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
--- 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
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.)
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/
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
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=-
--- 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
>
> 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