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15586 discussions

by wilson＠dbit.com

From: Dave McGuire <mcguire at neurotica.com> >I myself have multiple KS10 systems here, and would love to be able to >plug DEUNAs into their Unibus chassis at some point and have it actually >work. I probably say this every time this comes up: I've heard the point made that the DEUNA draws too much power to live in a KS10's BA11K along with the usual mess of stuff. I haven't checked the math but it certainly wouldn't hurt to make it a DELUA instead, for that reason alone. At one point I got a minimal start on writing a DELUA driver for ITS, but it's on my ITS RM80 that may or may not still work. John Wilson D Bit

10 years, 7 months

corrupted tape images

by mcguire＠neurotica.com

See http://mailman.trailing-edge.com/pipermail/simh/2015-March/013184.html I've independently verified this myself. Most of the RSTS/E stuff is ok, but a lot of the RSX stuff is corrupt. Man that really sucks. :-( -Dave -- Dave McGuire, AK4HZ New Kensington, PA

10 years, 7 months

TOPS-10 KS10 Ethernet Monitor

by wilson＠dbit.com

From: Johnny Billquist <bqt at softjar.se> >I seem to remember having read that they were parity for each byte, but >looking at a Unibus spec now (from 1979), it seems PB is actually >indicating a parity error, while PA is reserved for future use. OK I had PA and PB reversed, but, exactly. I don't know if that means PA/PB had a slightly different meaning in the early days when the parity controller was outboard of the core stacks (in that case I'd think you couldn't mix old and new hardware, which doesn't seem to be a problem), or else they changed the spec before the hardware hit the streets and everything is fine (which sounds more like it). >And the >slave are expected to generate these signals, and the master is expected >to check them, so I guess the DEUNA/DELUA should generate/check them, if >it is a proper Unibus citizen. Which could make life in a KS interesting... Well, my point is that if it's true that PB is now asserted only on an error (vs. both being asserted or not depending on the parity of that byte), then if it *never* gets asserted, everything's fine. Accesses to CSR space certainly don't check parity so it seems that nothing bad happens if you don't assert these pins. And I'm thinking the DEUNA/DELUA would stop with a parity error if it found PB asserted when reading memory with DMA, which is a good reason to make sure the data structures and buffers you give it never have the 17th/18th bits set, but otherwise, no sweat. You're giving up parity checking but the KS10 MMC/MMAs already do ECC and I don't think they need Unibus masters to be in charge of noticing flaky RAM. John Wilson D Bit

10 years, 7 months

VCF East

by steve＠davidson.net

All, For those who did not attend VCF East you missed a great time! On Saturday, the keynote speaker was none other than Brian Kernighan. You really missed a treat - right Dave! Next year, I plan to bring even more stuff (not nearly as much as Dave did) but more than this year. Dave's island of equipment included the following: PDP-8 PDP-11/34 PDP-11/44 DECserver-200 multiple terminals I'm sure I have forgotten something... I added: VAXstation 4000/60 DEChub-90 backplane with a DECserver-90TL and a 16-port DEChub VT320 a gateway (actually bridge) machine to connect to HECnet only the link was pathetic Brian (aka VAXman) added: VAXstation 4000/30 (aka VLC) In addition to the "island" Dave had other "exhibits" that I will defer to Dave for discussion. Next year we NEED more stuff! This is the official challenge to anyone on the East coast. We want to see many more of you. If is is DEC it is needed. I would also like to personally add my thanks to Dave and Brian for making this such a treat. Dave is nuts (in a good way) and very generous. Brian was there for me when my brain could not content with the sheer volume of noise - helping me to configure the DECservers and dealing with my fat fingering the keyboard and the license management facility (LMF). For a while we were Frick and Frack but we managed to get it together. Thanks guys! -Steve

10 years, 7 months

Paging Peter Lthberg

by b4＠gewt.net

Peter, How exactly do I BOOT the SC-40 from tape? You're the only onw who knows. ;) I have a compatible HVD tape drive and a properly-written tape...now I just need to know how to boot it. -- Cory Smelosky http://gewt.net Personal stuff http://gimme-sympathy.org Projects

10 years, 7 months

TOPS-10 KS10 Ethernet Monitor

by b4＠gewt.net

Hello, I've been attempting to (likely incorrectly) get the DEUNA emulation working in SIMH's KS10 simulator. Current status: * Exists * Has an address * Has a vector * Can be enabled * Can attach to host interface ...and that's as far as I've gotten. Currently having issues getting TOPS-10 to successfully link for KS10 with ethernet support. Anyone have a pre-genned MONITOR executable? -- Cory Smelosky http://gewt.net Personal stuff http://gimme-sympathy.org Projects

10 years, 7 months

TOPS-10 KS10 Ethernet Monitor

by wilson＠dbit.com

From: Johnny Billquist <bqt at softjar.se> >I'm curious on exactly how a DEUNA/DELUA works in a KS-10. Does anyone >know? Does it do 8-bit-byte DMA to the 18-bit memory, leaving the top >two bits alone. Or does it only work if it do word DMA (would be >strange, as the controller itself can send and receive odd byte length >ethernet packets). This is what the BLTBU and BLTUB instructions are for in the later microcode (converting between sensible PDP-10 memory and the mishmash you get as a result of DMA through the UBA to a 16-bit peripheral). Since a DELUA is not 18-bit-data-aware, it ignores the high two bits of each 18-bit halfword when doing DMA. >Is there some potential problem with regards to a PDP-11, which have two >parity bits for data, which are used for actual data on a KS? (If I >remember right.) IIRC you're OK as long as you don't set those bits in memory that the DELUA will read. I feel like the Unibus documentation changed at some point, between whether PA/PB are actual parity bits (I think that's what the very early doc said), vs. being parity *error* bits (and I think PB isn't even really used -- PA asserted means there's been a parity error detected in the current DATI/DATIP). I could be wrong about all of this. John Wilson D Bit

10 years, 7 months

Last month's Ebay auction for DEC VAX Ultrix, NETBSD software, TK50 cassettes, DECDirect Disks

by jim＠deitygraveyard.com

With all the recent Ultrix talk I guess it's safe to assume nobody here won this auction last month: http://www.ebay.com/itm/321694487216 . Right? (I think) I downloaded an Ultrix 4.5 CD a while back so I'm really hoping to get the Software Products Library CD. Among other things I want DECNET-Plus. And I want the Documentation CDs. And... I really wish I had gotten in on that auction. :( Jim

10 years, 7 months

ULTRIX DECNET LMF?

by sampsa＠mac.com

Any of you happen to know what the correct LMF code for ULTRIX-32 4.0 DECNET happens to be? I know a guy who knows a guy with pakgen *cough* so I could get the necessary licenses but we don't know what the product codes are.... Sampsa

10 years, 7 months

Ultrix

by mcguire＠neurotica.com

By the way, since we're discussing Ultrix...I just remembered that I have 4.3 and 4.4 CDROMs for VAX. I just made images of them. Let me know if you want 'em.. -Dave -- Dave McGuire, AK4HZ/3 New Kensington, PA

10 years, 7 months

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