stardot.org.uk

Hi Graham Welcome to StarDot :D You may wish to say hello in the introduce yourself section . Private messages (PMs) are disabled for new members at first. However you can ask for PMs to be enabled by using the Contact us link (envelope icon) at the bottom of every page. This sends a message to the ...

Yes, there should be no problem with parking. So no need to worry.

Mark

A short tour around the room... 437E63D8-B90B-4B52-AF15-5DDBD3C7BD8B.jpeg D47BEBD7-FB89-4D4E-BD05-84B7C9E58B8E.jpeg 346439A5-374D-40B3-B153-B5801799A20A.jpeg 6D931EF2-3014-4B22-9C49-3C05A90E998B.jpeg 4CE873A7-F4C2-45B9-A28D-8C7E5007C44E.jpeg 81559F16-0300-4AD5-96BB-A0997B7896A2.jpeg E85FBF6E-6B8F-4D...

Luckily none of these people were any the wiser about possible exciting capacitor situations: And amazingly, these were taken around lunchtime

Mark

Hmm, have I asked a perhaps biased audience what to do here? :shock: We, here, biased :P Hmm, he said as he looked at the three model B’s and one Master that he had brought to the ABug meet-up, never mind the other Beeb machines left at home... [not to mention the other 8 bit and 16/32 bit computer...

Hi Dave Looking back through this thread, I spot that I may have a use for the edge-connector socket. https://stardot.org.uk/forums/download/file.php?id=49306&mode=view https://stardot.org.uk/forums/download/file.php?id=49307&mode=view How many do you have? If you have more than one, I would like tw...

SimonSideburns wrote: ↑

Thu Sep 19, 2019 10:22 pm

There's always another event in the future.

Yes, ABug South 22 to 24 November 2019

Mark

Hi Simon

I was not being critical. I just wanted to post the weather forecast so other people could see how unseasonably warm it is going to be...

Mark

SimonSideburns wrote: ↑

Wed Sep 18, 2019 3:26 pm

I'm thinking I'm going to have to cancel my table.

SimonSideburns wrote: ↑

Wed Sep 18, 2019 3:26 pm

This time we were hoping the temperatures would be more sensible but it looks to be another scorcher.

The current forecast: Mark

You keep her on a table

Are you still looking for faulty DRAM? I've got a faulty Mostek MK4516N-10 that I pulled from my beeb yesterday if it's of any interest, otherwise it'll be going in the bin. Hi Ken Yep, I’m still after any / all faulty DRAM chips as per my original post. I’ll send you a PM with my address. Mark

Mark

IIRC, the 6502 ignores maskable interrupts at power-up. However early on in the OS code, the OS briefly enables interrupts.

Mark

We’ve see something similar before with a misbehaving Beeb, but nothing wrong in the reset circuits. Is the NMI line high (correct) or is something pulling it low? Also test the IRQ line with your scope, just to check that that is normal. Also check / search the hardware thread, as I say, this kind ...

Some fun facts about how ‘disk’ systems work in a Beeb... There are three parts. First off, the disk drive and connecting cable for the control and data signals. These connect via the interface connector on the Beeb. Then inside the Beeb, you need some electronics to interface electrically with the ...

Groot wrote: ↑

Fri Sep 13, 2019 1:49 pm

Hi Jason - I was planning to come along to the event, car sharing with Michael @firthmj, but see the event is now declared full

Hi Mark

Please do come and say hello. I’m sure we can squeeze you in

Mark

What's the best way of posting pics/vids via the forum? Below the text editor box are two tabs, the left hand one gives ‘Options’, the one just to the right is ‘Attachments’, so click on ‘Attachments’. Then click on the ‘Add files’ button. What happens next depends on your system, but it should all...

jbnbeeb wrote: ↑

Sun Jul 07, 2019 6:51 pm

Somewhere in the main hall...

32. tricky (Richard) Arriving Saturday morning, leaving Sunday afternoon

Is this a new game, “hunt the tricky”?

Mark

The “tape” signals used by some home computers are essentially digital pulses. Hence it is possible to transfer (load/save etc.) without going via analogue audio levels. Of course, not very practical for existing machines, as it would require modifications to their circuitry. Think of it as a serial...

Hi Dave

I’m interested in the 9” video monitor.
Would it be possible to bring it along to Cambridge?

Mark

Perfect for a Car Battery Charger. !0V ac rectified - 10 x 1.414 = 14.14V dc. That should charge a Car Battery in a couple of hours. :D Surely it's x 1/root(2) not x root(2), it has to be less than the peak as you're filling in the troughs by chopping off the peaks. So 10VAC = 7V DC. No it's x Root...

Wim - Thought you might, I've actually ordered some Elk key switches as a plan of last resort - the only problem here is that I can't install such a fix for the M key, as a switch here would interfere with the space bar mechanism. I believe I've sorted some original posts thanks to Boydie though, a...

I'm not sure there are many Vic-20 owners in this parish

Mark

I’m still wondering what on earth I can use 30A at 10V AC for....

Mark

marcusjambler wrote: ↑

Tue Sep 10, 2019 2:13 pm

Hi Dave

Is that IDC a Beeb pcb user port connector?

The one with ears looks like a 20 way, so yes, it’s the correct size for a User Port.

Mark

Never mind an attic, at this rate I’m thinking Dave’s got an entire warehouse up there

Mark

Them there holes

I don’t think I’ve ever see so many added ventilation holes that have been ‘hand’ made in a production computer!

Roland in the past has repaired cases, filled in holes and then painted the case a nice bright colour click the linky...

Mark

Assuming it’s a standard Beeb and not got a custom VideoProc / Video ULA... Ideally you just need FIVE digital inputs, channels as follows: Red TTL Video Green TTL Video Blue TTL Video Vertical TTL Sync. Horizontal TTL Sync The reason for capturing the separate synchronisation signals, is so that it...

danielj wrote: ↑

Mon Sep 09, 2019 8:57 pm

I expect everyone with an Electron has a copy!

Or multiple copies...