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Inverted the operation of the OPTi 495 A20 control bit and made the AT keyboard controller (8042) as well as memory default to A20 off - makes both the MR 386 DX and the Award 386 and 486 clones work correctly;

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The Amstrad MegaPC now correctly initializes the internal Paradise WD90C11 graphics card, making the machine work again.
This commit is contained in:
OBattler
2018-01-04 01:57:55 +01:00
parent 412ae3726b
commit 9b2705eb9f
4 changed files with 14 additions and 13 deletions
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10
src/keyboard_at.c
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@@ -8,7 +8,7 @@
*
* Intel 8042 (AT keyboard controller) emulation.
*
* Version: @(#)keyboard_at.c 1.0.13 2018/01/01
* Version: @(#)keyboard_at.c 1.0.14 2018/01/04
*
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
@@ -964,12 +964,12 @@ bad_command:
kbd->mem[0] |= 0x04;
kbd_adddata(0x55);
/*Self-test also resets the output port, enabling A20*/
if (!(kbd->output_port & 0x02)) {
mem_a20_key = 2;
if (kbd->output_port & 0x02) {
mem_a20_key = 0;
mem_a20_recalc();
flushmmucache();
}
kbd->output_port = 0xcf;
kbd->output_port = 0xcd;
break;
case 0xab: /*Interface test*/
@@ -1276,7 +1276,7 @@ kbd_reset(void *priv)
kbd->mem[0] = 0x11;
kbd->default_mode = 0x02;
kbd->wantirq = 0;
kbd->output_port = 0xcf;
kbd->output_port = 0xcd;
kbd->input_port = (MDA) ? 0xf0 : 0xb0;
kbd->out_new = -1;
kbd->last_irq = 0;