test-drb January 2014

test-drb@ccmp.vtda.org

224 participants
263 discussions

by quapla＠xs4all.nl

After deliberating it for several months, I have decided to let go of most of my PDP-11 stuff. It consists roughly of a 11/70, 2 RK07's, 3 RK05's, 2 RL02's, TU-80 (upright one), RM03 drive and a PC04, + many parts etc. A more complete list can be found at www.groenenberg.net/download/1170 as well as a few pics. Offers are entertained, and questions will be answered. Response to offers will be not immediate, I'll wait at least a week before a decision is made on that. The stuff is located in the Netherlands, about 20 Km west of Arnhem. Ed -- Dit is een HTML vrije email / This is an HTML free email. Zeg NEE tegen de 'slimme' meter.

10 years, 6 months

ISO Hitachi JK-260 paper tape reader schematic

by aek＠bitsavers.org

Not much chance, but I thought I'd ask. It is a capstan driven desktop 8 channel optical paper tape reader, circa 1980. AC motor, built like a tank, and the capstan still feels OK. It shouldn't be too difficult to trace out if not, there are only 11 signals coming out to a 25 pin connector. Obviously parallel given the logic on the circuit board. I'll take some pictures of it and scan the circuit board today.

10 years, 6 months

WTB: Floppy disc test/service disc

by marvin＠west.net

On 1/6/14 6:52 PM, Al Kossow wrote: > That reminds me I need to take some pictures of a Dysan test box that > I picked up at the flea market. It uses a normal drive, so it won't > write off track but it has a lot more circuitry than would be > required for just an ordinary read/write circuit. Al, Bitsavers does not have manuals for either the Dysan Model 450 (5 1/4" drives" or Model 850 (8" drives) online. I do have an original Model 450 manual if you need scans. (I know, I still owe you VG schematic scans.) I did put a Dysan PAT-1 Model 850 (8" drives) up on eBay yesterday in case anyone cares. No manual or accessories :(. FWIW, I have both the Accurite HRD and Dysan DDD 5 1/4" Digital Diagnostic Disks, and they don't seem to be compatible. I use QAFloppy (Diagsoft QAFE/Plus) with the Accurite HRD and it works fine. However the Dysan disk is not recognized by the software. Second, I see the PAT-1 Schematic on Bitsavers is for the PAT-1 Model 850 for 8" disks. Third, the PAT-1 box isn't directly compatible with PC floppies as the interface signals are slightly different. Works fine with the early Shugart/Tandon drives, but won't recongnize PC drives. Finally, I have maybe six or so of the Dysan DDD disks marked bad, bad side 0, or bad side 1. If someone wants to see if they can use them, let me know.

10 years, 6 months

Clear out of various computer detritus (Surrey,UK)

by toby＠pdp11.co.uk

Hi, I've decided to have a clear out to raise some funds for the school club I run teaching 7-11 year olds computer programming, electrics and engineering. So here is what I have looking for a new home: - Lots of micro-vaxes (pizza box style) - Lots of microVax chassis (mostly unpopulated with cards) - Various Apple IIs and Apple II peripherals - Various terminals - SMD drives - BBC micros, Spectrums and ZX81s - Atari 2600's (woodies, darth vaders and jr's) - IBM PC/XTs - Misc PDP-11 parts (a few QBUS chassis, RX50s, TU58s, TK50s, QBUS cards, UNIBUS cards, PDP-11/44, RD,RF,RZ series hard drives) - Lots of other assorted items If anyone is interested in anything or would like to visit and dig through the stash get in contact. All the best, Toby

10 years, 6 months

MFM Control Signals and RD disk size (Robert Jarratt)

by tiggerlasv＠aim.com

On Monday, January 6th, 2014, Jerome Fine wrote: >I assume that drive 0 was DS3 and drive 1 was DS4? Please confirm. >I managed to make up the required circuits and LEDs for a BA23 >box with 2 hard drives and an RX50 (placed outside of the BA23, >but connected with long cables to the normal connectors) connected >to an RQDX2 via the standard distribution board adjacent to the >hard drive bays. I remember that lines 3 and line 4 on the 10 pin >cable supported the second hard drive. My first attempt jumpered >line 1 and line 3 along with line 2 and line 4 to allow the 4 button >panel to support both hard drives as long as they were BOTH in >WRITE PROTECT at the same time. The circuit I developed >much later needed two switches, two resistors and 4 LEDs. >On occasion when I need two hard drives in an BA23, I disconnect >the 10 pin cable to the normal 4 button panel and connect that 10 pin >cable to my contraption. >I am curious, do you have the circuit needed to support the second hard >drive? And did you have to cut any traces on the 4 button panel? >What I don't understand is why DEC did not make the information >easily available if you found it so easy to make supporting a second >hard drive possible. But back then, I guess DEC was DEC. It was >much more profitable selling an expansion BA23 box or better yet >a BA123 box. >Jerome Fine I typically took the easy way out, and soldered two 1/4 watt resistors onto the 4-button circuit board, which ultimately strapped the 2nd hard drive as "Always ready" and "Write Enabled". T

10 years, 6 months

MFM Control Signals and RD disk size (Robert Jarratt)

by michael.99.thompson＠gmail.com

> > From: Glen Slick <glen.slick at gmail.com> > Date: Sat, 4 Jan 2014 12:02:32 -0800 > Subject: Re: MFM Control Signals and RD disk size > On Sat, Jan 4, 2014 at 11:16 AM, emanuel stiebler <emu at e-bbes.com> wrote: > > On 2014-01-04 11:59, Robert Jarratt wrote: > > > >> So how does it do this when the disk is yet to be formatted? In other > >> words, > >> when it formats the disk how does it know what size the disk is? > > > > > > DEC drives have this information in a special area of the drive. > > If for exmaple, the MV2000 finds this blocks, it formats to exactly this > > specs. You see this, if you go into the MV2000 diagnostics. > > > > All other drives, you have to enter the specs manually ... > > > > How does that match with this information, if it is correct, that the > MicroVAX 2000 disk recognizer works for the set of known disk drives > even if the disk came from a different system and has no DEC specific > information or formatting on it currently? > > http://home.iae.nl/users/pb0aia/vax/fmtbob.html > > "The standard DEC drives that are supported in the VS2000 and their > industry equivalents are: > > RD54 - Maxtor XT-2190 > RD53 - Micropolis 1325 or 1335 > RD31 - Seagate ST-225 > RD32 - Seagate ST-251-1 > > If you have any of these standard drives you can simply plug it into > your 2000 and the ROM formatter will automatically recognize the drive > types. I've never seen this fail, even if the drive has never seen a > DEC machine before, or even if the drive was previously formatted in > a PC." > This was posted years ago for the RD53 - Micropolis 1325 or 1335: Unscrew the two screws holding the circuit board to the bottom of the drive and carefully lift it up. Along one edge of the circuit board you will find a place where it would appear that a resistor should be -- this place is marked R7. Solder a jumper into that spot to make this drive into an RD53. Set the drive select jumper to DS2 and you should be in business. -- Michael Thompson

10 years, 6 months

That was quick! S-100 Z80 CPU V2 PCBs ordered

by LYNCHAJ＠YAHOO.COM

Hi! Thanks to the great response on the pre-orders for S-100 Z80 CPU V2 PCBs! I have placed a PCB manufacturing order and they should arrive about the 22 Jan 2014. I will send out the pre-ordered boards first and then offer the remainder to the builders. Thank you very much and have a nice day! Andrew Lynch

10 years, 6 months

Wanting a SWTPC 6800 but need more information

by billdeg＠buzz1.com

>> >> A working, complete, 1975-6 SWTPc with top and bezel, original backplane, >> original CPU and RAM with an MP-S card is worth $1000+. That would be the >> bare minimum system. $700 is too low for a working system. The newer 6809 >> SWTPc's would be worth less, maybe you can get one of these for $700. > >Although note that the earliest SWTPC 6800 used the MP-C card as the >console interface along with Motorola's MIKBUG ROM monitor. This was >all pretty much from the MEK6800-D1 eval kit reference design. > >If you have an MP-S card for the console interface then you will also >have SWTBUG, which SWTPC developed and came later in the evolution of >those systems. Oops. Yes the MP-C, not the MP-S. A working system from the first year or two would be worth a lot more than $700, MP-C / MIKIBUG. Forgot that I upgraded mine. I use the MP-S but I still have the MP-C. Bill

10 years, 6 months

Raritan Dominion PS2 cables available

by sales＠elecplus.com

http://www.cdw.com/shop/products/Raritan-Dominion-KX-PS-2-CIM/597051.aspx?cm _mmc=ShoppingFeeds-_-GoogleBase-_-Servers%20_%20Server%20Management/KVM%20Co nsoles%20_%20Switches-_-597051_Raritan%20Dominion%20KX%20PS_2%20CIM_RAR-DCIM -PS2 <http://www.cdw.com/shop/products/Raritan-Dominion-KX-PS-2-CIM/597051.aspx?c m_mmc=ShoppingFeeds-_-GoogleBase-_-Servers%20_%20Server%20Management/KVM%20C onsoles%20_%20Switches-_-597051_Raritan%20Dominion%20KX%20PS_2%20CIM_RAR-DCI M-PS2&gclid=CLrwnMzA6rsCFa4-Mgoddz0A6A> &gclid=CLrwnMzA6rsCFa4-Mgoddz0A6A A large qty of these are available to me, new. Any takers? Where do you want to be on price? Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 (830)792-3400 phone (830)792-3404 fax AOL IM elcpls _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4259 / Virus Database: 3658/6978 - Release Date: 01/05/14

10 years, 6 months

DEC cables for BlackBox

by sales＠elecplus.com

http://www.ebay.com/itm/BLACKBOX-EHN051-0010-10-FT-VGA-PS2-PS2-M-SERVSWITCH- CABLE-USED-/221148056077 I have 17 pcs of these NEW, available to me. Any takers out there? If so, where do you want to be on price? Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 (830)792-3400 phone (830)792-3404 fax AOL IM elcpls _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4259 / Virus Database: 3658/6978 - Release Date: 01/05/14

10 years, 6 months

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test-drb January 2014