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Ported over the VARCem NVR commit.

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OBattler
2018-03-13 03:46:10 +01:00
parent 4ca7abf6fe
commit ddcb901421
22 changed files with 4206 additions and 2397 deletions
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262
src/machine/m_at_t3100e.c
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@@ -1,9 +1,155 @@
/*
* VARCem Virtual ARchaeological Computer EMulator.
* An emulator of (mostly) x86-based PC systems and devices,
* using the ISA,EISA,VLB,MCA and PCI system buses, roughly
* spanning the era between 1981 and 1995.
*
* This file is part of the VARCem Project.
*
* Implementation of the Toshiba T3100e.
*
* The Toshiba 3100e is a 286-based portable.
*
* To bring up the BIOS setup screen hold down the 'Fn' key
* on booting.
*
* Memory management
* ~~~~~~~~~~~~~~~~~
*
* Motherboard memory is divided into:
* - Conventional memory: Either 512k or 640k
* - Upper memory: Either 512k or 384k, depending on
* amount of conventional memory.
* Upper memory can be used as EMS or XMS.
* - High memory: 0-4Mb, depending on RAM installed.
* The BIOS setup screen allows some or
* all of this to be used as EMS; the
* remainder is XMS.
*
* Additional memory (either EMS or XMS) can also be provided
* by ISA expansion cards.
*
* Under test in PCem, the BIOS will boot with up to 65368Kb
* of memory in total (16Mb less 16k). However it will give
* an error with RAM sizes above 8Mb, if any of the high
* memory is allocated as EMS, because the builtin EMS page
* registers can only access up to 8Mb.
*
* Memory is controlled by writes to I/O port 8084h:
* Bit 7: Always 0 }
* Bit 6: Always 1 } These bits select which motherboard
* Bit 5: Always 0 } function to access.
* Bit 4: Set to treat upper RAM as XMS
* Bit 3: Enable external RAM boards?
* Bit 2: Set for 640k conventional memory, clear for 512k
* Bit 1: Enable RAM beyond 1Mb.
* Bit 0: Enable EMS.
*
* The last value written to this port is saved at 0040:0093h,
* and in CMOS memory at offset 0x37. If the top bit of the
* CMOS byte is set, then high memory is being provided by
* an add-on card rather than the mainboard; accordingly,
* the BIOS will not allow high memory to be used as EMS.
*
* EMS is controlled by 16 page registers:
*
* Page mapped at 0xD000 0xD400 0xD800 0xDC00
* ------------------------------------------------------
* Pages 0x00-0x7F 0x208 0x4208 0x8208 0xc208
* Pages 0x80-0xFF 0x218 0x4218 0x8218 0xc218
* Pages 0x100-0x17F 0x258 0x4258 0x8258 0xc258
* Pages 0x180-0x1FF 0x268 0x4268 0x8268 0xc268
*
* The value written has bit 7 set to enable EMS, reset to
* disable it.
*
* So:
* OUT 0x208, 0x80 will page in the first 16k page at 0xD0000.
* OUT 0x208, 0x00 will page out EMS, leaving nothing at 0xD0000.
* OUT 0x4208, 0x80 will page in the first 16k page at 0xD4000.
* OUT 0x218, 0x80 will page in the 129th 16k page at 0xD0000.
* etc.
*
* To use EMS from DOS, you will need the Toshiba EMS driver
* (TOSHEMM.ZIP). This supports the above system, plus further
* ranges of ports at 0x_2A8, 0x_2B8, 0x_2C8.
*
* Features not implemented:
* > Four video fonts.
* > BIOS-controlled mapping of serial ports to IRQs.
* > Custom keyboard controller. This has a number of extra
* commands in the 0xB0-0xBC range, for such things as turbo
* on/off, and switching the keyboard between AT and PS/2
* modes. Currently I have only implemented command 0xBB,
* so that self-test completes successfully. Commands include:
*
* 0xB0: Turbo on
* 0xB1: Turbo off
* 0xB2: Internal display on?
* 0xB3: Internal display off?
* 0xB5: Get settings byte (bottom bit is color/mono setting)
* 0xB6: Set settings byte
* 0xB7: Behave as 101-key PS/2 keyboard
* 0xB8: Behave as 84-key AT keyboard
* 0xBB: Return a byte, bit 2 is Fn key state, other bits unknown.
*
* The other main I/O port needed to POST is:
* 0x8084: System control.
* Top 3 bits give command, bottom 5 bits give parameters.
* 000 => set serial port IRQ / addresses
* bit 4: IRQ5 serial port base: 1 => 0x338, 0 => 0x3E8
* bits 3, 2, 0 specify serial IRQs for COM1, COM2, COM3:
* 00 0 => 4, 3, 5
* 00 1 => 4, 5, 3
* 01 0 => 3, 4, 5
* 01 1 => 3, 5, 4
* 10 0 => 4, -, 3
* 10 1 => 3, -, 4
* 010 => set memory mappings
* bit 4 set if upper RAM is XMS
* bit 3 enable add-on memory boards beyond 5Mb?
* bit 2 set for 640k sysram, clear for 512k sysram
* bit 1 enable mainboard XMS
* bit 0 enable mainboard EMS
* 100 => set parallel mode / LCD settings
* bit 4 set for bidirectional parallel port
* bit 3 set to disable internal CGA
* bit 2 set for single-pixel LCD font
* bits 0,1 for display font
*
* Version: @(#)m_at_t3100e.c 1.0.3 2018/03/05
*
* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
* Miran Grca, <mgrca8@gmail.com>
* Sarah Walker, <tommowalker@tommowalker.co.uk>
*
* Copyright 2017,2018 Fred N. van Kempen.
* Copyright 2016-2018 Miran Grca.
* Copyright 2008-2018 Sarah Walker.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the:
*
* Free Software Foundation, Inc.
* 59 Temple Place - Suite 330
* Boston, MA 02111-1307
* USA.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "../86box.h"
#include "../io.h"
#include "../mouse.h"
@@ -13,124 +159,18 @@
#include "../cpu/cpu.h"
#include "../floppy/fdd.h"
#include "../floppy/fdc.h"
#include "../video/vid_t3100e.h"
#include "machine.h"
#include "m_at_t3100e.h"
/* The Toshiba 3100e is a 286-based portable.
*
* To bring up the BIOS setup screen hold down the 'Fn' key on booting
*
* Memory management
* ~~~~~~~~~~~~~~~~~
*
* Motherboard memory is divided into:
* - Conventional memory: Either 512k or 640k
* - Upper memory: Either 512k or 384k, depending on amount of
* conventional memory. Upper memory can be
* used either as EMS or XMS.
* - High memory: 0-4Mb, depending on RAM installed. The BIOS
* setup screen allows some or all of this to be
* used as EMS; the remainder is XMS.
*
* Additional memory (either EMS or XMS) can also be provided by ISA
* expansion cards.
*
* Under test in PCEM, the BIOS will boot with up to 65368Kb of memory in
* total (16Mb less 16k). However it will give an error with RAM sizes
* above 8Mb, if any of the high memory is allocated as EMS, because the
* builtin EMS page registers can only access up to 8Mb.
*
* Memory is controlled by writes to I/O port 8084h:
* Bit 7: Always 0 }
* Bit 6: Always 1 } These bits select which motherboard function to
* Bit 5: Always 0 } access.
* Bit 4: Set to treat upper RAM as XMS
* Bit 3: Enable external RAM boards?
* Bit 2: Set for 640k conventional memory, clear for 512k
* Bit 1: Enable RAM beyond 1Mb.
* Bit 0: Enable EMS.
*
* The last value written to this port is saved at 0040:0093h, and in
* CMOS memory at offset 0x37. If the top bit of the CMOS byte is set,
* then high memory is being provided by an add-on card rather than the
* mainboard; accordingly, the BIOS will not allow high memory to be
* used as EMS.
*
* EMS is controlled by 16 page registers:
*
* Page mapped at 0xD000 0xD400 0xD800 0xDC00
* ------------------------------------------------------
* Pages 0x00-0x7F 0x208 0x4208 0x8208 0xc208
* Pages 0x80-0xFF 0x218 0x4218 0x8218 0xc218
* Pages 0x100-0x17F 0x258 0x4258 0x8258 0xc258
* Pages 0x180-0x1FF 0x268 0x4268 0x8268 0xc268
*
* The value written has bit 7 set to enable EMS, reset to disable it.
*
* So: OUT 0x208, 0x80 will page in the first 16k page at 0xD0000.
* OUT 0x208, 0x00 will page out EMS, leaving nothing at 0xD0000.
* OUT 0x4208, 0x80 will page in the first 16k page at 0xD4000.
* OUT 0x218, 0x80 will page in the 129th 16k page at 0xD0000.
*
* etc.
*
* To use EMS from DOS, you will need the Toshiba EMS driver (TOSHEMM.ZIP).
* This supports the above system, plus further ranges of ports at
* 0x_2A8, 0x_2B8, 0x_2C8.
*
*/
static const int t3100e_log = 0;
extern uint8_t *ram; /* Physical RAM */
/* Features not implemented:
* > Four video fonts.
* > BIOS-controlled mapping of serial ports to IRQs.
* > Custom keyboard controller. This has a number of extra commands in the
* 0xB0-0xBC range, for such things as turbo on/off, and switching the
* keyboard between AT and PS/2 modes. Currently I have only implemented
* command 0xBB, so that self-test completes successfully. Commands include:
*
* 0xB0: Turbo on
* 0xB1: Turbo off
* 0xB2: Internal display on?
* 0xB3: Internal display off?
* 0xB5: Get settings byte (bottom bit is colour / mono setting)
* 0xB6: Set settings byte
* 0xB7: Behave as 101-key PS/2 keyboard
* 0xB8: Behave as 84-key AT keyboard
* 0xBB: Return a byte, bit 2 is Fn key state, other bits unknown.
*
* The other main I/O port needed to POST is:
* 0x8084: System control.
* Top 3 bits give command, bottom 5 bits give parameters.
* 000 => set serial port IRQ / addresses
* bit 4: IRQ5 serial port base: 1 => 0x338, 0 => 0x3E8
* bits 3, 2, 0 specify serial IRQs for COM1, COM2, COM3:
* 00 0 => 4, 3, 5
* 00 1 => 4, 5, 3
* 01 0 => 3, 4, 5
* 01 1 => 3, 5, 4
* 10 0 => 4, -, 3
* 10 1 => 3, -, 4
* 010 => set memory mappings
* bit 4 set if upper RAM is XMS
* bit 3 enable add-on memory boards beyond 5Mb?
* bit 2 set for 640k sysram, clear for 512k sysram
* bit 1 enable mainboard XMS
* bit 0 enable mainboard EMS
* 100 => set parallel mode / LCD settings
* bit 4 set for bidirectional parallel port
* bit 3 set to disable internal CGA
* bit 2 set for single-pixel LCD font
* bits 0,1 for display font
*/
void at_init();
static const int t3100e_log = 0;
/* The T3100e motherboard can (and does) dynamically reassign RAM between
* conventional, XMS and EMS. This translates to monkeying with the mappings.
*/