PDP-8 diagnostic tests

Hi, I have written a PDP-8 VHDL model and I have it running in an FPGA https://github.com/scottlbaker/PDP8-SOC At this time it has passed a basic DEC diagnostic instruction test but I found some interesting things when getting that instruction test to pass. For example: The following segment of

DEC F-11 (Fonz) processor ceramic chip carriers (PDP-11) on eBay

http://www.ebay.com/itm/191974796676?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649

PDP-11/23 system for sale in Portland Oregon

Hi, Pictures can be found here: http://sierracircuitdesign.ddns.net/temp/pdp11/ The system is located in Portland, Oregon. Local pick-up is preferred. Not sure if it still works. I have not tried to turn it on in years. I do not have any software of floppies for it. I'm not sure what it's worth.

Re: cctech Digest, Vol 28, Issue 4

reach the person managing the list at > cctech-ow...@classiccmp.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of cctech digest..." > > > Today's Topics: > >1. PDP-11/23 system for sale in Portl

PDP-11/23 system for sale in Portland Oregon

Update: After removing all the boards, checking jumper settings, etc. and reinstalling everything again. I am please to announce some progress. The PDP-11/23 now boots up to the diagnostic monitor. Thanks very much to people who replied with technical help and particularly to Glen Slick who helped

Bootable 8" floppy needed for PDP-11/23

Hi, I have a PDP-11/23 system with a DSD-440 dual 8" floppy drive. On reset, it prints: 28 START? and waits for the operator to insert a bootable 8" floppy and type DY0. The problem is I do not have a bootable 8" floppy. The DSD-440 should be compatible with either RX01 or RX02. Can anyone on

PDP-11 RL02 disk emulation

Hi, Has anyone built or had any experience with this (or any other) RL02 emulator? http://www.pdp11gy.com/indexE.html#file:///E:/homepage/indexE.html Thanks, Scott

PDP-11 RL02 disk emulation

Hi, The author of this project http://www.pdp11gy.com built a wire-wrapped board to interface an RL02 controller (RL11, RLV21, or RL8A) and an FPGA development board (which does all the heavy lifting for the disk emulation). I decided to build one of these emul

PDP-11 RL02 disk emulation

Hi Noel, >> Any chance it could be put into 'production'? Sure, if there is interest, I could make a run of boards. >> Also, what FPGA board are you using? I assume it's one that has an SD >> card socket or something, for actually storing the bits on? My project is just an interface board for an

PDP-11 RL02 disk emulation

Hi* >> Any chance it could be put into 'production'? *I placed an order today for 3 RL02 emulator interface boards from OshPark. I expect it will take 2 weeks to get the boards back from OshPark. I am leveraging RL02 emulator work from Reinhard Heuberger, but I am using a newer FPGA board than hi

[cctalk] Re: typical IC kits on Amazon and elsewhere

Been lurking for a while, but this topic hits true with some recent experiences. I would not hesitate to buy most common digital ICs on Amazon or ebay, but I usually will not buy analog ICs other than from trusted sources, such as Mouser. I have bought LM2596 voltage regulators that oscillate at th

[cctalk] Re: Intel 8086 - 46 yrs. ago

I think the biggest change is our compute resources stopped going faster in terms of raw cycles per second, and started going wider in terms of parallelism. It's now commonplace for me to run workloads that can actually use many CPU cores, and I'm starting to occasionally run workloads that are so

[cctalk] Re: Value of Intel MDS System

I'm not-so-seriously looking for an Intel MDS system :) I have no idea what one is worth though. Vintage computer prices are all over the place. I had a lot of fun recently restoring an iPDS and building some boards for it (the multimodule adapter and a few multimodules for it). I have thought to

PDP-11/23 for sale in Portland OR

The system consists of: 1) a 19" rack-mountable CPU chassis 2) a 19" rack-mountable floppy-disk drive (and bootable RT-11 floppy-disks) 3) Zenith Z-29-A RS232 terminal The boards included are: M8186 KDF11-A 11/23 CPU ? 256KB parity RAM ? DSD-440 floppy disk interface ? bus g

[cctalk] Re: Open source a panacea?

My own thoughts as a sometimes-opensource developer: 1. Opensource allows you to leverage the community. They will sometimes research problems, fix bugs, or develop features. 2. Opensource allows people to answer their own questions. Documentation always drifts from implementation. If you want to

[cctalk] Re: QIC Archival

Agree with seeking out AJ. Either he or Chuck were the ones who told me how to do it. I was able to successfully read a few tapes by using a SCSI QIC drive and reading a tape under linux. Two things to beware of are that 1) the rubber rollers in old QIC drives will sometimes turn to sticky goo, an

[cctalk] Re: Is there a more modern replacement for paper tape punch/reader

You can also look toward the industrial space. For one of my projects I used a Fanuc PPR, which is generally used in CNC machines and similar. It has both a punch and a reader and uses a serial interface. Easy to work with and very modular in its design. The disadvantage being that it looks more li

[cctalk] Re: Is there a more modern replacement for paper tape punch/reader

For me, back in the day on my Coco, it would have been a CCR like this: https://www.ebay.com/itm/336028139332 There's really no magic, it's an audio cassette recorder with an extra input to start/stop the motor. You may find tapes to be a little unreliable these days -- the cassettes themselves c