Looking at the Sysid messages generated by the QNA/LQA emulation when in LQA
mode, I see some stuff that doesn't match the spec.
The code has this in xq_system_id:
/* DEVICE TYPE */
msg[40] = 37; /* type */
msg[41] = 0x00; /* type */
msg[42] = 0x01; /* length */
msg[43] = 0x11; /* value (0x11=DELQA) */
if (xq->var->type == XQ_T_DELQA_PLUS) /* DELQA-T has different Device ID */
msg[43] = 0x4B; /* value (0x4B(75)=DELQA-T) */
Type code 37 is not defined in the MOP spec. The type code for data item
"device type" is 100.
I checked the device code values against the Phase V MOP spec (the Phase IV one
is too old to have these codes). It says that type value x11 (17 decimal) is
"LANCE/DECserver100 CSMA/CD communication link". There are two entries for
DELQA, 31 and 37 decimal, which refer to a note that says:
"Note on the assignment for the DELQA: the primary assignment is 37. Device
code 31 is used in early DELQA devices when used on PDP-11 systems, in the
“Request Program” message only. Later revisions of the DELQA use code 37
throughout. Software shall treat codes 31 and 37 as equivalent."
So it seems that 31 is a mistake built into some PDP11 boot ROMs, and the
built-in SYSID code has always been 37 decimal.
paul
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