On Fri, Mar 30, 2018 at 7:25 AM, Robert Armstrong via cctalk <cctalk@classiccmp.org> wrote: > > The qt driver, however only works if you have the very late model DELQA > that has "turbo" mode. I think that was called the DETQA, but I'm not sure > about that. If you have an earlier DELQA then the qt driver simply says > "qt0: !Turbo" and quits. Gotta love those terse Un*x error messages! > > The older non-turbo DELQAs and the DESQA (M3127, which is what I have) only > seem to work with the qe driver. It correctly recognizes and identifies them > as a DELQA. I believe the DESQA was identical to the DELQA but with S-box > handles and a built in thinwire transceiver. > > Bob >
Are there any hardware differences between the M7516 non-turbo and the M7516-YM turbo versions of the DELQA, or only firmware differences? Can you convert a non-turbo version into a turbo version just be replacing the firmware EPROM? I just checked and I have at least two M3127 DESQA. The M3127-PA Rev B02 has 23-334E5 / 23-335E5 firmware EPROMs, the M3127-PA Rev D03 has 23-365E5 / 23-366E5 EPROMs. Pete's DECROMs collection says the 23-365E5 / 23-366E5 set is the DELQA-Plus aka Turbo DELQA Ver.2.0.0 set which replaces the 23-334E5 / 23-335E5 set. If you have some spare 27C128 EPROMs you could try burning a 23-365E5 / 23-366E5 set to install in your M3127 DESQA and see if the qt driver is happy with it. I might try that myself eventually when time permits. For the curious about the 2.11BSD "qt0: !Turbo" error message: src\sys\pdpif\if_qt.c: qtturbo(sc) register struct qt_softc *sc; { register int i; register struct qtdevice *addr = sc->addr; struct qt_init *iniblk = (struct qt_init *)SEG5; segm seg5; /* * Issue the software reset. Delay 150us. The board should now be in * DELQA-Normal mode. Set ITB and DEQTA select. If both bits do not * stay turned on then the board is not a DELQA-YM. */ addr->arqr = ARQR_SR; addr->arqr = 0; delay(150L); addr->srr = 0x8001; /* MS | ITB */ i = addr->srr; addr->srr = 0x8000; /* Turn off ITB, set DELQA select */ if (i != 0x8001) { printf("qt@%o !-YM\n", addr); return(0); } /* * Board is a DELQA-YM. Send the commands to enable Turbo mode. Delay * 1 second, testing the SRR register every millisecond to see if the * board has shifted to Turbo mode. */ addr->xcr0 = 0x0baf; addr->xcr1 = 0xff00; for (i = 0; i < 1000; i++) { if ((addr->srr & SRR_RESP) == 1) break; delay(1000L); } if (i >= 1000) { printf("qt@%o !Turbo\n", addr); return(0); }