Pdp11 Boot proms
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) | |
| 23-E33A9 | 0x0755 | SRC LST | |||
| (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
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