Search found 4599 matches

by MartinB
Sun Feb 18, 2018 11:20 pm
Forum: off-topic
Topic: Thermionic Valves
Replies: 20
Views: 539

Re: Thermionic Valves

Modern mechanically-scanned radars use a 'valve' called a Travelling Wave Tube (TWT) but the latest generation of 'no moving parts' systems are electronically scanned and use clusters of Transmit/Receive Modules (TRMs) - small low-power solid-state RF transmitters which, when employed in numbers, fo...
by MartinB
Sat Feb 17, 2018 9:15 pm
Forum: stardot.org.uk
Topic: Stardot logo fixed and now spud and banana free!
Replies: 57
Views: 962

Re: Stardot logo infected with spuds!

Excellent Roland, I’m good on IOS and Windows =D>

(but I now feel somehow inadequate because my design isn’t one of your five-a-day.... :-k )
by MartinB
Sat Feb 17, 2018 10:52 am
Forum: stardot.org.uk
Topic: Stardot logo fixed and now spud and banana free!
Replies: 57
Views: 962

Re: Stardot logo infected with spuds!

Daniel - I haven't found it yet, I think I need to go back one more netbook #-o :roll:

I think you need the transparent vector one? Dave J (Keckse Bak), if you are looking in and in case I'm struggling, could you post it please :)
by MartinB
Fri Feb 16, 2018 8:10 pm
Forum: stardot.org.uk
Topic: Stardot logo fixed and now spud and banana free!
Replies: 57
Views: 962

Re: Stardot logo disappeared!

I should be able to but I think the suitable quality images are on a previous computer which I have, but will need to dig out and dust off - might be a bit later then or even tomorrow. If Dave J is looking in, he also has copies because he did all the technical magic to sharpen it up.
by MartinB
Fri Feb 16, 2018 7:34 pm
Forum: stardot.org.uk
Topic: Stardot logo fixed and now spud and banana free!
Replies: 57
Views: 962

Re: Stardot logo disappeared!

I'm seeing the Stardot logo on an ipad with Safari but the pppBB logo with Chrome under Windows 10 - I've scrubbed the computer clean of all cached data but I can't get the logo back.... :? I'm hoping to get printed Stardot tablecloths produced soon for shows (which have already been mocked up) so d...
by MartinB
Fri Feb 16, 2018 6:24 pm
Forum: stardot.org.uk
Topic: Stardot logo fixed and now spud and banana free!
Replies: 57
Views: 962

Re: Stardot logo disappeared!

Ha! Very good.... =D>

Don't get me started again though, I had more designs on the go at the time than you can shake a stick at..... :D

StarDot Invaders.jpg
StarDot Invaders.jpg (8.52 KiB) Viewed 319 times
by MartinB
Fri Feb 16, 2018 6:02 pm
Forum: stardot.org.uk
Topic: Stardot logo fixed and now spud and banana free!
Replies: 57
Views: 962

Re: Stardot logo disappeared!

Hey Daniel - if you don't like my Stardot logo, just say so, don't make excuses [-X

We can always change to my second design..... :D

The Smoking Capacitor.jpg
by MartinB
Sun Jan 28, 2018 6:31 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Probably worth my mentioning here that the UPURS transfer utilities are also available on disc so once you have the latter, you don't have to change any rom configs to get real disc images to and from a PC. Just plug in the cable, select DFS and away you go. Just sayin'.... :)
by MartinB
Sat Jan 27, 2018 8:04 am
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Thank-you Jonathan, I did realise that but I find T-Break easier to remember for tape invocation and easier to convey to others, especially since Telesoftware is obsolete and nobody has that feature anymore.
by MartinB
Sat Jan 27, 2018 7:58 am
Forum: software: other
Topic: Read Word Wise Plus files on PC
Replies: 15
Views: 464

Re: Read Word Wise Plus files on PC

You should find you can still image it directly to your PC with UPURS - just use the I, I4 or I8 switches to ignore any errors if your problems are more than just accidental deletion. (There is a disc screwed-up threshold below which UPURS won't go but hopefully you've not reached that with this dis...
by MartinB
Fri Jan 26, 2018 7:36 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Yes, that interface will work with virtually all single and double density, 40T and 80T 5.25” drives, just not with later HD-only types. An big advantage of the 177x interface over the 8271 one is that you can also use most 3.5” drives, even HD types provided you use DD discs where the latter will c...
by MartinB
Fri Jan 26, 2018 6:40 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

I think the 8271 is definitely suspect. You need to either try a replacement or try that one in another machine.
by MartinB
Fri Jan 26, 2018 5:58 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

No. Just the DFS 0.9 rom (plus OS & BASIC) and 8271 + support chips. When it hangs, <Ctrl><T><Break> and then to my most recent post.... Then, after a T-Break, can you perform... *HELP DFS and *DISC and get the prompt back? If you can, try a disc in a drive and do a *. ...I don't believe Ralf ha...
by MartinB
Fri Jan 26, 2018 4:36 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Thanks Peter - I'd still like Ralf to try my suggestions... :)
by MartinB
Fri Jan 26, 2018 3:18 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

I don't use MMC - is that first DFS 0.A3 correct? If it is an MMC DFS rom, could you remove it leaving only floppy DFS 0.9 fitted. Then, after a T-Break, can you perform... *HELP DFS and *DISC and get the prompt back? If you can, try a disc in a drive and do a *. ( Heh - " ...after a T-Break &q...
by MartinB
Mon Jan 22, 2018 1:25 pm
Forum: hardware
Topic: Files from modern PC to DFS disk....
Replies: 13
Views: 375

Re: Files from modern PC to DFS disk....

Stephen wrote:For writing an image to floppy, it's hard to beat a UPURS cable and the software Martin wrote :-)

Thank-you Stephen, cheque's in the post as arranged... :- O:)
by MartinB
Sun Jan 21, 2018 9:52 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Nice work! Presumably then, DFS 0.9 usually seems to initialise ok (on a serviceable machine) without the hardware present because the ‘open’ status register read happens to return bit 7 as a ‘not busy’ zero?
by MartinB
Sun Jan 21, 2018 9:26 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Yeah, I actually knew that (the no interaction part), I just wanted to see if he could get to a state where the DFS can be resident in the machine passively so that we could then see if it correctly responds to *HELP etc. Just some sanity checking steps for his DFS rom as it appears to the machine. ...
by MartinB
Sun Jan 21, 2018 8:50 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Ralf - in DFS config (no MMC rom) and whilst it’s hung after switch-on, perform a <Ctrl><T><Break> which should drop you into the prompt with the machine initialised as tape-only. This should work and then, a *HELP should correctly list DFS as one of the roms. Might just help to establish how much ‘...
by MartinB
Sun Jan 21, 2018 7:48 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Interestingly, it seems to be the ‘re-mastered’ drawings that show Pin 1 tied high but the original AUG one, (as has just been scanned and uploaded on another thread), simply doesn’t show Pin1 and therefore correctly reflects its floating reality.
by MartinB
Sun Jan 21, 2018 7:33 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Heh - you're not allowed to edit after I post, then I just look silly... :lol:

Maybe then it's Pin 1 I was thinking of even though the drawing claims otherwise... :wink:
by MartinB
Sun Jan 21, 2018 7:29 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Have you checked a Beeb or are you looking at the drawing? I don't think the former necessarily always follows the latter's good intent in this respect. However, I may also have dreamt all this.... O:)
by MartinB
Sun Jan 21, 2018 7:18 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

A normal B-Beeb "sees" only the upper half. Hmmm... I have a worry bead somewhere that says there might be a rom-socket pin left floating in a 'normal' Beeb (A14?) such that with 32K devices, it is possible to drift in and out of the halves. I'd either check on that or program a 16K devic...
by MartinB
Sun Jan 21, 2018 6:38 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

Why does that rom on the right say BASIC 2 and MMC? Is there a special MMC version for Basic 2? What are the two roms on the left - BASIC and the OS?
by MartinB
Sun Jan 21, 2018 6:28 pm
Forum: hardware
Topic: BBC Model B and DFS Problem
Replies: 75
Views: 1625

Re: BBC Model B and DFS Problem

I've done a binary check and they're both identical to the standard archive images.
by MartinB
Fri Jan 19, 2018 8:30 pm
Forum: hardware
Topic: Problem BBC Model B and Turbo MMC
Replies: 30
Views: 784

Re: Problem BBC Model B and Turbo MMC

Worth checking that none of the keyboard links are set (bottom right of keyboard) in case it’s trying to auto-boot.
by MartinB
Sat Jan 13, 2018 5:33 pm
Forum: hardware
Topic: Floppy drive ready line.....
Replies: 2
Views: 141

Re: Floppy drive ready line.....

I've always understood FDD READY to simply mean that correct power is present, a disc is inserted and that the spindle is up to speed - typically with a threshold of around 90% of full speed. Thus, I wouldn't expect stepping to affect it. Some drives do have jumpers to configure the conditions for R...
by MartinB
Fri Jan 12, 2018 4:41 pm
Forum: hardware
Topic: Recurrent corrupted discs - possible floppy drive fault?
Replies: 17
Views: 448

Re: Recurrent corrupted discs - possible floppy drive fault?

One of the advantages of using UPURS for DFS disc writing (doesn't do ADFS [-X ) is that all the writing is done on the Beeb (or Elk or Master) and you therefore never get strange incompatibility issues with drives and discs.
by MartinB
Wed Jan 10, 2018 11:28 pm
Forum: hardware
Topic: Plus1 Cart slot enables?
Replies: 4
Views: 208

Re: Plus1 Cart slot enables?

On my Fisher Price EUP, the on-board rom/ram slot is configured to accept a 16k or a 32k chip and in the case of the latter, ROMQA is simply connected directly to A14 of the device to give two 16k roms.