folkert/KEK
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

need to emulate RING INDICATOR/CARRIER TRANSITION for getty to wakeup

Browse source
This commit is contained in:
folkert van heusden 2024-04-30 21:56:33 +02:00
parent aabff63ddb
commit 271f169df0
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 38 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

52
dc11.cpp
View file

@ -107,6 +107,10 @@ void dc11::operator()()
}
pfds[client_i].fd = accept(pfds[i].fd, nullptr, nullptr);
registers[i * 4 + 0] |= 0160000; // "ERROR", RING INDICATOR, CARRIER TRANSITION
if (is_rx_interrupt_enabled(i))
trigger_interrupt(i);
}
// receive data
@ -175,23 +179,29 @@ uint16_t dc11::read_word(const uint16_t addr)
{
int reg = (addr - DC11_BASE) / 2;
int line_nr = reg / 4;
// emulate DTR, CTS & READY
registers[line_nr * 4 + 0] &= ~1; // DTR: bit 0 [RCSR]
registers[line_nr * 4 + 0] &= ~4; // CD : bit 2
registers[line_nr * 4 + 2] &= ~2; // CTS: bit 1 [TSCR]
registers[line_nr * 4 + 2] &= ~128; // READY: bit 7
if (pfds[line_nr + dc11_n_lines].fd != -1) {
registers[line_nr * 4 + 0] |= 1;
registers[line_nr * 4 + 0] |= 4;
registers[line_nr * 4 + 2] |= 2;
registers[line_nr * 4 + 2] |= 128;
}
int sub_reg = reg & 3;
uint16_t vtemp = registers[reg];
if ((reg & 3) == 1) { // read data register
if (sub_reg == 0) { // recive status
// emulate DTR, CTS & READY
registers[line_nr * 4 + 0] &= ~1; // DTR: bit 0 [RCSR]
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];
// clear error(s)
registers[line_nr * 4 + 0] &= ~0160000;
}
else if (sub_reg == 1) { // read data register
std::unique_lock<std::mutex> lck(input_lock[line_nr]);
// get oldest byte in buffer
@ -214,6 +224,20 @@ uint16_t dc11::read_word(const uint16_t addr)
}
}
}
else if (sub_reg == 2) { // transmit status
registers[line_nr * 4 + 2] &= ~2; // CTS: bit 1 [TSCR]
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);