test-drb

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101090 discussions

by jnc＠mercury.lcs.mit.edu

> From: William Degnan > Does anyone have a M7800 (DL11) set for 9600 b N71 or N81 jumper'd with > the default address for use as a serial terminal interface? Yup. (And BTW the baud's not jumpers, it's the dials.) > I understand the other jumpers on the card, but the address and vector > jumpers confuse me. Join the crew... :-) The simple rule on the DL11 is that vector jumpers are the inverse of address jumpers: for the vector, jumpers are 'in' for '1', and for the address, they are 'in' for '0'. > I think for use as a simple serial terminal interface I need to jumper > "in" *A9, A7, A5, A4, A3* ... correct? Vector jumpers *V6, V7 "*in" . You mean for the console, right? (All DL11's are 'simple serial terminal interfaces' ;-). The jumpers you give are for DL11 #1, address 776500, vector 300. For 777560/60 (standard for the console), you want A7/A3 and V4/V5 'in'. Noel

10 years, 1 month

Adapting digital RGBI monitor to accept analog RGB

by echristopherson＠gmail.com

I am in possession of two Magnavox (North American Philips) CM8562 monitors. Out of the box they handle composite and digital RGBI (CGA) input. What I'd like to do is get one to handle analog RGB (like arcade boards, Amiga, Atari ST, and Apple IIGS put out). I wouldn't think this was possible, but I seem to have a certain memory that I saw mention of doing just that *somewhere* on the web a few years ago, even though I can't find that mention now. According to the rather unwieldy chart at http://gona.mactar.hu/Commodore/monitor/Commodore_monitors_by_model_number.… , the service manual and schematic for the Commodore-branded 1084 and 1084S-P is "also good for Magnavox ... CM8562". I assume this means the monitors are basically the same underneath. Both of those Commodore monitors support analog RGB. However, when I look at the service manuals provided for those, they specifically state in several places that parts of the manual referring to analog RGB do not apply to the CM8562. Also, according to http://www.retrocomputing.net/parts/commodore/1084S-P1/docs/1084p/readme.txt , there are two chassis designations, which both confusingly include the string "CM8562": CM8505/CM8562/CM8705/CM8762, 8CM505/8CM515/8CM542/8CM643 on the one hand; and 8CM542/CM8562/CM8762 on the other. The latter is noted as only accepting digital RGBI. Physically, both monitors I have have an 8-pin DIN input for the digital RGBI, and a circular area with the legend "lin RGB" underneath. One one monitor, that circular area is perforated; on the other one, it's just a circle but with no indication that it can be easily knocked out. I have not yet opened either one. So... does anyone know if these monitors can in fact be made to accept analog RGB? Or have a way I could tell after opening them up? And, of course, I'd like instructions on just how to do it, if it is possible. -- Eric Christopherson

10 years, 1 month

2 X 13" green screen monitors available

by elson＠pico-systems.com

I have two brand-new 13" green screen monitors available. We got them at work from a surplus source a LONG time ago, I think to replace failing monitors in Graph-on 140 terminals. These are Motorola DS4003-500 units, with AC power supply for either 120 or 240 V operation. They take a card-edge connector for video and sync. (I think they are RS-170 for composite sync, but I'm not completely sure.) I used a scope to pick up the horizontal frequency, it was 53.6 us or ~ 16.5 KHz. I did power one of them up, and it gave a green raster when the brightness was turned up. Anybody interested? Jon

10 years, 1 month

Computer History Museum seeks Lotus/Prentice-Hall software

by cctalk＠snarc.net

Everyone, CHM contacted me. They're seeking copies (or better yet, original disks) of Lotus Development?s Executive Briefing System for the Apple II and Prentice-Hall?s VCN ExecuVision for the IBM PC. The software is not on Bitsavers, Archive.org, etc. Contact: dbrock at computerhistory.org -Evan

10 years, 1 month

Informer 213 terminal - 3274 / 3178 compatible ?

by mattislind＠gmail.com

2016-06-11 22:00 GMT+02:00 Pete Turnbull <pete at dunnington.plus.com>: > On 11/06/2016 18:17, Mattis Lind wrote: > >> I just dig out this little thing form my father stash of various stuff. >> >> When bringing up the setup screen it does not look like the one in the >> > > manual. > > I love the way they felt they had to explain the keyboard at such length. > And explain that the unmarked key is the space bar - I remember when I was > about 6 or 7, having to ask my dad how to get a space on his office > typewriter. > > I was also amused to see they have a section on connecting it to the UK's > BT lines (in the days when things needed BT Approval) so it's obviously > intended for UK use, yet it's pictured with an American power lead. Unfortunately for me my unit does not seem to be the same as the one in the manual. The section on connecting to BT lines is probably still valid since it does have a Rockwell modem board in it. I did find an old Computerworld ad from 1989 which matched. Informer 213 - emulating a 3274 control unit with an attached 3178 mod 2 terminal. Someone with IBM knowledge might share what that means and how the terminal can be used. Anyway. I put together a webpage on the thing: http://www.datormuseum.se/peripherals/terminals/informer-213 /Mattis > > > -- > Pete >

10 years, 1 month

MULTOS/8 progress, and a question...

by JoshD＠LivingComputerMuseum.org

Hi all -- Having overcome my earlier issues with SIMH, I now have MULTOS/8 happily running on the real hardware, with two terminals. (Yay!). I'd like to get the system up to four terminals and here's where I'm running into trouble. I've modified PARAM.PG appropriately (set JOBS to 4, TERMS to 4, and filled in the device codes for the extra terminals). I've rebuilt JOBS.BN and MULTOS, ran BUILD and inserted J1 through J4 and everything runs and the system comes up with 4 terminals (yay!). What isn't working properly are the job devices J1 through J4 -- each of these provides each terminal/user his/her own "virtual" drive on the system's RK05 pack -- effectively it partitions the RK05 into four smaller drives, J1: through J4:. With the two user setup, J1: and J2: are approximately 3000 blocks in size (so each basically gets one side of the RK05 pack). With the four-user setup, I'd expect J1:, J2:, J3: and J4: to each be about 1500 blocks, but they're still reporting as 3000 blocks each. What's more, the actual starting offsets of J1: through J4: appear to be what I'd expect (that is, J1 starts at 0, J2 starts at ~1500, J3 starts at ~3000, etc.). So if I start filling these drives, eventually they clobber each other. The only manual I've found (http://www.pdp8.net/os/multos8/) suggests that these should be appropriately sized (see section 2.1.1) automagically, but this does not seem to be the case; doing a ZERO on them creates a filesystem 3000 blocks in length. I'm digging through the source code to look for clues, but I haven't found anything yet. Anyone fooled with this before? Thanks, Josh

10 years, 1 month

VCFed auction updates

by COURYHOUSE＠aol.com

yes there was a vast difference between him and Jobs Ed# In a message dated 6/14/2016 9:32:18 A.M. US Mountain Standard Time, cctalk at snarc.net writes: > Woz sounds like a nice guy. He's incredibly nice. It always impresses me.

10 years, 1 month

VCFed auction updates

by COURYHOUSE＠aol.com

should have kept the good signed stuff and sold the lesser stuff perhaps? unless you had them sign a stack of them. Ed# In a message dated 6/13/2016 12:00:32 P.M. US Mountain Standard Time, cctalk at snarc.net writes: > One thing I did want to ask was, there was some debate about an original > signed Apple. I couldn't make out if there was or was an announcement or if it did or > did not get sold. The auction has four days remaining: http://www.ebay.com/itm/191890608380. We're also auctioning a signed Sol-20: http://www.ebay.com/itm/191890605553 Both machines are super-clean, fully working, and autographed by their respective inventors (Woz/Felsenstein). All proceeds go to VCFed which is a non-profit. > Also what had northern California go to do with it? Nothing. :) Someone asked, in a wishful thinking moment, if the announcement is about a new VCFestival in southern California. I replied it's not and that northern Calif. is a good place to visit for VCF West this summer.

10 years, 1 month

Accessing a TK50 or TK70 from RT

by rodsmallwood52＠btinternet.com

Hi I have had some success in fixing a couple of TK tape drives. They now load and unload every time you press the button. SFSG now to talk to them from RT. Using the diagnostics on the format (RX50) disk the Identify function shows the drive and by inference its controller. However its calls it MUX. I seem to remember under RT you needed to do a SET or ASSIGN to link it to the driver. Anybody know the correct syntax so I can init the tape and start to read and write files to and from it. Rod

10 years, 1 month

DEC Legacy 2016 15/16 Oct 2016 - Registration now open

by mark＠wickensonline.co.uk

Hi folks The website is now back up at http://declegacy.org.uk and will slowly fill with content in the next couple of months about the upcoming event. Registration is now possible. Kind regards, Mark.

10 years, 1 month

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