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need to emulate CARRIER TRANSITION for getty to know a new session starts

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folkert van heusden 2024-04-30 22:01:55 +02:00
parent 271f169df0
commit c70f1503a7
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 10 additions and 13 deletions
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23
dc11.cpp
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@ -33,7 +33,6 @@ dc11::~dc11()
void dc11::trigger_interrupt(const int line_nr)
{
printf("Interrupt %d\r\n", line_nr);
b->getCpu()->queue_interrupt(5, 0300 + line_nr * 4);
}
@ -189,12 +188,9 @@ uint16_t dc11::read_word(const uint16_t addr)
registers[line_nr * 4 + 0] &= ~4; // CD : bit 2
if (pfds[line_nr + dc11_n_lines].fd != -1) {
printf("CARRIER detected\r\n");
registers[line_nr * 4 + 0] |= 1;
registers[line_nr * 4 + 0] |= 4;
}
else
printf("CARRIER *NOT* detected\r\n");
vtemp = registers[line_nr * 4 + 0];
@ -207,7 +203,6 @@ uint16_t dc11::read_word(const uint16_t addr)
// get oldest byte in buffer
if (recv_buffers[line_nr].empty() == false) {
vtemp = *recv_buffers[line_nr].begin();
printf("return: %d\n", vtemp);
// parity check
registers[line_nr * 4 + 0] &= ~(1 << 5);
@ -229,18 +224,14 @@ uint16_t dc11::read_word(const uint16_t addr)
registers[line_nr * 4 + 2] &= ~128; // READY: bit 7
if (pfds[line_nr + dc11_n_lines].fd != -1) {
printf("CARRIER detected\r\n");
registers[line_nr * 4 + 2] |= 2;
registers[line_nr * 4 + 2] |= 128;
}
else
printf("CARRIER *NOT* detected\r\n");
vtemp = registers[line_nr * 4 + 2];
}
DOLOG(debug, true, "DC11: read register %06o (line %d): %06o", addr, line_nr, vtemp);
printf("DC11: read register %06o (line %d): %06o\r\n", addr, line_nr, vtemp);
return vtemp;
}
@ -265,15 +256,21 @@ void dc11::write_word(const uint16_t addr, uint16_t v)
{
int reg = (addr - DC11_BASE) / 2;
int line_nr = reg / 4;
int sub_reg = reg & 3;
DOLOG(debug, true, "DC11: write register %06o (%d line_nr %d) to %06o", addr, reg, line_nr, v);
printf("DC11: write register %06o (%d line_nr %d) to %06o\r\n", addr, reg, line_nr, v);
if ((reg & 3) == 3) { // transmit buffer
if (sub_reg == 3) { // transmit buffer
char c = v & 127;
// TODO handle failed transmit
printf("%ld\r\n", write(pfds[dc11_n_lines + line_nr].fd, &c, 1));
if (write(pfds[dc11_n_lines + line_nr].fd, &c, 1) != 1) {
DOLOG(info, false, "DC11 line %d disconnected\n", line_nr + 1);
registers[line_nr * 4 + 0] |= 0140000; // "ERROR", CARRIER TRANSITION
close(pfds[dc11_n_lines + line_nr].fd);
pfds[dc11_n_lines + line_nr].fd = -1;
}
if (is_tx_interrupt_enabled(line_nr))
trigger_interrupt(line_nr);