Image Map Image Map
Page 2 of 5 FirstFirst 12345 LastLast
Results 11 to 20 of 49

Thread: HP 1000/A900, with 7937 HDD

  1. #11
    Join Date
    Dec 2010
    Location
    Seattle, WA
    Posts
    1,758

    Default

    Quote Originally Posted by Chuckster_in_Jax View Post
    I used to use Reflection by Walker,Richer & Quinn for terminal emulation. It's on the HPMuseum website.
    Thanks. I never noticed that was there. I'll grab a copy now.

    I already have Reflection 4+ for DEC terminals.

  2. #12
    Join Date
    Aug 2015
    Location
    Inside an MRI
    Posts
    1,102

    Default

    Thanks, gslick. I had some of those pdfs, but the hp museum isn't as comprehensive as I'd thought, it seems. I don't know why I didn't go to Bitsavers fist. I can only guess that it was because I was on site, under time pressure and the HP museum came up first in search.

    Quote Originally Posted by gslick View Post
    The first I/O card needs to go in the rightmost slot next to the 12201 Sequencer Card.
    Does that have to be an HP IB card, as at present or could it (temporarily) be a 12040 async mux board

    Quote Originally Posted by gslick View Post
    Good thing you have the 28658-63005 RS-232C MUX Panel Cable and the 28658-60005 RS-232C Panel for the 12040 async mux board, and also a 12076-63002 Ethernet Stub cable for the 12076 Ethernet board. The cables are usually more difficult to find and can be more expensive than the boards.

    Do you have two 12040 async mux board, cable, and panel sets? If you only have one then you either need another one of those for the console for the second system, or a 12005 async board.
    I have two 12040 async mux boards, but only one each of the the 28658-63005 RS-232C MUX Panel Cable, the 28658-60005 RS-232C Panel and the 12076-63002 Ethernet Stub cable. But that's OK because, while I'll test both machines, I only plan on keeping one. Probably the one with the 12076 Ethernet board - perhaps I can get it to talk to my pdp11/34? It also came with Ethernet kit.

    Quote Originally Posted by gslick View Post
    I don't know if anyone has bothered to archive images of the different versions of the firmware EPROMs. If no one has already done that it would be nice to do so. What firmware versions do you have on you 12040 and 12203 boards?
    I'll report back on that when I have a chance to pull the boards and look. Not sure what I have in the way of EPROM kit, right now but if all else fails I recently scored a Commodore Colt that might support the ISA card/ programmer combo that I got from another member last year. Worst case, I've been meaning to drag one of the 5150s out of the (dry, don't worry) basement and fire it up. They've been on the back burner for far too long - I may start another thread about the reasons why.

    It will be some time before I can start any testing - as mentioned, I need to make space and that means completing at least two of three projects - a pdp11/34, a PET 4032 with 8050 FDD and an IBM 5110 with 5114 FDD and 5103 Printer. I've been acquiring stuff faster than I can play with it, this past year or so.

    Speaking of which, does anybody know whether an HP 86B can access an HP 7945 HDD? I recently scored an 86B, already had two 9130 FDDs and while in my storage I noticed a previously forgotten 7945 HDD in a 19" rack adapter. It seems to me that that lot, along with a suitable monitor, would fit nicely in the upper part of the HP rack, if I keep it (which I think I'm talking myself into as I type this). The 1000 A900 and 7937 HDD will definitely fit in the bottom part. Who knows, perhaps I could use the 86B as the terminal for the 1000 A900? They made an 82939A Serial Interface and there's at least one terminal emulator for it - TERM/80.

    When I stripped my pdp11/34 out of the double wide rack that I definitely didn't have room for, there were a couple of little 1U pull out shelves, presumably for placing manuals and the like on. I took them, because why not and if I cut a couple of slots in one for a strap, it would be perfect for the 86B.

    Seems to me that that would be an excellent way to use all of the space in the rack. Two systems for the footprint of one, as I'd still be able to use the 86B as a standalone machine as well as a terminal for the 1000 A900. Damn, but that has me enthused! Time to pull my thumb out and make some progress!

  3. #13
    Join Date
    Dec 2010
    Location
    Seattle, WA
    Posts
    1,758

    Default

    Quote Originally Posted by roberttx View Post
    Does that have to be an HP IB card, as at present or could it (temporarily) be a 12040 async mux board
    On the earlier HP 1000 series the slot placement of I/O cards in the I/O backplane determined the I/O card select code, in addition to the card priority. On the A-series the I/O card select code is determined by switches on the card so the card priority is the only real consideration.

    One of the manual says: "Interrupts from a higher priority device inhibit lower prority interrupts by breaking the priority chain. From the standpoint of system response time, it is more efficient to assign the higher priorities to high-speed peripheral devices."

    For initial testing with just a VCP console connection it would be fine to install the 12040 async mux in the first I/O card slot next to the 12201 Sequencer Card. The important thing is to not have any empty I/O slots between the first I/O card in use and the last I/O card in use.

    Quote Originally Posted by roberttx View Post
    Speaking of which, does anybody know whether an HP 86B can access an HP 7945 HDD? I recently scored an 86B, already had two 9130 FDDs and while in my storage I noticed a previously forgotten 7945 HDD in a 19" rack adapter.
    Do you actually have an 86A, not an 86B? The 9130A floppies attached to an 86A through an interface built into the 86A, which was not HPIB. The 86B had a built in HPIB interface instead of the 9130A floppy interface.

    The 80-series Mass Storage ROM supports Amigo protocol storage devices. The Extended Mass Storage ROM is needed to support SS/80 protocol storage devices. CS/80 protocol storage devices are not supported. The 7945 is a CS/80 drive so it wouldn't be supported.

    More info here:
    vintagecomputers.site90.net/hp85/parts.htm#drives

  4. #14
    Join Date
    Aug 2015
    Location
    Inside an MRI
    Posts
    1,102

    Default

    Quote Originally Posted by gslick View Post
    On the earlier HP 1000 series the slot placement of I/O cards in the I/O backplane determined the I/O card select code, in addition to the card priority. On the A-series the I/O card select code is determined by switches on the card so the card priority is the only real consideration.

    One of the manual says: "Interrupts from a higher priority device inhibit lower prority interrupts by breaking the priority chain. From the standpoint of system response time, it is more efficient to assign the higher priorities to high-speed peripheral devices."

    For initial testing with just a VCP console connection it would be fine to install the 12040 async mux in the first I/O card slot next to the 12201 Sequencer Card. The important thing is to not have any empty I/O slots between the first I/O card in use and the last I/O card in use.
    Thanks, that's helpful.

    Quote Originally Posted by gslick View Post
    Do you actually have an 86A, not an 86B? The 9130A floppies attached to an 86A through an interface built into the 86A, which was not HPIB. The 86B had a built in HPIB interface instead of the 9130A floppy interface.

    The 80-series Mass Storage ROM supports Amigo protocol storage devices. The Extended Mass Storage ROM is needed to support SS/80 protocol storage devices. CS/80 protocol storage devices are not supported. The 7945 is a CS/80 drive so it wouldn't be supported.

    More info here:
    vintagecomputers.site90.net/hp85/parts.htm#drives
    This is why I shouldn't post late at night when the kit isn't in front of me. I have an 86B, with HPIB, two 9130As, with proprietary interface for an 86A and a 7945 which is, as you have kindly explained CS/80. None of these things are compatible with each other. So much for that idea.

  5. #15
    Join Date
    May 2011
    Location
    Liverpool, England
    Posts
    346

    Default

    I have the opportunity to obtain an A900, it has no peripherals (disk, tape) or any cables but has many cards installed, not sure what yet.. Has any work been done to use standard non HP 1000 hard disk drives with these?
    It is a 115V version, is it possible by changing jumpers/wiring etc for it to work on 240V or will I need a step down transformer?
    Thanks.
    Last edited by PG31; March 31st, 2018 at 04:08 AM.

  6. #16
    Join Date
    Dec 2010
    Location
    Seattle, WA
    Posts
    1,758

    Default

    Quote Originally Posted by PG31 View Post
    I have the opportunity to obtain an A900, it has no peripherals (disk, tape) or any cables but has many cards installed, not sure what yet.. Has any work been done to use standard non HP 1000 hard disk drives with these?
    It is a 115V version, is it possible by changing jumpers/wiring etc for it to work on 240V or will I need a step down transformer?
    Thanks.
    Take a look at the Chapter 11, Power Supply section of this manual:
    www.bitsavers.org/pdf/hp/1000/A-series/02139-90003_A900_ERD_Apr86.pdf

    It appears that both the 440-watt supply for the 20-slot backplane and the 300-watt supply for the 16-slot backplane can operate from either 115 VAC or 230 VAC.

    However, the fans run on a fixed AC voltage and the power cable to the fans needs to be connected to either the 115V or the 230V connector on the supply which corresponds to the line supply voltage.

    If the A900 system you might acquire has any I/O cards installed I would be surprised if it doesn't have a least one 12009A HPIB I/O card installed. That is the standard I/O card for HPIB hard drives and tape drives. If you don't have any HPIB hard drives you can use a PC to emulate them. See the HPDrive Project: www.hp9845.net/9845/projects/hpdrive/

    There is also the 12016A SCSI interface. Those are rare and $$$. I have two of those, but only one cable. Even the cable is hard to find and expensive. I have never gotten around to trying out the 12016A SCSI interface yet.

  7. #17
    Join Date
    Aug 2015
    Location
    Inside an MRI
    Posts
    1,102

    Default

    Or, if you have your heart set on a period correct HDD, the 7945s come up from time to time and are a lot smaller (both in capacity and physically) than the 7937s.

    I would encourage you to buy the machine, then see what boards are in it.

  8. #18
    Join Date
    May 2011
    Location
    Liverpool, England
    Posts
    346

    Default

    s-l1600.jpgs-l1600a.jpgs-l1600b.jpgThanks, both you posts are encouraging and informative. I'll update the post if I acquire it.. I've attached some jpg's of spare cards that are with the system. There are 7 cards installed in the A900 from right to left. I haven't physically seen the machine to get part numbers.
    Last edited by PG31; March 31st, 2018 at 11:36 AM.

  9. #19
    Join Date
    Dec 2010
    Location
    Seattle, WA
    Posts
    1,758

    Default

    In those photos the cards with four 40-pin DIP chips look like 12007B HDLC Modem Interface cards. Not really useful unless you connect multiple HP-1000 systems together in DS/1000-IV networks.

    12044A HDLC Interface / 12007B Modem Interface (two similar but different cards)
    www.hpmuseum.net/display_item.php?hw=1006
    www.hpmuseum.net/exhibit.php?hwimg=1006

    The card with a single 48-pin DIP chip is a 12009A HPIB Interface.
    www.hpmuseum.net/display_item.php?hw=662

    The memory card might be either a 12220A 768KB or a 12221A 3MB Memory Array card. Same cards with either 64K x 1 or 256K x 1 DRAM chips. The memory cards need to be installed next to the 12204A Memory Controller card and all connected to it via a 12222 frontplane board. The frontplane attaches to the black connector running between the two card eject handles. The frontplane boards can be more difficult to find than the 12204A Memory Controller card or the Memory Array cards. If you pick up the system make sure you get the memory array frontplane. There are various sizes of frontplanes depending on how many memory array cards are installed.

    In addition to a 12204A Memory Controller card and at least one Memory Array card and frontplane, an A900 also needs a 12201A Sequencer card, a 12202A Data Path card, and a 12203A Cache Control card. A 12205A Control Store card is optional. Any additional cards would be various I/O cards.
    Last edited by gslick; March 31st, 2018 at 06:46 PM.

  10. #20
    Join Date
    Dec 2010
    Location
    Seattle, WA
    Posts
    1,758

    Default

    Beyond the core A900 CPU and memory cards, you also need either a 12005A serial interface card and cable, or a 12040 8-channel async mux card and breakout box to use as the system console.

    12005 Serial Interface
    www.hpmuseum.net/display_item.php?hw=705

    12040D MUX Interface
    www.hpmuseum.net/display_item.php?hw=664

    Along with the 12009A HPIB interface card, the 12005A and 12040D (or earlier revisions) cards seem to be the most common I/O cards.

    A900 core CPU cards 12201, 12202, 12203, 12204
    www.hpmuseum.net/exhibit.php?hwimg=594

    A900 768KB card 12220A
    www.hpmuseum.net/display_item.php?hw=706

    A900 3MB card 12221A
    www.hpmuseum.net/display_item.php?hw=729

    A900 8MB card 12221B
    www.hpmuseum.net/display_item.php?hw=1159

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •