,Bit
(real_readb(BIOSMEM_SEG, BIOSMEM_CRTCPU_PAGE) >> 3) & 0x7;
base = cpupage << 14;
base += page*real_readw(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE);
if (page!=0xff)
base += page*real_readw(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE);
}
}

11
src/ints/int10_modes.cpp
View file

@ -385,9 +385,18 @@ static void FinishSetMode(bool clearmem) {
/* Clear video memory if needs be */
if (clearmem) {
switch (CurMode->type) {
case M_TANDY16:
if ((machine==MCH_PCJR) && (CurMode->mode >= 9)) {
// PCJR cannot access the full 32k at 0xb800
for (Bit16u ct=0;ct<16*1024;ct++) {
// 0x1800 is the last 32k block in 128k, as set in the CRTCPU_PAGE register
real_writew(0x1800,ct*2,0x0000);
}
break;
}
// fall-through
case M_CGA4:
case M_CGA2:
case M_TANDY16:
for (Bit16u ct=0;ct<16*1024;ct++) {
real_writew( 0xb800,ct*2,0x0000);
}