test-drb October 2008

test-drb@ccmp.vtda.org

235 participants
330 discussions

Help with PDP-11 Unibus Map Hardware / Software under RT-11

by jhfinedp3k＠compsys.to

Hopefully, this request is clear enough to be understood. Both the software and the hardware portion of the questions are independently important, so please answer one aspect even if you can't help with the other. Over the past 30 years of using PDP-11 software (RT-11 over 95%) and hardware, I have never had occasion to use a Unibus system with more than 256 KB of memory (such as a PDP-11/34). I would appreciate help in understanding the Unibus Map hardware which (if I understand its purpose correctly) is to convert 18 bit addresses given to a Unibus controller into 22 bit addresses for real physical memory for systems like a PDP-11/84 and perform DMA from / to the hard drive. Also helpful would be an explanation of the related software used under RT-11 along with exactly where the Unibus Map hardware is located on a real DEC system (on the CPU board I presume) since the identical CPU board is used for both the Qbus and the Unibus with both the PDP-11/84 and the PDP-11/94. ------------------------------------------------------------------------- DO NOT READ THE FOLLOWING if you don't use RT-11!!!!!!! By way of context, I have successfully modified the HD0: device driver originally written by John Wilson which obviously executes ONLY under E11. Last week, John mentioned in a private e-mail that it is possible to direct the HD0: "controller" (all references to hardware in quotes refers to E11 software) to ignore the "Unibus Map hardware". Since I execute under E11 using Qbus emulation in order to stay totally compatible with the real DEC PDP-11/23, PDP-11/73 and PDP-11/83 systems (all Qbus and all with 4 MB of physical memory) which I have available for comparison testing, user buffers in physical memory above 256 KB are often a situation which can't be avoided. Consequently, it had always been a high priority to have a 22 bit device driver for HD0: under E11 BECAUSE HD0: is TWICE as fast as MSCP (DUX.SYS device driver). In addition, I have also been able to write code that avoids the overhead of using the HD0: device driver which makes HD0: FOUR times as fast as MSCP and also allows for direct access of 2 TB of disk space via a 32 bit block number. Since I have an immediate application for a data base of 32 GB (I have a disk drive of 160 GB, so 32 GB is only 20% of its capacity - although under RT-11 15 years ago in 1992, 32 GB would have been only a dream), the code which I have written will actually be used quite soon. However, I would very much like the HD0: device driver to be able to execute under both "Qbus" and "Unibus" hardware. And while I can test the code for a "Qbus" and for a "Unibus" without a "Unibus Map", I am not clear about what is required for a "Unibus" with a "Unibus Map" such as a PDP-11/84 running under RT-11. Megan are you still watching the list? Allison, if you can't answer, can anyone but Megan help? Is anyone else familiar enough with the "Unibus Map" that you can suggest what RT-11 actually needs to do with the "Unibus Map"? A solution is to check the "hardware" configuration and refuse to allow the HD0: device driver to LOAD or .Fetch if the modified version is not executing under "Qbus hardware". By the way, if anyone who is thinking of a controller for the Qbus which is able to use SATA drives, I would be happy to modify an RT-11 device driver to an HD0: type device that is able to handle drives up to 2 TB in the same manner that DU(X).SYS can handle drives up to 8 GB. Anyone interested?? Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.

16 years, 2 months

Making an RT-11 boot disk

by dbetz＠xlisper.com

I'm trying to use simh to create an RT-11 bootable RX50 disk and am following some instructions posted by Megan Gentry a while ago. I've created the disk image but am having trouble making it bootable. The copy/boot command claims it can't find the RT-11 image but it is clearly on the floppy (du0). Any idea what's going wrong? .dir du0: 10-Apr-99 RT11XM.SYS 106P 20-Dec-85 DU .SYS 8P 20-Dec-85 TT .SYS 2P 20-Dec-85 PIP .SAV 30P 20-Dec-85 DUP .SAV 47P 20-Dec-85 DIR .SAV 19P 20-Dec-85 RESORC.SAV 25P 20-Dec-85 EDIT .SAV 19P 20-Dec-85 MACRO .SAV 61P 20-Dec-85 CREF .SAV 6P 20-Dec-85 LINK .SAV 49P 20-Dec-85 LIBR .SAV 24P 20-Dec-85 FILEX .SAV 22P 20-Dec-85 HELP .SAV 132P 20-Dec-85 BATCH .SAV 26P 20-Dec-85 FORMAT.SAV 24P 20-Dec-85 SETUP .SAV 41P 20-Dec-85 SPEED .SAV 4P 20-Dec-85 DATIME.SAV 4P 20-Dec-85 LET .SAV 5P 20-Dec-85 SPLIT .SAV 3P 20-Dec-85 CONFIG.SAV 7P 20-Dec-85 SWAP .SYS 27P 20-Dec-85 23 Files, 691 Blocks 95 Free blocks .copy/boot du0:rt11xm.sys du0: ?DUP-F-File not found DU0:RT11XM.SYS

16 years, 2 months

WD1001 (Fortune-32?) Was: boards

by aek＠bitsavers.org

http://mysite.verizon.net/rtellason/pa020085.jpg I haven't seen the inside of one for a while, but this may be for a Fortune-32 JAM or someone with a machine handy (Eric?) could confirm it. There were different 'dash' configurations for the WD1001, according to the WD catalog. The ones listed use ribbon cable connectors.

16 years, 2 months

WD1001 (Fortune-32?) Was: boards

by jam＠magic.com

Roy, Al, > http://mysite.verizon.net/rtellason/pa020085.jpg > > I haven't seen the inside of one for a while, but this may be for a Fortune-32 > JAM or someone with a machine handy (Eric?) could confirm it. Yes, that's a hard disk controller for the Fortune 32:16 computer. I would be happy to save it from going to the scrap heap. James Markevitch

16 years, 2 months

HP 9000/300 computers available

by devilanse＠gmail.com

Hello, The company I work for has approximately 15 HP 9000/300 computers available. These are mainly the 310 models. There are a couple of other models too. Most of them have the SRM boards installed. There is also a HP9826 available. Also are keyboards and monitors. There are NO hard drives or floppy drives. We are going to do an renovation of the area they are stored in. They are free for local pick up in Lexington KY or if you arrange for freight pickup, we will put them on a pallet and wrap them. If there are no takers in 30 days, they will be scrapped. thanks Max

16 years, 2 months

WD1001 (Fortune-32?)

by sbolton＠bfree.on.ca

> http://mysite.verizon.net/rtellason/pa020085.jpg > I haven't seen the inside of one for a while, but this may be for a > Fortune-32 > JAM or someone with a machine handy (Eric?) could confirm it. Al - we have one of those machines here at the Personal Computer Museum (pcmuseum.ca) - if you can give me a couple of days, I can confirm this if nobody else has one handy.

16 years, 2 months

VT220 Keyboard Error 4?

by tiggerlasv＠aim.com

I tend to look for the simpler explanations first. If your keyboard was previously working, the first place I would check is the MMJ on the back of the terminal. I've seen everything from malformed pins, to corrosion, to spider webs, to dead bugs inside RJ12 / RJ45 connectors. Another point of failure is the?MMJ on the keyboard cable; you can try removing that, and re-crimping it. T

16 years, 2 months

Z80 home brew with FDC

by lynchaj＠yahoo.com

________________________________ Yo, Tony here (Sharkonwheels on VC) Got any boards left? CPU board, ECB backplane, and (if ready) FDD/IDE board. Tony [snip] -----REPLY----- Hi Tony! Thanks! Yes, I have several PCBs left. I have N8VEM SBCs, ECB backplanes, and ECB bus monitor PCBs. I just received the ECB bus monitor PCBs and haven't finished building mine yet. Some of the other builders are helping out by taking the lead on the first ECB bus monitor for build and test phase while I continue work on the Disk IO board. The ECB backplanes are going fast which rather surprises me. I have only a few left and am going to have to reorder. The builders who have ECB backplanes seem to like them though. The Disk IO prototype is working fine so I am writing up the schematic and doing the PCB layout right now. I'll be posting the schematic and PCB layout for some much appreciated peer review in the next few days. I am still doing quality checking on them to make sure they are right. The IDE portion looks OK but the FDC portion is complex and has me concerned. The big difference between the prototype and the manufactured PCB will be several option jumpers and a "feature" connector to help builders who want 8" drive support. Thanks and have a nice day! Please contact me offline if you'd like some PCBs. They are still $20 each plus shipping. Andrew Lynch

16 years, 2 months

HP64000 System, Books, Software available

by jimgeneva＠dorisland.net

Steve any chance in gettin email phone number something of the person you gave your HP 64000 to. Jim

16 years, 2 months

Searching for Manual - Hazeltine 1410 Terminal

by ragooman＠comcast.net

Would anyone have a service manual for the Hazeltine 1410 terminal ? I have a peculiar problem where several keys output a different character. I found there's a pattern to this chaos. From looking at the ascii data, bits 5 and 6 become swapped only for characters between 40h and 5Fh. instead of an 'A' it displays a '!" and it continues like this. I'm afraid the i8243 chip might be bad but I'm not completely sure. I found the i8243 datasheet and currently trying to trace the connections. I hear this chip is hard to come by. I only found one supplier so far which I'm waiting to hear back on the rfq. thanks =Dan -- [ Pittsburgh 250th --- http://www2.applegate.org/~ragooman/ ]

16 years, 2 months

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test-drb October 2008