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Ported the ISA RTC and Memory expansion cards from VARCem's.

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Bunch of improvements in the device, memory and MMU handling.
Re-worked the NEAT 286 chipset (ported from VARCem).
Re-worked the ATI 28800 a bit, added Sierra SC1502x ramdac to VGA Wonder XL (Compaq) since it supports such.
Top 384K memory handling improvements (256K top memory too)
Added MCA version of MPU-401 (not tested much, however).
Re-worked the SCAT 286 chipset.
This commit is contained in:
TC1995
2018-09-03 13:55:09 +02:00
parent 0e96d5d7a4
commit 0d2ee0a57d
29 changed files with 3605 additions and 422 deletions
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6
src/machine/m_at_scat.c
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@@ -10,7 +10,7 @@
*
* Re-worked version based on the 82C235 datasheet and errata.
*
* Version: @(#)m_at_scat.c 1.0.15 2018/04/29
* Version: @(#)m_at_scat.c 1.0.16 2018/09/02
*
* Authors: Original by GreatPsycho for PCem.
* Fred N. van Kempen, <decwiz@yahoo.com>
@@ -1259,7 +1259,6 @@ scat_init()
scat_port_92 = 0;
mem_mapping_disable(&ram_low_mapping);
mem_mapping_disable(&ram_mid_mapping);
mem_mapping_disable(&ram_high_mapping);
for (i = 0; i < 4; i++)
mem_mapping_disable(&bios_mapping[i]);
@@ -1282,8 +1281,6 @@ scat_init()
mem_mapping_add(&scat_ems_mapping[i], (i + (i >= 24 ? 28 : 16)) << 14, 0x04000, mem_read_scatb, mem_read_scatw, mem_read_scatl, mem_write_scatb, mem_write_scatw, mem_write_scatl, ram + ((i + (i >= 24 ? 28 : 16)) << 14), 0, &scat_stat[i]);
}
for(i=4;i<10;i++) isram[i] = 0;
for (i = (scat_regs[SCAT_VERSION] < 4 ? 0 : 8); i < 16; i++) {
mem_mapping_add(&scat_high_mapping[i], (i << 14) + 0xFC0000, 0x04000, mem_read_bios, mem_read_biosw, mem_read_biosl, mem_write_null, mem_write_nullw, mem_write_nulll, rom + ((i << 14) & biosmask), 0, NULL);
mem_mapping_enable(&scat_high_mapping[i]);
@@ -1333,7 +1330,6 @@ scatsx_init()
scat_port_92 = 0;
mem_mapping_disable(&ram_low_mapping);
mem_mapping_disable(&ram_mid_mapping);
mem_mapping_disable(&ram_high_mapping);
for (i = 0; i < 4; i++)
mem_mapping_disable(&bios_mapping[i]);