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* cia1581d.c - Definitions for the MOS6526 (CIA) chip in the 1581
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* disk drive ($4000). Notice that the real 1581 uses a 8520 CIA.
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* Andreas Boose <viceteam@t-online.de>
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* This file is part of VICE, the Versatile Commodore Emulator.
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* See README for copyright notice.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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#include "drivetypes.h"
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#include "interrupt.h"
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typedef struct drivecia1581_context_s {
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struct drive_s *drive;
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struct iecbus_s *iecbus;
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} drivecia1581_context_t;
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void REGPARM3 cia1581_store(drive_context_t *ctxptr, WORD addr, BYTE data)
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ciacore_store(ctxptr->cia1581, addr, data);
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BYTE REGPARM2 cia1581_read(drive_context_t *ctxptr, WORD addr)
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return ciacore_read(ctxptr->cia1581, addr);
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BYTE REGPARM2 cia1581_peek(drive_context_t *ctxptr, WORD addr)
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return ciacore_peek(ctxptr->cia1581, addr);
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static void cia_set_int_clk(cia_context_t *cia_context, int value, CLOCK clk)
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drive_context_t *drive_context;
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drive_context = (drive_context_t *)(cia_context->context);
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interrupt_set_irq(drive_context->cpu->int_status, cia_context->int_num,
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static void cia_restore_int(cia_context_t *cia_context, int value)
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drive_context_t *drive_context;
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drive_context = (drive_context_t *)(cia_context->context);
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interrupt_restore_irq(drive_context->cpu->int_status,
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cia_context->int_num, value);
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/*************************************************************************
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static void do_reset_cia(cia_context_t *cia_context)
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drivecia1581_context_t *cia1581p;
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cia1581p = (drivecia1581_context_t *)(cia_context->prv);
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cia1581p->drive->led_status = 1;
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static void pulse_ciapc(cia_context_t *cia_context, CLOCK rclk)
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#define PRE_STORE_CIA
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static void undump_ciapa(cia_context_t *cia_context, CLOCK rclk, BYTE b)
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drivecia1581_context_t *cia1581p;
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cia1581p = (drivecia1581_context_t *)(cia_context->prv);
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cia1581p->drive->led_status = (b & 0x40) ? 1 : 0;
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static void undump_ciapb(cia_context_t *cia_context, CLOCK rclk, BYTE b)
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static void store_ciapa(cia_context_t *cia_context, CLOCK rclk, BYTE byte)
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drivecia1581_context_t *cia1581p;
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cia1581p = (drivecia1581_context_t *)(cia_context->prv);
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wd1770[cia1581p->number].side = (byte & 0x01) ? 1 : 0;
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cia1581p->drive->led_status = (byte & 0x40) ? 1 : 0;
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static void store_ciapb(cia_context_t *cia_context, CLOCK rclk, BYTE byte)
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drivecia1581_context_t *cia1581p;
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drive_context_t *drive_context;
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cia1581p = (drivecia1581_context_t *)(cia_context->prv);
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drive_context = (drive_context_t *)(cia_context->context);
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if (byte != cia_context->old_pb) {
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if (cia1581p->iecbus != NULL) {
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BYTE *drive_bus, *drive_data;
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drive_bus = &(cia1581p->iecbus->drv_bus[cia1581p->number + 8]);
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drive_data = &(cia1581p->iecbus->drv_data[cia1581p->number + 8]);
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*drive_bus = ((((*drive_data) << 3) & 0x40)
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| (((*drive_data) << 6)
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& (((*drive_data) | cia1581p->iecbus->cpu_bus) << 3) & 0x80));
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cia1581p->iecbus->cpu_port = cia1581p->iecbus->cpu_bus;
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for (unit = 4; unit < 8+DRIVE_NUM; unit++)
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cia1581p->iecbus->cpu_port
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&= cia1581p->iecbus->drv_bus[unit];
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cia1581p->iecbus->drv_port
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= (((cia1581p->iecbus->cpu_port >> 4) & 0x4)
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| (cia1581p->iecbus->cpu_port >> 7)
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| ((cia1581p->iecbus->cpu_bus << 3) & 0x80));
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iec_drive_write((BYTE)(~byte), cia1581p->number);
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iec_fast_drive_direction(byte & 0x20, cia1581p->number);
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static BYTE read_ciapa(cia_context_t *cia_context)
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drive_context_t *drive_context;
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drivecia1581_context_t *cia1581p;
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cia1581p = (drivecia1581_context_t *)(cia_context->prv);
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drive_context = (drive_context_t *)(cia_context->context);
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tmp = 8 * (cia1581p->number);
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if (!wd1770_disk_change(drive_context))
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return (tmp & ~(cia_context->c_cia[CIA_DDRA]))
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| (cia_context->c_cia[CIA_PRA] & cia_context->c_cia[CIA_DDRA]);
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static BYTE read_ciapb(cia_context_t *cia_context)
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drive_context_t *drive_context;
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drivecia1581_context_t *cia1581p;
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cia1581p = (drivecia1581_context_t *)(cia_context->prv);
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drive_context = (drive_context_t *)(cia_context->context);
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if (cia1581p->iecbus != NULL) {
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drive_port = &(cia1581p->iecbus->drv_port);
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return (((cia_context->c_cia[CIA_PRB] & 0x1a) | (*drive_port)) ^ 0x85)
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| (cia1581p->drive->read_only ? 0 : 0x40);
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return (((cia_context->c_cia[CIA_PRB] & 0x1a)
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| iec_drive_read(cia1581p->number)) ^ 0x85)
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| (cia1581p->drive->read_only ? 0 : 0x40);
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static void read_ciaicr(cia_context_t *cia_context)
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static void read_sdr(cia_context_t *cia_context)
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static void store_sdr(cia_context_t *cia_context, BYTE byte)
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drivecia1581_context_t *cia1581p;
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cia1581p = (drivecia1581_context_t *)(cia_context->prv);
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iec_fast_drive_write(byte, cia1581p->number);
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void cia1581_init(drive_context_t *ctxptr)
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ciacore_init(ctxptr->cia1581, ctxptr->cpu->alarm_context,
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ctxptr->cpu->int_status, ctxptr->cpu->clk_guard);
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void cia1581_setup_context(drive_context_t *ctxptr)
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drivecia1581_context_t *cia1581p;
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ctxptr->cia1581 = lib_calloc(1,sizeof(cia_context_t));
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cia = ctxptr->cia1581;
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cia->prv = lib_malloc(sizeof(drivecia1581_context_t));
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cia1581p = (drivecia1581_context_t *)(cia->prv);
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cia1581p->number = ctxptr->mynumber;
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cia->context = (void *)ctxptr;
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cia->rmw_flag = &(ctxptr->cpu->rmw_flag);
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cia->clk_ptr = ctxptr->clk_ptr;
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cia->todticks = 100000;
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ciacore_setup_context(cia);
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cia->irq_line = IK_IRQ;
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cia->myname = lib_msprintf("CIA1581D%d", ctxptr->mynumber);
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cia1581p->drive = ctxptr->drive;
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cia1581p->iecbus = iecbus_drive_port();
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cia->undump_ciapa = undump_ciapa;
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cia->undump_ciapb = undump_ciapb;
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cia->store_ciapa = store_ciapa;
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cia->store_ciapb = store_ciapb;
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cia->store_sdr = store_sdr;
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cia->read_ciapa = read_ciapa;
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cia->read_ciapb = read_ciapb;
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cia->read_ciaicr = read_ciaicr;
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cia->read_sdr = read_sdr;
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cia->cia_set_int_clk = cia_set_int_clk;
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cia->cia_restore_int = cia_restore_int;
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cia->do_reset_cia = do_reset_cia;
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cia->pulse_ciapc = pulse_ciapc;
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cia->pre_store = NULL;
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cia->pre_read = NULL;
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cia->pre_peek = NULL;