183 lines
6.2 KiB
C
183 lines
6.2 KiB
C
/* ipb.c: Intel IPB Processor simulator
|
|
|
|
Copyright (c) 2017, William A. Beech
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a
|
|
copy of this software and associated documentation files (the "Software"),
|
|
to deal in the Software without restriction, including without limitation
|
|
the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
and/or sell copies of the Software, and to permit persons to whom the
|
|
Software is furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
|
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
Except as contained in this notice, the name of William A. Beech shall not be
|
|
used in advertising or otherwise to promote the sale, use or other dealings
|
|
in this Software without prior written authorization from William A. Beech.
|
|
|
|
01 Mar 18 - Original file.
|
|
*/
|
|
|
|
#include "system_defs.h"
|
|
|
|
/* function prototypes */
|
|
|
|
t_stat SBC_config(void);
|
|
t_stat SBC_reset (DEVICE *dptr);
|
|
uint8 get_mbyte(uint16 addr);
|
|
uint16 get_mword(uint16 addr);
|
|
void put_mbyte(uint16 addr, uint8 val);
|
|
void put_mword(uint16 addr, uint16 val);
|
|
|
|
/* external function prototypes */
|
|
|
|
extern t_stat i8080_reset (DEVICE *dptr); /* reset the 8080 emulator */
|
|
extern uint8 multibus_get_mbyte(uint16 addr);
|
|
extern void multibus_put_mbyte(uint16 addr, uint8 val);
|
|
extern uint8 EPROM_get_mbyte(uint16 addr, uint8 devnum);
|
|
extern uint8 RAM_get_mbyte(uint16 addr);
|
|
extern void RAM_put_mbyte(uint16 addr, uint8 val);
|
|
extern t_stat i8251_cfg(uint8 base, uint8 devnum);
|
|
extern t_stat i8251_reset(DEVICE *dptr);
|
|
extern t_stat i8253_cfg(uint8 base, uint8 devnum);
|
|
extern t_stat i8253_reset(DEVICE *dptr);
|
|
extern t_stat i8255_cfg(uint8 base, uint8 devnum);
|
|
extern t_stat i8255_reset(DEVICE *dptr);
|
|
extern t_stat i8259_cfg(uint8 base, uint8 devnum);
|
|
extern t_stat i8259_reset(DEVICE *dptr);
|
|
extern t_stat EPROM_reset(DEVICE *dptr);
|
|
extern t_stat RAM_reset(DEVICE *dptr);
|
|
extern t_stat ipc_cont_reset(DEVICE *dptr);
|
|
extern t_stat ipc_cont_cfg(uint8 base, uint8 devnum);
|
|
extern t_stat ioc_cont_reset(DEVICE *dptr);
|
|
extern t_stat ioc_cont_cfg(uint8 base, uint8 devnum);
|
|
extern uint8 reg_dev(uint8 (*routine)(t_bool, uint8, uint8), uint8, uint8);
|
|
extern t_stat EPROM_cfg(uint16 base, uint16 size, uint8 devnum);
|
|
extern t_stat RAM_cfg(uint16 base, uint16 size);
|
|
|
|
/* globals */
|
|
|
|
int onetime = 0;
|
|
|
|
/* extern globals */
|
|
|
|
extern uint16 PCX; /* program counter */
|
|
extern uint8 xack; /* XACK signal */
|
|
extern UNIT i8255_unit;
|
|
extern UNIT EPROM_unit;
|
|
extern UNIT RAM_unit;
|
|
extern UNIT ipc_cont_unit;
|
|
extern UNIT ioc_cont_unit;
|
|
extern DEVICE i8080_dev;
|
|
extern DEVICE i8251_dev;
|
|
extern DEVICE i8253_dev;
|
|
extern DEVICE i8255_dev;
|
|
extern DEVICE i8259_dev;
|
|
extern DEVICE ipc_cont_dev;
|
|
extern DEVICE ioc_cont_dev;
|
|
|
|
t_stat SBC_config(void)
|
|
{
|
|
sim_printf("Configuring IPB SBC\n Onboard Devices:\n");
|
|
i8251_cfg(I8251_BASE_0, 0);
|
|
i8251_cfg(I8251_BASE_1, 1);
|
|
i8253_cfg(I8253_BASE, 0);
|
|
i8255_cfg(I8255_BASE_0, 0);
|
|
i8255_cfg(I8255_BASE_1, 1);
|
|
i8259_cfg(I8259_BASE_0, 0);
|
|
i8259_cfg(I8259_BASE_1, 1);
|
|
ipc_cont_cfg(ICONT_BASE, 0);
|
|
ioc_cont_cfg(DBB_BASE, 0);
|
|
EPROM_cfg(ROM_BASE, ROM_SIZE, 0);
|
|
RAM_cfg(RAM_BASE, RAM_SIZE);
|
|
return SCPE_OK;
|
|
}
|
|
|
|
/* CPU reset routine
|
|
put here to cause a reset of the entire IPC system */
|
|
|
|
t_stat SBC_reset (DEVICE *dptr)
|
|
{
|
|
if (onetime == 0) {
|
|
SBC_config();
|
|
onetime++;
|
|
}
|
|
i8080_reset(&i8080_dev);
|
|
i8251_reset(&i8251_dev);
|
|
i8253_reset(&i8253_dev);
|
|
i8255_reset(&i8255_dev);
|
|
i8259_reset(&i8259_dev);
|
|
ipc_cont_reset(&ipc_cont_dev);
|
|
ioc_cont_reset(&ioc_cont_dev);
|
|
return SCPE_OK;
|
|
}
|
|
|
|
/* get a byte from memory - handle RAM, ROM and Multibus memory */
|
|
|
|
uint8 get_mbyte(uint16 addr)
|
|
{
|
|
SET_XACK(0); /* set XACK */
|
|
if (addr >= 0xF800) { //monitor ROM - always there
|
|
return EPROM_get_mbyte(addr - 0xF000, 0); //top half of EPROM
|
|
}
|
|
if ((addr < 0x1000) && ((ipc_cont_unit.u3 & 0x04) == 0)) { //startup
|
|
return EPROM_get_mbyte(addr, 0); //top half of EPROM for boot
|
|
}
|
|
if ((addr >= 0xE800) && (addr < 0xF000) && ((ipc_cont_unit.u3 & 0x10) == 0)) { //diagnostic ROM
|
|
return EPROM_get_mbyte(addr - 0xE800, 0); //bottom half of EPROM
|
|
}
|
|
if (addr < 0x8000) { //IPB RAM
|
|
return RAM_get_mbyte(addr);
|
|
}
|
|
return multibus_get_mbyte(addr); //check multibus cards
|
|
}
|
|
|
|
/* get a word from memory */
|
|
|
|
uint16 get_mword(uint16 addr)
|
|
{
|
|
uint16 val;
|
|
|
|
val = get_mbyte(addr);
|
|
val |= (get_mbyte(addr+1) << 8);
|
|
return val;
|
|
}
|
|
|
|
/* put a byte to memory - handle RAM, ROM and Multibus memory */
|
|
|
|
void put_mbyte(uint16 addr, uint8 val)
|
|
{
|
|
SET_XACK(0); /* set no XACK */
|
|
if (addr >= 0xF800) { //monitor ROM - always there
|
|
return; //do nothing
|
|
}
|
|
if ((addr < 0x1000) && ((ipc_cont_unit.u3 & 0x04) == 0)) { //startup
|
|
return; //do nothing
|
|
}
|
|
if ((addr >= 0xE800) && (addr < 0xF000) && ((ipc_cont_unit.u3 & 0x10) == 0)) { //diagnostic ROM
|
|
return; //do nothing
|
|
}
|
|
if (addr < 0x8000) {
|
|
RAM_put_mbyte(addr, val); //IPB RAM
|
|
return;
|
|
}
|
|
multibus_put_mbyte(addr, val); //check multibus cards
|
|
}
|
|
|
|
/* put a word to memory */
|
|
|
|
void put_mword(uint16 addr, uint16 val)
|
|
{
|
|
put_mbyte(addr, val & 0xff);
|
|
put_mbyte(addr+1, val >> 8);
|
|
}
|
|
|
|
/* end of ipb.c */
|