test-drb December 2018

test-drb@ccmp.vtda.org

174 participants
203 discussions

by derschjo＠gmail.com

On Fri, Dec 7, 2018 at 11:10 PM Rod G8DGR via cctalk <cctalk at classiccmp.org> wrote: > I?m sure that would work but I only have an 8650 110 baud only card > Rod > The M8650 does a wide variety of baud rates. See here: https://homepage.divms.uiowa.edu/~jones/pdp8/hard8e/kl8e.html - Josh > > > Sent from Mail for Windows 110 baud > > From: Bob Rosenbloom via cctalk > Sent: 08 December 2018 03:41 > To: cctalk at classiccmp.org > Subject: Re: PDP-8/e > > On 12/7/2018 7:01 PM, Pete Turnbull via cctalk wrote: > > On 07/12/2018 17:44, Jon Elson via cctalk wrote: > >> On 12/07/2018 11:22 AM, systems_glitch via cctalk wrote: > >>> Indeed, unless you need character pacing. > >>> > >>> > >> Actually, with the correct settings of the serial port (xon/xoff or > >> CTS pin) the serial port driver should do this, too, so cat would work. > > > > A PDP-8/E doesn't have a CTS pin and the loaders don't support > > XON/XOFF, though. > > > The PDP-8 needs to control the serial CTS function. This was called > reader-run when using a Teletype machine. FOCAL won't load without it. > You can modify the serial card (mine was an M8655) to support the > function. Here's what I did: > > Cleaned up from Aaron Nabil's and Lyle Bickley's write up. > > Hack the M8655 to support reader-run by mapping it to RS-232 hardware > flow control. > > 1. Cut the trace leading from Pin 1 of E54 (a 7400). This is the input > that clears the Reader Run FF when a new character starts to come in. > > 2. Jumper from Pin 1/E54 to Pin 3/E38, a spare gate on a 7400 that we > are going to use an inverter. > > 3. Tie Pin 1 and Pin 2 of E38 together, and run them to Pin 20 of E19, > the UART. > This supplies the signal to the reader-run FF that tells it that > it's got an incoming character and to de-assert the reader-run line. > Normally this is tied to the current loop receiver, we've just > moved it to the UART so any received data will clear the FF. > > 4. Cut a ground traces on 4 of E50, a 1488 RS-232 transmitter. This is > what would normally supply the continuously asserted RTS (and DTR) signal. > > 5. Jumper from pin 7 of E39, a 7474 flip-flop to pins 4 of E50. E39 is > the "reader-run flip-flop". Now RTS follows the reader run signal. > > Bob > > -- > Vintage computers and electronics > www.dvq.com > www.tekmuseum.com > www.decmuseum.org > > >

6 years

PDP-8/e

by elson＠pico-systems.com

On 12/07/2018 11:38 AM, Rod G8DGR via cctalk wrote: > Oh good how do you set them to 110 baud? > Oh, WOW! Good catch, it only goes down to 300 baud! major screwup, ought to be reported to the developers. Jon

6 years

will be having some extra brochures for plated memory from Memory systems in El Suguendo Calif. Available soon

by couryhouse＠aol.com

Will be having some extra brochures for plated memory from Memory systems Inc.? in El Segundo Calif. Available soon.? appears? to? be? from month? 4? of? 1973? and? 3? different? ?sheets? both? sides. ? I? know? about? core memory? but this is? something? I never? used.. ? these may be out there already? somewhere? ? ?? ? Ed# ? ?

6 years

In search of DOMAIN OS for DN10000/Prism

by ian.finder＠gmail.com

Please ping me if you have media or archives of any version of domain for the DN10K... Thanks, - I

6 years

PDP-8/e/f/m Front Panel Knob Wanted (also general information)

by mosst＠SDF.ORG

Hi All, I have a PDP-8/e that's missing the knob on the front panel. Does anyone have a spare for sale, or know of a compatible part? Looking up the DEC parts numbers has turned up nothing but the engineering drawings... I've never seen another one in person so I can't tell if the knob is meant to attach to a shaft on the rotary switch, or if the knob itself is meant to have a shaft. Either way, I'm lacking both, so have been making do with a screw wrapped in tape. Regards, -Tom mosst at sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org

6 years

PDP-8/e

by radioengr＠gmail.com

Teraterm on Windows definitely goes to 110 baud. I use it all the time... Rob. On 12/7/2018 10:38 AM, Rod G8DGR via cctalk wrote: > Oh good how do you set them to 110 baud? > Rod > > > Sent from Mail for Windows 10

6 years

IT books available

by cctalk＠emailtoilet.com

Listed these on eBay a few times. No takers. Being offered here for the price of USPS Media Mail cost. Total of 52 lbs of books in 2 boxes. I estimate shipping at $137. Price will be actual shipping cost payable by PayPal. See books at http://www.myimagecollection.com/ITBooks/ Slides pause for 5 seconds each or you can click the Pause button. No pressure but they hit the trashcan 12/14/2018. J

6 years

Opening RL02 disk pack

by jnc＠mercury.lcs.mit.edu

> From: Paul Birkel >> I thought RL0x drives use an IBM 5440 type pack (as used on the IBM >> System/3 .... DEC may have used their own format (and servo track >> stuff), I don't know much about the 5440. > Sounds to me like it was different, but in a good way? I took a look, and found a manual for a 5440: http://bitsavers.org/pdf/ibm/system3/GA33-3002-0_5444_5440_ComponentsDescr_… and the details (format, etc) are indeed different. The packs are physically compatible, but that's as far as it goes. Noel

6 years

ISO NCD M88K firmware dump

by aek＠bitsavers.org

The MAME folks have the 68K versions of the terminals mostly working in simulation now, and are wondering if anyone could dump the firmware from the 88K model, which has a similar hardware design.

6 years

Tektronix xp217

by carlojpisani＠gmail.com

hi I have for sale a Tektronix xp217 unit, with its PSU and original CD software. let me know if someone is interested.

6 years

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test-drb December 2018