104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/* Copyright holders: Sarah Walker
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see COPYING for more details
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*/
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#include "ibm.h"
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#include "disc.h"
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#include "fdc.h"
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#include "io.h"
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#include "mem.h"
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#include "serial.h"
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#include "wd76c10.h"
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static uint16_t wd76c10_0092;
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static uint16_t wd76c10_2072;
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static uint16_t wd76c10_2872;
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static uint16_t wd76c10_5872;
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uint16_t wd76c10_read(uint16_t port, void *priv)
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{
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switch (port)
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{
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case 0x0092:
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return wd76c10_0092;
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case 0x2072:
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return wd76c10_2072;
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case 0x2872:
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return wd76c10_2872;
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case 0x5872:
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return wd76c10_5872;
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}
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return 0;
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}
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void wd76c10_write(uint16_t port, uint16_t val, void *priv)
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{
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pclog("WD76C10 write %04X %04X\n", port, val);
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switch (port)
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{
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case 0x0092:
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wd76c10_0092 = val;
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mem_a20_alt = val & 2;
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mem_a20_recalc();
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break;
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case 0x2072:
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wd76c10_2072 = val;
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switch ((val >> 5) & 7)
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{
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case 1: serial1_set(0x3f8, 4); break;
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case 2: serial1_set(0x2f8, 4); break;
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case 3: serial1_set(0x3e8, 4); break;
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case 4: serial1_set(0x2e8, 4); break;
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}
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switch ((val >> 1) & 7)
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{
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case 1: serial2_set(0x3f8, 3); break;
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case 2: serial2_set(0x2f8, 3); break;
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case 3: serial2_set(0x3e8, 3); break;
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case 4: serial2_set(0x2e8, 3); break;
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}
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break;
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case 0x2872:
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wd76c10_2872 = val;
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fdc_remove();
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if (!(val & 1))
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fdc_add();
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break;
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case 0x5872:
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wd76c10_5872 = val;
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break;
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}
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}
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uint8_t wd76c10_readb(uint16_t port, void *priv)
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{
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if (port & 1)
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return wd76c10_read(port & ~1, priv) >> 8;
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return wd76c10_read(port, priv) & 0xff;
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}
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void wd76c10_writeb(uint16_t port, uint8_t val, void *priv)
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{
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uint16_t temp = wd76c10_read(port, priv);
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if (port & 1)
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wd76c10_write(port & ~1, (temp & 0x00ff) | (val << 8), priv);
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else
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wd76c10_write(port , (temp & 0xff00) | val, priv);
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}
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void wd76c10_init()
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{
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io_sethandler(0x0092, 0x0002, wd76c10_readb, wd76c10_read, NULL, wd76c10_writeb, wd76c10_write, NULL, NULL);
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io_sethandler(0x2072, 0x0002, wd76c10_readb, wd76c10_read, NULL, wd76c10_writeb, wd76c10_write, NULL, NULL);
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io_sethandler(0x2872, 0x0002, wd76c10_readb, wd76c10_read, NULL, wd76c10_writeb, wd76c10_write, NULL, NULL);
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io_sethandler(0x5872, 0x0002, wd76c10_readb, wd76c10_read, NULL, wd76c10_writeb, wd76c10_write, NULL, NULL);
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}
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