65 lines
1,006 B
C++
65 lines
1,006 B
C++
// (C) 2024 by Folkert van Heusden
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// Released under MIT license
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#include "bus.h"
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#include "dc11.h"
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dc11::dc11(bus *const b): b(b)
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{
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}
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dc11::~dc11()
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{
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stop_flag = true;
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}
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void dc11::reset()
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{
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}
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uint8_t dc11::read_byte(const uint16_t addr)
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{
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uint16_t v = read_word(addr & ~1);
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if (addr & 1)
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return v >> 8;
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return v;
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}
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uint16_t dc11::read_word(const uint16_t addr)
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{
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const int reg = (addr - DC11_BASE) / 2;
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uint16_t vtemp = registers[reg];
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DOLOG(debug, false, "DC11: read register %06o (%d): %06o", addr, reg, vtemp);
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return vtemp;
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}
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void dc11::write_byte(const uint16_t addr, const uint8_t v)
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{
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uint16_t vtemp = registers[(addr - DC11_BASE) / 2];
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if (addr & 1) {
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vtemp &= ~0xff00;
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vtemp |= v << 8;
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}
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else {
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vtemp &= ~0x00ff;
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vtemp |= v;
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}
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write_word(addr, vtemp);
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}
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void dc11::write_word(const uint16_t addr, uint16_t v)
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{
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const int reg = (addr - DC11_BASE) / 2;
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DOLOG(debug, false, "DC11: set register %06o (%d) to %o", addr, reg, v);
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registers[reg] = v;
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}
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