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Does anyone know where I can get a copy of EK-MXV-B2-UG B2 rom set user guide? I have the 2 page installation guide. and the MXV11-B user guide for the card. Thanks Peter

My KDF11 11/23 CPU M8186 has a broken 13.824 Mhz xtal oscillator (metal cased - fits DIL14) 4 pins used is faulty. I am having difficulty in locating a suitable replacement. I have found a 12 MHz and a 13 MHz part but not a 13.824 Mhz part. a) will it run ok, though slightly slower with either...

I have an RXV21 M8029 PCB: 5013080 C Sticky label: AB94473558 Plastic handle: 950 E There are no mod records marked so presume that this is REV E. What are the later changes needed to make the RXV21 work on Q22 micro pdp 11/73? I have read rev H supports Q22, What are the mods / changes to...

I have a Plessey 256KB QBUS memory card 705035 but am lacking any technical information on it. It is a dual card with 36 x 4864 DRAMs (64 K x 1) so 256 KB plus parity. There are 2 switches: S1 4pole all on S2 10 pole 1,6,7,8 off, 2-5 & 9-10 on Is this...

What is a PC Telnet program with good VT100 emulation? I would like to run Teco as a screen editor installed for either a VT52 or VT100 over a telnet session. What is a good Telnet program for the PC with a useable emulation of either a VT52 or a VT100 that is good enough to run Teco as an on...

Hi, Is there a standard version of simh (pdp11) that will run on the raspberry pi? I am aware of PiDP11 variant but that seems to be tightly tied into the PiDP 11/70 front panel emulation hardware. However, without the hardware it does not appear to be straight forwards to run emulations on...

I have a 3rd party SCSI controller, which seems to work fine in my 11/73 controlling a SCSI2SD and a Pioneer DR U124 CDROM. I have an HP DDS3 DAT SCSI drive (C1537) that I would also like to get going. Any suggestions? Thanks Peter

Has anybody succeeded in interfacing the CH375 / 376 chip to a CP/M system? The CH376 has 3 modes of interfacing between a host and USB: 8 bit parallel, 4 bit SPI, 2 wire async. I am trying to run the chip in 8 bit parallel mode. I am trying to talk to a CH376 at port 0x28 & 0x29 on a Z80...

I recently came across the Terak 8510 which seems to be a sort of PDP11 clone. What is the difference? As far as I can ascertain it is a QBUS computer with a KDF11 cpu but then has a bunch of OEM non-standard cards for floppy (NEC765), serial, memory. Although it will run RT11 as far as I can...

I am trying to get some information off a Zilog ZDS125 8" RIOS disks. They are standard 8" Single Density FM 128 or 132 bytes / sector, 32 sector, hard sectored disks. Does anyone know what the track format is for hard sectored disks and if any of the standard WD17xx chip sets can be...

Does anybody know where I can get a replacement LCD screen for an old Sharp PC3000/3100? Or an alternative LCD. I believe that these were designed by Sharp for Atari as Porfolio 2 but were never sold via Atari. Mine has a cracked LCD. https://en.wikipedia.org/wiki/Sharp_PC-3000 Thanks Peter

I believe that Sigma use to produce PDP11 compatible QBUS floppy disk interface cards, which unlike the DEC M8029 RXV21 also included the control and formatting controller which in the DEC product lived in the RX02 drive unit. That the SDC-RXV21 would directly drive a Shugart 800/850 series 8"...

My 11/73B seems to have 2 different versions of ODT built in! The J11 built in microcode odt entered when the J11 is halted and the ROM ODT entered from the 23-168E5/169 ROMs from SETUP option 15? Can anyone point me to a couple of documents one for each and perhaps a differences document...

I have a faulty M8067-LB MSV11-PL quad 512 Kbyte memory board. It came with some other parts. However, it looks as though it has been 'repaired' in the past in that 2 of the MK4564N-15 DRAMS have been replaced with HM4864AP-2 DRAMS. The board originals are 150 nS, but the replacements are 200...

Is the Micro-Power Pascal for RT11 available anywhere? I have tried a few searches and all I can find is the Introduction documentation. Are image copies of the disks available? Thanks Peter

I seem to recollect from the past that an RSX11M v3.2 sysgen use to take a couple of hours on an 11/34 with dual RL01s. I am trying to generate RT1156b on an 11/53 with RQDX3 and RD31 under RT11SB. It has been going for the last 4 hours and doesn't show signs of completing! How long should it...

Is there a version of XXDP ZRQAH0 -RQDX3 exerciser that supports RD3x drives? Where do I get it? As far as I can tell ZRQAH0, although is the exerciser for RXDX3 it only supports RD5x drive types. Thanks Peter

I am trying to get an 11/73B running with dual MSCP controllers. I have an RQDX3 already and am trying to add an Emulex UC07 as a secondary controller. However, I am getting conflicting information for the correct secondary MSCP CSR. In the Emulex Uc07/08 technical manual (UC0751001-00 Rev F...

I recollect reading a short note somewhere that the Emulex UC07 dual width Qbus SCSI card is not compatible with the KDJ11-BB 11/73B Quad width CPU card (M8190-AB) but is ok with the older KDJ11-AA dual width 11/73 cpu (M8192). Does anybody have any further information on this? Are there any...

I am trying to get an old GNT model 34 high speed PTP to work on my 11/73 via a DRV11 parallel i/f and some thoughts came to mind. How do high speed paper tape punch heads work? EIA RS227 defines: sprocket hole as .042" diameter bit...