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This commit is contained in:
waltje
2017-12-04 18:01:01 -05:00
parent cd1abafd13
commit af08e251d3
1 changed files with 86 additions and 40 deletions
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126
src/machine/m_at_4gpv31.c
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@@ -1,6 +1,24 @@
/* Emulation for C&T 82C206 ("NEAT") chipset. */
/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* Emulation for C&T 82C206/82c597 based 4GLX3 board.
*
* NOTE: The NEAT 82c206 code should be moved into a 82c206 module,
* so it can be re-used by other boards.
*
* Version: @(#)m_4gpv31.c 1.0.1 2017/12/04
*
* Author: Fred N. van Kempen, <decwiz@yahoo.com>
* Copyright 2017 Fred N. van Kempen.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "../86box.h"
@@ -8,34 +26,70 @@
#include "machine.h"
static uint8_t neat_regs[256];
static int neat_index;
static int neat_emspage[4];
typedef struct {
uint8_t regs[256];
int indx;
int emspg[4];
} neat_t;
#if NOT_USED
static void
neat_wrems(uint32_t addr, uint8_t val, void *priv)
{
neat_t *dev = (neat_t *)priv;
ram[(dev->emspg[(addr >> 14) & 3] << 14) + (addr & 0x3fff)] = val;
}
static uint8_t
neat_rdems(uint32_t addr, void *priv)
{
neat_t *dev = (neat_t *)priv;
return(ram[(dev->emspg[(addr >> 14) & 3] << 14) + (addr & 0x3fff)]);
}
#endif
static void
neat_write(uint16_t port, uint8_t val, void *priv)
{
neat_t *dev = (neat_t *)priv;
pclog("NEAT: write(%04x, %02x)\n", port, val);
switch (port) {
case 0x22:
neat_index = val;
dev->indx = val;
break;
case 0x23:
neat_regs[neat_index] = val;
switch (neat_index) {
case 0x6E: /*EMS page extension*/
neat_emspage[3] = (neat_emspage[3] & 0x7F) | (( val & 3) << 7);
neat_emspage[2] = (neat_emspage[2] & 0x7F) | (((val >> 2) & 3) << 7);
neat_emspage[1] = (neat_emspage[1] & 0x7F) | (((val >> 4) & 3) << 7);
neat_emspage[0] = (neat_emspage[0] & 0x7F) | (((val >> 6) & 3) << 7);
dev->regs[dev->indx] = val;
switch (dev->indx) {
case 0x6e: /* EMS page extension */
dev->emspg[3] = (dev->emspg[3] & 0x7F) | (( val & 3) << 7);
dev->emspg[2] = (dev->emspg[2] & 0x7F) | (((val >> 2) & 3) << 7);
dev->emspg[1] = (dev->emspg[1] & 0x7F) | (((val >> 4) & 3) << 7);
dev->emspg[0] = (dev->emspg[0] & 0x7F) | (((val >> 6) & 3) << 7);
break;
}
break;
case 0x0208: case 0x0209: case 0x4208: case 0x4209:
case 0x8208: case 0x8209: case 0xC208: case 0xC209:
neat_emspage[port >> 14] = (neat_emspage[port >> 14] & 0x180) | (val & 0x7F);
case 0x0208:
case 0x0209:
case 0x4208:
case 0x4209:
case 0x8208:
case 0x8209:
case 0xc208:
case 0xc209:
dev->emspg[port >> 14] = (dev->emspg[port >> 14] & 0x180) | (val & 0x7F);
break;
}
}
@@ -44,58 +98,50 @@ neat_write(uint16_t port, uint8_t val, void *priv)
static uint8_t
neat_read(uint16_t port, void *priv)
{
neat_t *dev = (neat_t *)priv;
uint8_t ret = 0xff;
switch (port) {
case 0x22:
ret = neat_index;
ret = dev->indx;
break;
case 0x23:
ret = neat_regs[neat_index];
ret = dev->regs[dev->indx];
break;
}
pclog("NEAT: read(%04x) = %02x\n", port, ret);
return(ret);
}
#if NOT_USED
static void
neat_writeems(uint32_t addr, uint8_t val)
{
ram[(neat_emspage[(addr >> 14) & 3] << 14) + (addr & 0x3FFF)] = val;
}
static uint8_t
neat_readems(uint32_t addr)
{
return ram[(neat_emspage[(addr >> 14) & 3] << 14) + (addr & 0x3FFF)];
}
#endif
static void
neat_init(void)
{
neat_t *dev;
dev = (neat_t *)malloc(sizeof(neat_t));
memset(dev, 0x00, sizeof(neat_t));
io_sethandler(0x0022, 2,
neat_read,NULL,NULL, neat_write,NULL,NULL, NULL);
neat_read,NULL,NULL, neat_write,NULL,NULL, dev);
io_sethandler(0x0208, 2,
neat_read,NULL,NULL, neat_write,NULL,NULL, NULL);
neat_read,NULL,NULL, neat_write,NULL,NULL, dev);
io_sethandler(0x4208, 2,
neat_read,NULL,NULL, neat_write,NULL,NULL, NULL);
neat_read,NULL,NULL, neat_write,NULL,NULL, dev);
io_sethandler(0x8208, 2,
neat_read,NULL,NULL, neat_write,NULL,NULL, NULL);
neat_read,NULL,NULL, neat_write,NULL,NULL, dev);
io_sethandler(0xc208, 2,
neat_read,NULL,NULL, neat_write,NULL,NULL, NULL);
neat_read,NULL,NULL, neat_write,NULL,NULL, dev);
}
void
machine_at_4gpv31_init(machine_t *model)
{
machine_at_init(model);
machine_at_ide_init(model);
neat_init();
neat_init();
}