HECnet February 2013

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39 participants
846 discussions

Re: [HECnet] Re: [HECnet] [HECnet] Re: [HECnet] Issues bringing TOPS-20 UP (again )

by b4＠gewt.net

On 4 Feb 2013, at 18:02, Jordi Guillaumes i Pons <jg at jordi.guillaumes.name> wrote: El 04/02/2013, a les 22:56, Cory Smelosky <b4 at gewt.net> va escriure: Nevermind, Everything's fine after a rebuild of klh10 Or not still lossy This is bizarre. It was fine until the VM host moved to vmware... I have three news for you: 1: It's a known bug (good) 2: It has a workaround (good) 3: You won't like it (baad!) The bug is related with the async timer implementation in KLH10. It has been discussed in the TOPS-20 mailing list and someone (IIRC was the late Mark Crispin himself) said it was not fixable. The relevant details (and the workaround) are here: Ahh. I wonder why the bug just suddenly appeared for me... https://groups.google.com/forum/?hl=en&fromgroups=#!msg/alt.sys.pdp10/xndbq… Now the bad news. The KLH10 idling "device" is based on the asynch timer implementation, and DOES NOT WORK with synch timers. That means KLH10 will use all your available CPU, all the time. There is ANOTHER workaroud for that (I'm using it with my KHL10 simulator running in a rasp-pi). If you are going to use Linux search for a nifty utility called cpulimit. It does just what you think it does :). In a crude way, but it works. Hmm. I think I might look in to that, thanks! Jordi Guillaumes i Pons jg at jordi.guillaumes.name HECnet: BITXOV::JGUILLAUMES -- Cory Smelosky http://gewt.net/ Personal stuff! http://gimme-sympathy.org/ My permanently-a-work-in-progress pet project.

11 years, 9 months

Download a PDP-11 w/o Ethernet?

by drb＠msu.edu

Are these ROMs for an M9312 boot/terminator? They weren't on the DMC/DUP card? Correct, they appear to be M9312 ROMs. De

11 years, 9 months

Download a PDP-11 w/o Ethernet?

by bob＠jfcl.com

Theoretically, three-chip boot ROM sets exist for: Are these ROMs for an M9312 boot/terminator? They weren't on the DMC/DUP card? Thanks, Dennis. Bob

11 years, 9 months

Download a PDP-11 w/o Ethernet?

by drb＠msu.edu

but I think they're on the list of "not known in captivity". Actually, maybe I spoke too soon. I see bitsavers has the XM ones. http://bitsavers.trailing-edge.com/bits/DEC/pdp11/M9312/ De

11 years, 9 months

Download a PDP-11 w/o Ethernet?

by drb＠msu.edu

An off the wall question that I'm sure somebody on HECnet will know - was it ever possible to download a boot image (e.g. RSX-11S) to a PDP11 over a DDCMP serial interface (e.g. a DUP/DMR/DMC or whatever)? Kind of like doing MOP over Ethernet, but without the Ethernet. Theoretically, three-chip boot ROM sets exist for: (XL) DECnet DDCMP DL11-E - 23-926A9, 23-927A9, 23-928A9 (XM) DECnet DDCMP DMC11/DMR11 - 23-862A9, 23-863A9, 23-864A9 (XU) DECnet DDCMP DU11 - 23-865A9, 23-866A9, 23-867A9 (XW) DECnet DDCMP DUP11 - 23-868A9, 23-869A9, 23-870A9 but I think they're on the list of "not known in captivity". De

11 years, 9 months

Re: [HECnet] [HECnet] Re: [HECnet] Issues bringing TOPS-20 UP (again )

by jg＠jordi.guillaumes.name

El 04/02/2013, a les 22:56, Cory Smelosky <b4 at gewt.net> va escriure: Nevermind, Everything's fine after a rebuild of klh10 Or not still lossy This is bizarre. It was fine until the VM host moved to vmware... I have three news for you: 1: It's a known bug (good) 2: It has a workaround (good) 3: You won't like it (baad!) The bug is related with the async timer implementation in KLH10. It has been discussed in the TOPS-20 mailing list and someone (IIRC was the late Mark Crispin himself) said it was not fixable. The relevant details (and the workaround) are here: https://groups.google.com/forum/?hl=en&fromgroups=#!msg/alt.sys.pdp10/xndbq… Now the bad news. The KLH10 idling "device" is based on the asynch timer implementation, and DOES NOT WORK with synch timers. That means KLH10 will use all your available CPU, all the time. There is ANOTHER workaroud for that (I'm using it with my KHL10 simulator running in a rasp-pi). If you are going to use Linux search for a nifty utility called cpulimit. It does just what you think it does :). In a crude way, but it works. Jordi Guillaumes i Pons jg at jordi.guillaumes.name HECnet: BITXOV::JGUILLAUMES

11 years, 9 months

Download a PDP-11 w/o Ethernet?

by bob＠jfcl.com

An off the wall question that I m sure somebody on HECnet will know was it ever possible to download a boot image (e.g. RSX-11S) to a PDP11 over a DDCMP serial interface (e.g. a DUP/DMR/DMC or whatever)? Kind of like doing MOP over Ethernet, but without the Ethernet. Thanks, Bob

11 years, 9 months

Re: [HECnet] Re: [HECnet] Issues bringing TOPS-20 UP (again )

by b4＠gewt.net

On 4 Feb 2013, at 16:45, Cory Smelosky <b4 at gewt.net> wrote: On 4 Feb 2013, at 16:38, Cory Smelosky <b4 at gewt.net> wrote: I'm having issues bringing TOPS-20 up tly SJ 0: Status of structure TOPS20: is set: SJ 0: Domestic, Unregulated, Shared, Available, Dumpable SJ 0: [DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 4086][dte_10xfrbeg: out of data, no I bit][DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 3329][dte_10xfrbeg: out of data, no I bit][DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 4086][dte_10xfrbeg: out of data, no I bit][DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 332 Is all that gets printed to the console, is that a bad CPU instruction, have I corrupted a binary, or is that a bug in how it handles networking? -- Cory Smelosky http://gewt.net/ Personal stuff! http://gimme-sympathy.org/ My permanently-a-work-in-progress pet project. Nevermind, Everything's fine after a rebuild of klh10 Or not still lossy This is bizarre. It was fine until the VM host moved to vmware... -- Cory Smelosky http://gewt.net/ Personal stuff! http://gimme-sympathy.org/ My permanently-a-work-in-progress pet project. -- Cory Smelosky http://gewt.net/ Personal stuff! http://gimme-sympathy.org/ My permanently-a-work-in-progress pet project.

11 years, 9 months

Re: [HECnet] Issues bringing TOPS-20 UP (again )

by b4＠gewt.net

On 4 Feb 2013, at 16:38, Cory Smelosky <b4 at gewt.net> wrote: I'm having issues bringing TOPS-20 up tly SJ 0: Status of structure TOPS20: is set: SJ 0: Domestic, Unregulated, Shared, Available, Dumpable SJ 0: [DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 4086][dte_10xfrbeg: out of data, no I bit][DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 3329][dte_10xfrbeg: out of data, no I bit][DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 4086][dte_10xfrbeg: out of data, no I bit][DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 332 Is all that gets printed to the console, is that a bad CPU instruction, have I corrupted a binary, or is that a bug in how it handles networking? -- Cory Smelosky http://gewt.net/ Personal stuff! http://gimme-sympathy.org/ My permanently-a-work-in-progress pet project. Nevermind, Everything's fine after a rebuild of klh10... -- Cory Smelosky http://gewt.net/ Personal stuff! http://gimme-sympathy.org/ My permanently-a-work-in-progress pet project.

11 years, 9 months

Issues bringing TOPS-20 UP (again )

by b4＠gewt.net

I'm having issues bringing TOPS-20 up tly SJ 0: Status of structure TOPS20: is set: SJ 0: Domestic, Unregulated, Shared, Available, Dumpable SJ 0: [DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 4086][dte_10xfrbeg: out of data, no I bit][DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 3329][dte_10xfrbeg: out of data, no I bit][DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 4086][dte_10xfrbeg: out of data, no I bit][DTE: Bad to-10 BP 0,,0][dte_10xfrbeg: 10cnt left: 332 Is all that gets printed to the console, is that a bad CPU instruction, have I corrupted a binary, or is that a bug in how it handles networking? -- Cory Smelosky http://gewt.net/ Personal stuff! http://gimme-sympathy.org/ My permanently-a-work-in-progress pet project.

11 years, 9 months

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HECnet February 2013