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1. Inverse space kludge

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2. If no VBL return value is no longer fixed at zero
This commit is contained in:
mpohoreski 2006-03-09 21:42:17 +00:00
parent 52016a8744
commit 3c0ae9133c
1 changed files with 10 additions and 3 deletions
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13
source/Video.cpp
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@ -938,7 +938,12 @@ BOOL Update40ColCell (int x, int y, int xpixel, int ypixel, int offset)
if(bCharChanged || (bCharFlashing && g_bTextFlashFlag))
{
bool bInvert = bCharFlashing ? g_bTextFlashState : false;
// Apple ][ inits memory to FF,FF,00,00
// The 7F char is same as (inverse) space
if (ch == 0xFF)
ch = 32;
CopySource(xpixel,ypixel,
14,16,
SRCOFFS_40COL+((ch & 0x0F) << 4),
@ -1507,10 +1512,12 @@ BYTE __stdcall VideoCheckVbl (WORD, BYTE, BYTE, BYTE, ULONG)
69DA D0 F7 BNE $68DE
// Karateka expects < 80
// Returns 00 or FF on Apple ][
07DE AD 19 C0 LDA RDVBLBAR
07E1 30 FB BMI $7DE
77A1 AD 19 C0 LDA RDVBLBAR
77A4 30 FB BMI $7DE
// Gumball expects non-zero low-nibble on VBL
BBB5 A5 60 LDA $60
BBB7 4D 50 C0 EOR TXTCLR
@ -1523,7 +1530,7 @@ BYTE __stdcall VideoCheckVbl (WORD, BYTE, BYTE, BYTE, ULONG)
// return MemReturnRandomData(dwVBlCounter <= nVBlStop_NTSC);
if (dwVBlCounter <= nVBlStop_NTSC)
return 0x00;
return (BYTE)(dwVBlCounter & 0x7F); // 0x00;
else
return 0x80 | ((BYTE)(dwVBlCounter & 1));
}