test-drb June 2009

test-drb@ccmp.vtda.org

233 participants
404 discussions

Looking for a Needham's PB-10 EPROM programmer

by ian_primus＠yahoo.com

Does anyone happen to have a spare Needham's PB-10 EPROM programmer they'd be willing to part with? It's an old ISA based programmer, but I've come to really like it. I have one, and I use it an awful lot. But it's gotten to the point where it would be extremely handy to have another one that I could install into a portable computer for use elsewhere. So, if anyone has one they'd be willing to sell/trade/etc, let me know, I can sure put it to use. -Ian

15 years, 3 months

Concurrent 3280 (80s vintage realtime mini) on eBay

by wmaddox＠pacbell.net

Item # 220437075128 . Two days to go. --Bill

15 years, 3 months

PDP-11 Controller needed to use a couple of RX33 drive

by spedraja＠ono.com

I am searching one controller to use a couple of RX33 in one PDP11-23/PLUS. Someone knows what could I use ? Regards Sergio

15 years, 3 months

NEC uPD7220/GDC Design Manual

by lynchaj＠yahoo.com

--- On Wed, 6/10/09, Andrew Lynch wrote: > > From: Andrew Lynch > Subject: NEC uPD7220/GDC Design Manual > To: cctalk at classiccmp.org > Date: Wednesday, June 10, 2009, 8:45 PM > > Hi! Does anyone have the NEC uPD7220/GDC Design Manual? > > I am looking for one as part of research on building a home > brew NEC 7220 video board. > > Thanks and have a nice day! > > Andrew Lynch I waited with a response, assuming that somebody has the manual you are looking for. I am not 100% sure, but I might have that manual. I am sure that I do have _a_ NEC 7220 GDC manual, and I remember (15+ years ago) that I used that manual to write a BASIC program to calculate register values based on the timing parameters for the VDU. I don't remember if the manual contained hardware info, it might. Next time I am in the old house, I will search for the manual in the attic. Perhaps this weekend ... - Henk. -----REPLY----- Hi Henk! Thanks! Any help you can provide is greatly appreciated. I am interested and researching the possibility of a NEC uPD7220 home brew video board. The SY6545 video board I made for the N8VEM project is working out really well but it is just a simple character only display. Ideally, you could scan the book if that is possible but if not would you be interested in selling it? I contacted NEC and they didn't know anything about it. Apparently very few people still have the manual and bitsavers doesn't have it either. I did some library searches but no luck although it is cited as a reference in a couple of college papers like masters thesis, etc. What I really need to know is if I can implement a simple circuit using few enough 74LS TTL ICs to fit on a Eurocard ECB board. That means it can't be more than about 30 maximum. Using high capacity SRAMs should help but I think it requires some funky latching mechanisms to share the video address and data lines. I looked at the NEC APC video board and it is just huge. I hope that is not an indication of the complexity needed! Thanks and have a nice day! Andrew Lynch

15 years, 3 months

Portable ASR-33?

by evan＠snarc.net

Anyone know which model of the ASR-33 (perhaps from a different company) was sold in a portable case circa 1972, with one half containing the teletype and the other half containing an acoustic modem? (No, I don't mean the later T.I. Silent 700.)

15 years, 3 months

cool article

by aliensrcooluk＠yahoo.co.uk

I personally like #1,#4, #13 and #15 :) Regards, Andrew B aliensrcooluk at yahoo.co.uk --- On Mon, 15/6/09, Brian Lanning <brianlanning at gmail.com> wrote: From: Brian Lanning <brianlanning at gmail.com> Subject: cool article To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Date: Monday, 15 June, 2009, 6:25 PM I'm particularly impressed with the TI-99/4A in problem #13 http://technologizer.com/2009/06/14/fifteen-classic-pc-design-mistakes/

15 years, 3 months

Fwd: [alt.sys.pdp11] buy

by legalize＠xmission.com

This message has been forwarded from Usenet. To reply to the original author, use the email address from the forwarded message. Date: Wed, 24 Jun 2009 09:09:08 -0700 (PDT) Groups: alt.sys.pdp11 From: padilla <juanferzz at yahoo.com> Org: http://groups.google.com Subject: buy Id: <66e20698-e1d4-4101-8072-0804a08bc325 at s6g2000vbp.googlegroups.co m> ======== Need 5 DECtape II, TU58-K with the price of each one as soon as possible I would like to send me a quote if possible greetings

15 years, 3 months

VT52 emulator (was: Fw: Still Falling for Tetris, 25 Years After Its Birth )

by aliensrcooluk＠yahoo.co.uk

Cool video. Thanks for the link :) Regards, Andrew B aliensrcooluk at yahoo.co.uk --- On Sat, 13/6/09, Alexander Voropay <alec at sensi.org> wrote: From: Alexander Voropay <alec at sensi.org> Subject: Re: VT52 emulator (was: Fw: Still Falling for Tetris, 25 Years After Its Birth ) To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Date: Saturday, 13 June, 2009, 9:08 PM 2009/6/4 Alexander Voropay <alec at sensi.org>: >>> The 0177 character was a 6x8 block. >> >> The VT52 ignored 0177 on receipt, so this game won't work on any decent >> VT52 emulator. You'd have to guess where the pieces were. :-) Sergei Frolov made a video playing this TETRIS game: http://www.youtube.com/watch?v=O0gAgQQHFcQ Rather bad VTY/CAM interference, nice keyboard "clicks" :) Look at 2:25, the russian DVK (a PDP-11 clone) boots. -- -=AV=-

15 years, 3 months

ISA MFM disk controllers

by ian_primus＠yahoo.com

--- On Tue, 6/23/09, Paxton Hoag <innfoclassics at gmail.com> wrote: > WX-1 is 2 MFM hard drives only, WX-2 is hard drives plus > two floppys. > My CSC Hard Drive manual says it is an 8 bit contoller for > two hard > drives. To format use G=C800:5 (Why is > that so familiar!!!) OK, that makes sense. I ended up just using the WX-1 because I was familiar with it. I was able to format the drive from debug no problems, and the Compaq boots from it, despite not using the Compaq setup program. > >From the book the default jumpers on the WD 1002A-WX1 > are > W3,W4-2 & 3, W6-2 & 3, W8-2 & 3, S1-8 (AT > Mode) Hmm, I didn't change any of the jumpers on the card, I'll have to check those when I get home. I assume this just changes the controller to work with an AT BIOS? > I think you will need the compaq set up disks. I still have > a set but > not sure where they are. I might be able to locate them if > you need me > to. A kind listmember is already sending me a copy. I found _a_ setup program, but it's clealy not the one for this computer. At least I was able to change the time and date, but it's options for the hard disk were really limited. Right now I just have the 'fixed disk' disabled in the setup. The Compaq boots just fine from the controller as it is now. > I think an interleave of 3 would be OK as it is an XT > class > controller. But, as mentioned, Spinrite can optimize it for > you. The > nec drive is an AT class drive at 28 ms. It should work > fine. It does work, I just wonder if changing the interleave could make it any faster. I mean, the computer isn't particularly fast in any case, but anything to improve hard disk performance is a good thing. Do you have a version of Spinrite that will work? I was only able to find version 6.0 on the internet, and it won't even load on the 286. Just hangs. -Ian

15 years, 3 months

Portable ASR-33

by rmu_scada＠yahoo.com

> > Anyone know which model of the ASR-33 (perhaps from a > different company) > was sold in a portable case circa 1972, with one half > containing the > teletype and the other half containing an acoustic > modem? (No, I don't > mean the later T.I. Silent 700.) > Anderson Jacobson perhaps. See http://www.pdp8.net/asr33/pics/old_sound.shtml. Not exactly portable, but it was on wheels. I had one at one time but not with wood case. It came with the A-C modem but that is long gone (kick self, repeat...) Joe

15 years, 3 months

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test-drb June 2009