CONSOLE: Add general support for SET CONSOLE SPEED=nnn

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The original SET CONSOLE SPEED=nnn was added to a allow direct wired
terminal connected to a host system serial port to be a simulator's console.
The current change generalizes all console I/O such that speed is a reliable
option for direct console connections as well as serial and telnet connections.

The simple recipe to get well behaved console output speed is:
1) call tmxr_set_console_units() in the reset routine of the console DEVICE.
2) In the code path that engages console output do something similar
    to this as appropriate for the system being simulated:
        void txdb_wr (int32 data)
        {
        tto_unit.buf = data & 0377;
        tto_csr = tto_csr & ~CSR_DONE;
        CLR_INT (TTO);
        sim_activate (&tto_unit, tto_unit.wait);
        }

3) In the output unit's service routine the console output unit's service
    routine do something similar to this as appropriate for the system
    being simulated:
        t_stat tto_svc (UNIT *uptr)
        {
        int32 c;

        c = sim_tt_outcvt (tto_unit.buf, TT_GET_MODE (uptr->flags));
        if (c >= 0) {
            t_stat r;

            if ((r = sim_putchar_s (c)) != SCPE_OK) {           /* output; error? */
                sim_activate (uptr, uptr->wait);                /* retry */
                return ((r == SCPE_STALL)? SCPE_OK: r);         /* !stall? report */
                }
            }
        tto_csr = tto_csr | CSR_DONE;
        if (tto_csr & CSR_IE)
        SET_INT (TTO);
        }
The almost all of the current simh simulators already are implemented
with logic like the above example.  These will work just fine with the
newly regulated console speed.

...

This commit is contained in:

Mark Pizzolato

2025-06-24 09:57:49 -10:00

parent e1d0f3b267

commit 912f421144

6 changed files with 86 additions and 46 deletions

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