Search found 2505 matches

by jonb
Fri May 10, 2019 2:21 pm
Forum: general
Topic: Today I received.....
Replies: 5184
Views: 381979

Re: Today I received.....

I've given up on Dave as his whiny voice is wearing after a short while.
by jonb
Fri May 10, 2019 7:29 am
Forum: general
Topic: Today I received.....
Replies: 5184
Views: 381979

Re: Today I received.....

Is that the Rigol "Death Star" Special Edition, Elminster?

Whooooar!
by jonb
Tue Apr 30, 2019 7:49 am
Forum: general
Topic: DRAGON USER gripes about the Computer Literacy Programme.....
Replies: 52
Views: 1067

Re: DRAGON USER gripes about the Computer Literacy Programme.....

...Dragon Data, by most counts the third most successful British home computer manufacturer... Oh, come on. When I worked in a computer shop in the '80s we couldn't give the Dragons away, they were that bad. I have one here. it uses a minority (in the home computer market) processor, has a cruddy v...
by jonb
Wed Apr 17, 2019 7:17 am
Forum: off-topic
Topic: Blinged up BBCs
Replies: 59
Views: 1327

Re: Blinged up BBCs

Ah, but there was a red Memotech, made for an unsuccessful sales bid to the Russian education authorities: http://www.primrosebank.net/computers/mtx/photos/mtx-in-red-case_crop.jpg I have seen and handled this machine at one of the Memotech meets. It is proper rare. At the time I felt as if I was to...
by jonb
Tue Apr 16, 2019 9:04 am
Forum: off-topic
Topic: Blinged up BBCs
Replies: 59
Views: 1327

Re: Blinged up BBCs

Errrmmm... excuse me.. cough cough.. https://pro2-bar-s3-cdn-cf6.myportfolio.com/1ad8b59e38ee001d3608a6d55ee2a59a/ae905bc6a3ad37d2ee28b1d48e1bad0db4cdffd9d5d319e8b6418b08ca5e27aafda1f0674a8f9851_rw_1920.jpg From https://xyqom.myportfolio.com/cgi-memotech-mtx512-with-fdx - these are not actual photos...
by jonb
Mon Apr 15, 2019 7:53 pm
Forum: other vintage computer hardware, software and games
Topic: Those Spectrum nerds, eh?
Replies: 26
Views: 550

Re: Those Spectrum nerds, eh?

Well, I rather like my QL keyboard. But it is a very late model. One reason the keys are good compared to the Spectrum Plus was the type of plastic they used (at least in mine). More solid. By the way, CP/M also runs on 8086 processors - it was called CP/M-86 - and on 68000 processors - CP/M-68K. No...
by jonb
Mon Apr 15, 2019 7:46 pm
Forum: acorn atom and system
Topic: Atom Noise Killer @ 2MHz
Replies: 28
Views: 617

Re: Atom Noise Killer @ 2MHz

Gotta say, that's some impressive work Dave. =D> =D> =D>
by jonb
Mon Apr 15, 2019 12:31 pm
Forum: other vintage computer hardware, software and games
Topic: Those Spectrum nerds, eh?
Replies: 26
Views: 550

Re: Those Spectrum nerds, eh?

Hmm? I recall that the Microdrives worked quite well on the Spectrum. It was on the QL that they failed, thanks to a badly ported set of drivers (allegedly). Later QLs were much better, and had surprisingly good keyboards. In other words, it might look like a Spectrum Plus keyboard, but it feels lik...
by jonb
Mon Apr 15, 2019 9:21 am
Forum: off-topic
Topic: LOLPRICE
Replies: 2930
Views: 253909

Re: LOLPRICE

Looks legit to me. He is a local business (to me) with a company registration on the listing. A proper auction with a 99p start.
by jonb
Mon Apr 15, 2019 9:16 am
Forum: other vintage computer hardware, software and games
Topic: Those Spectrum nerds, eh?
Replies: 26
Views: 550

Re: Those Spectrum nerds, eh?

Though I must admit this Spectrum add-on's pretty damn cool. Just slot it in the back and you've a proper disk drive, joystick and video ports plus non-wobble support base to keep it secure. If you could only afford some modular arrangement to build your computer piecemeal, I'd say this was a prett...
by jonb
Sun Apr 14, 2019 6:04 pm
Forum: off-topic
Topic: Blinged up BBCs
Replies: 59
Views: 1327

Re: Blinged up BBCs

He should change his name to "blotchy".. :lol:

Looks proper cool though. Much better than cream.
by jonb
Sat Apr 13, 2019 12:03 pm
Forum: projects
Topic: Sentinel PC Port
Replies: 8
Views: 336

Re: Sentinel PC Port

There is another five note stanza (at least, on the ST version) that you ought to incorporate. It's the one when he transfers to another body.

https://www.youtube.com/watch?v=9V_pgo3vgiI
by jonb
Thu Apr 11, 2019 6:50 am
Forum: off-topic
Topic: LOLPRICE
Replies: 2930
Views: 253909

Re: LOLPRICE

The ULTRA RARE one (as I am sure most people know) has been listed for years by "Our Motorcycling Friend".

But is it ultra rare? I suppose if it were a Science of Cambridge MK14 then "ultra rare" might be pertinent, but surely not an Atom.
by jonb
Tue Apr 09, 2019 5:55 pm
Forum: other vintage computer hardware, software and games
Topic: Megastor 8" drive unit
Replies: 66
Views: 1535

Re: Megastor 8" drive unit

Cheers Mark! As you can see from the video, the S100 box is up as well. It's a really nice rig.
by jonb
Tue Apr 09, 2019 5:47 pm
Forum: other vintage computer hardware, software and games
Topic: Megastor 8" drive unit
Replies: 66
Views: 1535

Re: Megastor 8" drive unit

And now, for Kazzie, a quick youtoobz video...

https://youtu.be/THLTPThV_UU
by jonb
Tue Apr 09, 2019 5:45 pm
Forum: other vintage computer hardware, software and games
Topic: S-100 box time
Replies: 17
Views: 500

Re: S-100 box time

Sorry about that, Mark.. "linear" is common parlance for "not switching" in my book. As in "old school transformer, rectifier (full or half wave) and big capacitors for smoothing", but I can see it's not accurate language. Ultimately it is regulated - each board has regulation built in. I'm the same...
by jonb
Tue Apr 09, 2019 11:09 am
Forum: other vintage computer hardware, software and games
Topic: S-100 box time
Replies: 17
Views: 500

Re: S-100 box time

As you will see, I am also very hasty. Too hasty. Whilst I was looking at the memory board, wondering if a track had burned out or some such, I noticed that the crystal wasn't seated properly in its socket. Pushed it home and whacked the board back into the chassis and it works again. Phew... Pretty...
by jonb
Tue Apr 09, 2019 10:22 am
Forum: other vintage computer hardware, software and games
Topic: S-100 box time
Replies: 17
Views: 500

Re: S-100 box time

Tell me about it.. I'm not sure if that click was real or imagined, but when I "heard" it I looked at the machine and it'd locked up, never to boot again save by the virtue of another expensive repair. I know it's the DRAM board, there are errors all over the memory map and the 12v/5v/-5v voltage ra...
by jonb
Tue Apr 09, 2019 10:16 am
Forum: other vintage computer hardware, software and games
Topic: Megastor 8" drive unit
Replies: 66
Views: 1535

Re: Megastor 8" drive unit

(Friendly videography hint: holding the camera in landscape mode means the video will fit better when watched on a computer screen ;) ) Yeah, I know. Problem is, I needed to get the camera on my phone into some tight spaces so I held it upright. Looks a bit pants I realise... will do it in landscap...
by jonb
Mon Apr 08, 2019 7:39 pm
Forum: other vintage computer hardware, software and games
Topic: Megastor 8" drive unit
Replies: 66
Views: 1535

Re: Megastor 8" drive unit

Kazzie, I'm going to post another video of them working. So smooth..
by jonb
Mon Apr 08, 2019 5:31 pm
Forum: other vintage computer hardware, software and games
Topic: Megastor 8" drive unit
Replies: 66
Views: 1535

Re: Megastor 8" drive unit

Quick follow up on this unit - the replacement (used) motor arrived today from Switzerland (very expensive shipping!) and it's fitted. Thankfully it works! So now the Megastor is restored completely, and I am very happy with it. Sounds good, goes well. Just need to fix up the S100 box...

:D
by jonb
Mon Apr 08, 2019 3:34 pm
Forum: other vintage computer hardware, software and games
Topic: WTB 4116 DRAM chips
Replies: 0
Views: 64

WTB 4116 DRAM chips

Hi

Has anyone got some 4116 DRAMs going spare? I need to resurrect a memory card that just popped (for no good reason).

Cheers
JonB
by jonb
Mon Apr 08, 2019 2:43 pm
Forum: other vintage computer hardware, software and games
Topic: S-100 box time
Replies: 17
Views: 500

Re: S-100 box time

After a short soak test there was a small CLICK and it all died again. :evil:

Now it is back to not booting! Grrr..
by jonb
Mon Apr 08, 2019 2:27 pm
Forum: other vintage computer hardware, software and games
Topic: S-100 box time
Replies: 17
Views: 500

Re: S-100 box time

So, it's "back to the ICE" and trying to work out what is happening. I performed some tests in the monitor with a boot disk. The machine seems to not want to read sectors, so I swapped out the disk controller (uPD765), then the buffer chips to no avail. Then I thought I'd put the 64K RAM card in and...
by jonb
Mon Apr 08, 2019 9:49 am
Forum: other vintage computer hardware, software and games
Topic: S-100 box time
Replies: 17
Views: 500

Re: S-100 box time

It's all odd as I said. Those 3 incorrect bytes in the PROM affect the startup / reset circuit, but as it has worked I am wondering if they were altered on purpose. But the later manual (which is on bitsavers - I have the original paper manual with this board) matches what I have. Hmm. I've put the ...
by jonb
Fri Apr 05, 2019 5:03 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 2930
Views: 253909

Re: LOLPRICE

Looks like a hair to me. I did try to report the item (misleading to the max, new my backside!) but the report form does not have the right options. Look at the grime around the plug - I agree it's well used. He doesn't even say if it works... Didn't Spectrum's come without a plug fitted anyway… St...
by jonb
Fri Apr 05, 2019 3:24 pm
Forum: other vintage computer hardware, software and games
Topic: S-100 box time
Replies: 17
Views: 500

Re: S-100 box time

Now, this is most weird. I put the PROMS back in and retested. I can see the memory now, and the machine is seemingly waiting for some input from the serial port. I can't explain it... but let's try and oblige it.
by jonb
Fri Apr 05, 2019 2:57 pm
Forum: other vintage computer hardware, software and games
Topic: S-100 box time
Replies: 17
Views: 500

Re: S-100 box time

Good point. Because the programmer complains mightily if pins are not connected. Actually, it complains about two pins anyway for some reason (and yes, they are connected). So anyway... Expected: 0F 0F 0F 0F | 79 7A 7C 47 | 4E 4E 4E 4E | 4E 4D 4B 47 | 0F 0F 0F 0F | 0F 0F 0F 0F | 4E 4E 4E 4E | 0F 0F ...
by jonb
Fri Apr 05, 2019 1:33 pm
Forum: other vintage computer hardware, software and games
Topic: S-100 box time
Replies: 17
Views: 500

Re: S-100 box time

Further investigation (with the Z80-ICE) shows that the data bus is delivering FF on all addresses, even the ROM's addresses. Ho hum. The CPU board, a Teletek FD-1 (really, a SBC with 1K of RAM) uses an 82S123 32 byte bipolar PROM to implement some of the memory selection logic. I need to pull it, t...
by jonb
Fri Apr 05, 2019 1:23 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 2930
Views: 253909

Re: LOLPRICE

At least the Electron is in nice condition. Unlike this Spectrum which has apparently only ever been out of the box once! https://www.ebay.co.uk/itm/Sinclair-ZX-Spectrum-48K-Original-Box-Power-Supply-Never-been-used-MINT/183761453332?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D56831%2...