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