Search found 449 matches

by JasonStonier
Fri Jan 29, 2021 9:47 am
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

MadeGray wrote:
Thu Jan 28, 2021 7:28 pm
I’ve a couple of the same SD boards on the way for tomorrow and should be able to hook up and test over the weekend.
I'm happy to send you a printerport board if you want to try it out.
by JasonStonier
Thu Jan 28, 2021 4:22 pm
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

Wheel_nut wrote:
Thu Jan 28, 2021 3:53 pm
You could try taking the Mainboard out of the case and simply powering it from a ... 5V 2.1A Phone Charger!
I just started hyperventilating a bit...
by JasonStonier
Thu Jan 28, 2021 11:36 am
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

Thanks, now I need to explain why I keep my Blu-tac in the fridge. :lol: Wait...doesn't everyone? Another trick is to put some IPA* on the chip and blow it off with a hairdryer sent on cool, or a can of air duster - that can get you 10 degrees of temporary evaporative cooling. *Isopropyl Alcohol, N...
by JasonStonier
Fri Jan 22, 2021 3:30 pm
Forum: introduce yourself
Topic: Hello from the National Museum of Computing
Replies: 12
Views: 922

Re: Hello from the National Museum of Computing

tricky wrote:
Sun Jan 10, 2021 11:26 pm
I'm down near Kings Langley...
Now come on, you're confusing Game Of Thrones with reality.
by JasonStonier
Fri Jan 22, 2021 1:45 pm
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

It was my christmas present from Mrs. S - I bought it, and gave it to her to wrap. I'm told you could hear the eye roll as far away as Edinburgh. IIRC, the 6022BE goes up to 20MHz which is fine for fiddling with the beeb and other such things - the rule of thumb told to me by the grownups at work is...
by JasonStonier
Fri Jan 22, 2021 10:36 am
Forum: 8-bit acorn emulators
Topic: Beeb emulator on Raspberry Pi
Replies: 84
Views: 4770

Re: Beeb emulator on Raspberry Pi

Great work - can't wait to try this out on my CherryPi.
by JasonStonier
Fri Jan 22, 2021 9:32 am
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

I bought a Hantek 6022BE on Amazon for about £50, added a Raspberry Pi running OpenHantek and strapped the whole lot to the back of a spare monitor - making a standalone 'scope. It works really well, and has features typical to much more expensive setups.
by JasonStonier
Fri Jan 22, 2021 9:03 am
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

Do you have access to an oscilloscope? Could it be ripple on the 5v that's getting worse as it all warms up?
by JasonStonier
Thu Jan 21, 2021 4:41 pm
Forum: for sale / freebies
Topic: 3D Printing for the community
Replies: 5
Views: 485

Re: 3D Printing for the community

Hah! I went for a resin machine to complement my FDM one, too... It's chalk and cheese, honestly. The resin is more expensive to run, but produces really high quality parts - I printed a chess piece and gave it to my mate to compare with his injection moulded piece and they were comparable. I bought...
by JasonStonier
Thu Jan 21, 2021 4:22 pm
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

roobarb! wrote:
Thu Jan 21, 2021 11:02 am
And now I have and it works flawlessly, test hook on the LS244 pin 2 and Vcc from pin 1 of the user port. Using @JasonStonier's board..
Well at least I can start sleeping again...
by JasonStonier
Tue Jan 19, 2021 9:07 am
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

My gut feeling has always been that this is a power problem - as nigeb says, I'd try a few different places to pick up 5v and see if that helps.
by JasonStonier
Mon Jan 18, 2021 3:41 pm
Forum: 8-bit acorn hardware
Topic: 3rd hand
Replies: 14
Views: 942

Re: 3rd hand

I have a bit of 2x4 wood with plastic spring clamps screwed to it at intervals. It's awful. Close to useless. But, this thread reminds me of a poem I read decades ago in Electronics Monthly: Do all your soldering on a nice flat brick Not over your lap, is the trick If the hot solder drops In large m...
by JasonStonier
Mon Jan 18, 2021 10:36 am
Forum: for sale / freebies
Topic: Things I don't need - For Sale.
Replies: 11
Views: 2058

Re: Things I don't need - For Sale.

Is there a Gotek firmware for the Yokogawa? :wink:
by JasonStonier
Mon Jan 18, 2021 10:29 am
Forum: for sale / freebies
Topic: BBC-FDC floppy controller for Raspberry Pi - New Batch In
Replies: 134
Views: 9696

Re: BBC-FDC floppy controller for Raspberry Pi - New Batch In

For the three people waiting for this board - so sorry I'm late on it - been an unbelievably hectic couple of weeks at work. I think I have the bits in that I need now so I will try and get on it very soon.
by JasonStonier
Fri Jan 08, 2021 3:38 pm
Forum: general
Topic: Beeb Spotting
Replies: 111
Views: 17083

Re: Beeb Spotting

Makes me want to take a drive up there and save the poor thing.
by JasonStonier
Fri Jan 08, 2021 2:45 pm
Forum: for sale / freebies
Topic: 3D Printing for the community
Replies: 5
Views: 485

3D Printing for the community

I've just invested (the terminology I was careful to use to Mrs. S) in a resin 3D printer. The resolution and speed are pretty good - especially compared to filament printing. I don't need to make a profit from it, but if I can cover costs it will justify the purchase. So, if anyone in this communit...
by JasonStonier
Fri Jan 08, 2021 1:38 pm
Forum: 8-bit acorn software: other
Topic: PCB Designer Watford Electronics / Datapen lightpen
Replies: 13
Views: 793

Re: PCB Designer Watford Electronics / Datapen lightpen

This reminds me of a lightpen I made in about 1992 - it was a design in a library book I found about BBC hardware and programming, and I'd love to find a copy of it now (but the title is lost in the mists of time). I still have the light pen - it connects to the analogue input and uses a light-depen...
by JasonStonier
Fri Jan 08, 2021 9:46 am
Forum: general
Topic: Sophie Wilson awarded BCS Distinguished Fellowship Award
Replies: 8
Views: 510

Re: Sophie Wilson awarded BCS Distinguished Fellowship Award

Found this:

https://www.reddit.com/r/programming/co ... m/c0ewj2c/

...nice thought experiment that explains the process well.

This is of particular interest to me, as I've just started collecting bits for a Gigatron - https://gigatron.io/
by JasonStonier
Fri Jan 08, 2021 9:12 am
Forum: general
Topic: Sophie Wilson awarded BCS Distinguished Fellowship Award
Replies: 8
Views: 510

Re: Sophie Wilson awarded BCS Distinguished Fellowship Award

...she coded the operating system in binary... Can someone intelligent tell me how that is done? (not a rhetorical question). Like, I get how one could put some TTL logic together and mess around with Karnaugh maps and truth tables to do funky stuff with blinkenlights, but to bootstrap yourself fro...
by JasonStonier
Thu Jan 07, 2021 1:07 pm
Forum: wanted
Topic: WANTED: single sided 80 track 5.25" floppy drives
Replies: 10
Views: 579

Re: WANTED: single sided 80 track 5.25" floppy drives

scarybeasts wrote:
Thu Jan 07, 2021 10:48 am
Although it's fun to accumulate...
I keep telling my wife this, but apparently it's not.

"When are you EVER going to use that?"
"That's irrelevant, it's a Roland DXY pen plotter circa 1984, why would you NOT want one?"

Etc.
by JasonStonier
Thu Jan 07, 2021 10:30 am
Forum: wanted
Topic: WANTED: single sided 80 track 5.25" floppy drives
Replies: 10
Views: 579

Re: WANTED: single sided 80 track 5.25" floppy drives

So, I've got a couple of Cumana spare, they're both Tandon 5¼" TM65-1L - SSDD - but from what I can see that's 40-track. I bought them just to preserve the tech, and they're untested and probably of no use to you, but considering what you've done for the community you can have one for free if i...
by JasonStonier
Wed Jan 06, 2021 11:08 am
Forum: wanted
Topic: WANTED: single sided 80 track 5.25" floppy drives
Replies: 10
Views: 579

Re: WANTED: single sided 80 track 5.25" floppy drives

I've got a few drives knocking about, but I don't know if I have a single sided. Let me check and get back to you.
by JasonStonier
Wed Jan 06, 2021 9:31 am
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

I'm sick of looking at this export Beeb and its shiny keyboard anyway. :wink: Bloody foreign computers, stealing our good British keyboard grime. In unrelated news, since those of us in the UK are now only allowed to use genuinely British products for the rest of our natural lives, my campaign to g...
by JasonStonier
Tue Jan 05, 2021 6:38 pm
Forum: general
Topic: Poor quality PCBs recently from Elecrow
Replies: 14
Views: 1301

Re: Poor quality PCBs recently from Elecrow

DaveBurke wrote:
Tue Jan 05, 2021 1:55 pm
You're welcome to one for the price of postage, I make no guarantees of it actually being anything more than a cool placemat though :)
I'll definitely take you up on that, thanks. PM sent :D
by JasonStonier
Tue Jan 05, 2021 6:33 pm
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

Do both of the Printer Port adapters work in your standard BBC B? Good point - mine would be a quick test as you don't need to do the wiring mod - just...if you've taken the grabber wires off, make sure you put them on the right way round as the board I sent you doesn't have a keyed header ('produc...
by JasonStonier
Tue Jan 05, 2021 1:21 pm
Forum: general
Topic: Poor quality PCBs recently from Elecrow
Replies: 14
Views: 1301

Re: Poor quality PCBs recently from Elecrow

Ooh nice, I fancy doing a Gigatron myself - did you just get the one board or do you have any for sale?

Although apparently, and I quote, "you've got hundreds of projects to finish - can you not PLEASE just finish one before you start something else...?"
by JasonStonier
Tue Jan 05, 2021 1:18 pm
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

Wheel_nut wrote:
Tue Jan 05, 2021 12:29 pm
... or just pick it up from the User port Pins 1 or 3.
Also a good idea :lol:
by JasonStonier
Tue Jan 05, 2021 12:07 pm
Forum: 8-bit acorn hardware
Topic: Export Beeb MMC Corruption
Replies: 107
Views: 3838

Re: Export Beeb MMC Corruption

...check you are getting a reliable Vcc of 5V on Pin 26. Also check that you have continuity between Printer Port Pin 26 and User Port Pins 1 and 3. That's what I think is happening as well - my guess is that the voltage at pin 26 is dropping under load. I'd look for a pull up resistor somewhere on...
by JasonStonier
Tue Jan 05, 2021 10:55 am
Forum: 8-bit acorn hardware
Topic: Watford ROM/RAM problem
Replies: 11
Views: 518

Re: Watford ROM/RAM problem

...the RAM RnW signal is just a buffered version of RnW from the 6502. It really should be gated with Phi2, so that the write happens in the second half of the clock cycle when the address is stable. So, if I understand you, a limitation of the Watford SWR board is that it blatts the bits into RAM ...
by JasonStonier
Tue Jan 05, 2021 9:47 am
Forum: 8-bit acorn hardware
Topic: Watford ROM/RAM problem
Replies: 11
Views: 518

Re: Watford ROM/RAM problem

I'd really like to understand why this is - maybe Hoglet would have a view.

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