118 lines
2.1 KiB
C++
118 lines
2.1 KiB
C++
// (C) 2018-2023 by Folkert van Heusden
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// // Released under Apache License v2.0
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "tty.h"
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#include "cpu.h"
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#include "gen.h"
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#include "log.h"
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#include "memory.h"
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#include "utils.h"
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const char * const regnames[] = {
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"reader status ",
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"reader buffer ",
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"puncher status",
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"puncher buffer"
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};
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tty::tty(console *const c, bus *const b) :
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c(c),
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b(b)
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{
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}
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tty::~tty()
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{
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}
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uint8_t tty::readByte(const uint16_t addr)
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{
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uint16_t v = readWord(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 tty::readWord(const uint16_t addr)
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{
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const int reg = (addr - PDP11TTY_BASE) / 2;
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uint16_t vtemp = registers[reg];
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if (have_char_1) {
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have_char_1 = false;
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have_char_2 = true;
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}
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else if (have_char_2 == false) {
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have_char_1 = c->poll_char();
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}
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if (addr == PDP11TTY_TKS) {
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vtemp = (have_char_2 ? 1 << 7 : 0) | (have_char_1 ? 1 << 11 : 0);
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}
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else if (addr == PDP11TTY_TKB) {
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if (have_char_2) {
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uint8_t ch = c->get_char();
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vtemp = ch | (parity(ch) << 7);
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have_char_2 = false;
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}
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else {
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vtemp = 0;
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}
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}
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else if (addr == PDP11TTY_TPS) {
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vtemp |= 128;
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}
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DOLOG(debug, true, "PDP11TTY read addr %o (%s): %d, 7bit: %d", addr, regnames[reg], vtemp, vtemp & 127);
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registers[reg] = vtemp;
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return vtemp;
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}
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void tty::writeByte(const uint16_t addr, const uint8_t v)
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{
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uint16_t vtemp = registers[(addr - PDP11TTY_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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writeWord(addr, vtemp);
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}
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void tty::writeWord(const uint16_t addr, uint16_t v)
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{
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const int reg = (addr - PDP11TTY_BASE) / 2;
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DOLOG(debug, true, "PDP11TTY write %o (%s): %o", addr, regnames[reg], v);
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if (addr == PDP11TTY_TPB) {
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char ch = v & 127;
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DOLOG(debug, true, "PDP11TTY print '%c'", ch);
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c->put_char(ch);
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registers[(PDP11TTY_TPS - PDP11TTY_BASE) / 2] |= 128;
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if (registers[(PDP11TTY_TPS - PDP11TTY_BASE) / 2] & 64)
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b->getCpu()->queue_interrupt(4, 064);
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}
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DOLOG(debug, true, "set register %o to %o", addr, v);
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registers[(addr - PDP11TTY_BASE) / 2] = v;
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}
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