Boot proms and types

82S131 Am27S13 63S241 74S571 (512x4-TS) & 82S129 (256x4-TS)	(DL) RL01/02 cartridge disk	23-751A9	0x0698	SRC LST	(1,2)
	(DM) RK06/07 cartridge disk	23-752A9	0x0627	SRC LST	(1,2)
	(DX) RX01 floppy disk, single density	23-753A9	0x066D	SRC LST	(2)
	(DP) RP02/03 cartridge disk (DB) RP04/05/06,RM02/03/05 cartridge disk	23-755A9	0x0622	SRC LST	(1,2)
	(DK) RK03/05 DECdisk (DT) TU55/56 DECtape	23-756A9	0x0613	SRC LST	(1,2)
	(MM) TU16/45/77,TE16 magtape	23-757A9	0x06F2	SRC LST	(1,2)
	(MT) TS03,TU10,TE10 magtape	23-758A9	0x06DC	SRC LST	(1,2)
	(DS) RS03/04 fixed disk	23-759A9	0x04BC	SRC LST	(2)
	(TT) ASR33 lowspeed reader (PR) PC05 hispeed reader	23-760A9	0x0681	SRC LST	(1,2)
	(CT) TU60 DECcassette	23-761A9	0x05E2	SRC LST	(2)
	(RS) RS11/64 fixed disk	23-762A9	-	-	(4)
	(CR) CR11 card reader	23-763A9	-	-	(4)
	(MS) TS04/11,TU80,TSU05 tape	23-764A9	0x06E1	SRC LST	(2)
	(DD) TU58 DECtapeII	23-765A9	0x0603	SRC LST	(2)
	(DD) TU58 DECtapeII; fixes non-std CSR access	23-765B9	0x05BC	SRC LST	(5)
	(DU) MSCP UDA50(RAxx) disk	23-767A9	0x0677	SRC LST	(1)
	(DY) RX02 floppy disk, double density	23-811A9	0x0646	SRC LST	(1,2)
	(MU) TMSCP TK50,TU81 magtape	23-E39A9	0x0705	SRC LST	(1)
	(XE) Ethernet DEUNA/DELUA Net Boot (v1)	23-E22A9	-	-	(4)
	(XE) Ethernet DEUNA/DELUA Net Boot (v2)	23-E32A9	0x05D6	SRC LST	(1)
	(XE) Ethernet DEUNA/DELUA Net Boot (v2)	23-E33A9	0x0755	SRC LST	(1)
	(XM) DECnet DDCMP DMC11/DMR11	23-862A9	0x0625	SRC LST	(1,2)
		23-863A9	0x063F	SRC LST
		23-864A9	0x0551	SRC LST
	(XU) DECnet DDCMP DU11	23-865A9 23-866A9 23-867A9	-	-	(4)
	(XW) DECnet DDCMP DUP11	23-868A9 23-869A9 23-870A9	-	-	(4)
	(XL) DECnet DDCMP DL11-E	23-926A9 23-927A9 23-928A9	-	-	(4)
	(ZZ) Test ROM; runs diagnostics continuously

Creating a boot PROM

Getting the PROMs to burn is a bit challenging, as is getting a device to burn them.. I was very lucky to get an old PROM burner: a Stag Quasar Plus. This comes with Windows XP software that knows a lot of types and which also contains really a lot of older types.

Getting the PROMs themselves was a bit harder.. These devices are old, and not easy to get. The usual route is Ebay, and my first attempt got me 10 MH74S571 proms in two weeks, which according to the number should work. But they did not: this manufacturer Tesla) only made them read compatible, writing them uses a different mechanism than all the others. Sigh.

The next attempt was a set of AM27S13 PROMs from Spain. They arrived by snail three weeks later. That is: the envelope arrived, with a nice thank you note for the order - but without PROMs. They had forgotten to put them in the envelope, so yet another three weeks to wait.

Then I got lucky: I actually found a Dutch shop (I live in the Netherlands part-time) which sold 82S129 PROMs for a sweet price - and these finally arrived… And worked I now have an extra boot PROM for the TU58:

CZM9BE0 M9312/1144 UBI BOOT

DIAG. ROM (E20) (FOR 11-44 UBI: E58)C0

BOOTSTRAP ROM ENTRY POINTS AND DEVICE CODES
LOC.             NO DIAG.       RUN DIAG.       DEVICE CODE

ROM 1(E48)      173004          173006          MS
ROM 2(E49)      173204          173206          DL
ROM 3(E50)      173404          173406          DD

PSEUDO POWER-FAIL VECTOR ADR./NEW PC    173024  173052
ROM SEQUENCE IS INCORRECT AS PER INSTALLATION PROCEDURE.

SEQUENCE SHOULD BE:

ROM 1(E48)      DD
ROM 2(E49)      DL
ROM 3(E50)      MS

Links:

Jorg Hoppe’s site

ELEC

Pdp11 Boot proms

Creating a boot PROM