Search found 9070 matches

by 1024MAK
Sat Sep 21, 2019 7:43 pm
Forum: for sale / freebies
Topic: New Batch ROM / RAM Expansion Board for BBC B
Replies: 6
Views: 573

Re: New Batch ROM / RAM Expansion Board for BBC B

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 ...
by 1024MAK
Sat Sep 21, 2019 5:59 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 217
Views: 7279

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

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

Mark
by 1024MAK
Sat Sep 21, 2019 1:37 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 217
Views: 7279

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

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...
by 1024MAK
Sat Sep 21, 2019 1:18 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 217
Views: 7279

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

Luckily none of these people were any the wiser about possible exciting capacitor situations:
EB2D6342-045A-406C-883B-7E70C902228B.jpeg
02661684-417E-41EC-9349-AD9D06314C17.jpeg
And amazingly, these were taken around lunchtime :shock:

Mark
by 1024MAK
Fri Sep 20, 2019 10:38 pm
Forum: hardware
Topic: A difficult decision
Replies: 16
Views: 283

Re: A difficult decision

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...
by 1024MAK
Fri Sep 20, 2019 3:18 am
Forum: for sale / freebies
Topic: More attic finds . . . Updated :o)
Replies: 31
Views: 989

Re: More attic finds . . . Updated :o)

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...
by 1024MAK
Thu Sep 19, 2019 11:33 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 217
Views: 7279

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

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 :wink:

Mark
by 1024MAK
Wed Sep 18, 2019 8:04 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 217
Views: 7279

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

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
by 1024MAK
Wed Sep 18, 2019 6:09 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 217
Views: 7279

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

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:
6DC0E247-6B9B-424E-94FE-E16DFFFB1993.jpeg
Cambridge weather forecast
Mark
by 1024MAK
Sun Sep 15, 2019 12:17 pm
Forum: wanted
Topic: Faulty DRAM chips wanted!
Replies: 8
Views: 988

Re: Faulty DRAM chips wanted!

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
by 1024MAK
Sat Sep 14, 2019 11:02 pm
Forum: hardware
Topic: Beeb Power Up Issue
Replies: 26
Views: 411

Re: Beeb Power Up Issue

👍 :D

Mark
by 1024MAK
Sat Sep 14, 2019 5:33 pm
Forum: hardware
Topic: Beeb Power Up Issue
Replies: 26
Views: 411

Re: Beeb Power Up Issue

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

Mark
by 1024MAK
Sat Sep 14, 2019 3:43 pm
Forum: hardware
Topic: Beeb Power Up Issue
Replies: 26
Views: 411

Re: Beeb Power Up Issue

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 ...
by 1024MAK
Sat Sep 14, 2019 1:34 pm
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 307

Re: Epson SD-521 DD errors/fail

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 ...
by 1024MAK
Sat Sep 14, 2019 9:42 am
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 217
Views: 7279

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019. FULL

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 :wink:

Mark
by 1024MAK
Fri Sep 13, 2019 11:39 pm
Forum: hardware
Topic: Epson SD-521 DD errors/fail
Replies: 32
Views: 307

Re: Epson SD-521 DD errors/fail

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...
by 1024MAK
Fri Sep 13, 2019 2:01 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 217
Views: 7279

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019. FULL

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”? :lol:

Mark
by 1024MAK
Fri Sep 13, 2019 12:17 pm
Forum: other vintage computer hardware, software and games
Topic: ZX Spectrum next... Anybody backing ?
Replies: 143
Views: 13806

Re: ZX Spectrum next... Anybody backing ?

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...
by 1024MAK
Fri Sep 13, 2019 12:03 pm
Forum: for sale / freebies
Topic: More attic finds . . . Updated :o)
Replies: 31
Views: 989

Re: More attic finds . . . Updated :o)

Hi Dave

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

Mark
by 1024MAK
Fri Sep 13, 2019 11:44 am
Forum: for sale / freebies
Topic: More attic finds . . . Updated :o)
Replies: 31
Views: 989

Re: More attic finds . . .

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...
by 1024MAK
Wed Sep 11, 2019 2:19 pm
Forum: acorn atom and system
Topic: A slightly dog-eared Atom
Replies: 11
Views: 301

Re: A slightly dog-eared Atom

:lol:
by 1024MAK
Tue Sep 10, 2019 10:40 pm
Forum: acorn atom and system
Topic: A slightly dog-eared Atom
Replies: 11
Views: 301

Re: A slightly dog-eared Atom

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...
by 1024MAK
Tue Sep 10, 2019 10:37 pm
Forum: other vintage computer hardware, software and games
Topic: Help needed with VIC20
Replies: 4
Views: 266

Re: Help needed with VIC20

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

Mark
by 1024MAK
Tue Sep 10, 2019 3:53 pm
Forum: for sale / freebies
Topic: More attic finds . . . Updated :o)
Replies: 31
Views: 989

Re: More attic finds . . .

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

Mark
by 1024MAK
Tue Sep 10, 2019 3:51 pm
Forum: for sale / freebies
Topic: More attic finds . . . Updated :o)
Replies: 31
Views: 989

Re: More attic finds . . .

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
by 1024MAK
Tue Sep 10, 2019 3:49 pm
Forum: for sale / freebies
Topic: More attic finds . . . Updated :o)
Replies: 31
Views: 989

Re: More attic finds . . .

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

Mark
by 1024MAK
Tue Sep 10, 2019 3:46 pm
Forum: acorn atom and system
Topic: A slightly dog-eared Atom
Replies: 11
Views: 301

Re: A slightly dog-eared Atom

Them there holes :lol:

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

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

Mark
by 1024MAK
Tue Sep 10, 2019 3:34 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 621

Re: Capturing interlaced / 50Hz video

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...
by 1024MAK
Tue Sep 10, 2019 6:16 am
Forum: for sale / freebies
Topic: "Start Programming with the Electron" book. Free for postage *GONE*
Replies: 5
Views: 227

Re: "Start Programming with the Electron" book. Free for postage

danielj wrote:
Mon Sep 09, 2019 8:57 pm
I expect everyone with an Electron has a copy!
Or multiple copies...