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I have one identical to that in my A5000 :) It's provides an additional 2mb to the A5000, bringing it up to 4mb, the extra tracking would provide a further 4mb and dual MEMC sockets - and would plug into the MEMC socket on the A5000's pcb. From my own investigations a few years back, I was confident...

Well done on identifying IC42, I've had to replace this on a battery damaged A5000 in the past too. Other two ICs I've had problems with are the buffers for the IDE HDD data lines, so keep an eye on these if you HDD doesn't function in future. For the HDD LED, there's a track which runs across the w...

Here's my issue 2 model A, Cleartone manufactured, serial 100403 and all chips socketted which is very nice :) It's in great condition, so I don't want to modify (other than easily reversible) but it is rather limited without any ports...! I'm currently working up a reliable and reversible fitment ...

All depends on time/effort you are willing to put into repairs and if you are treating it as a hobby/learning exercise. With Commodore people, it seems to be when the board tracks have utterly perished. That's probably my personal limit as well. I'm game for repairing a small number of traces, but i...

This is brilliant, many thanks for sharing your work Ian!

Also I suspect this thread will be very useful to others who are wanting to backup old HDDs onto SD cards, but it has strayed off topic from the original title "Formatting SD/CF cards for use on RISC OS 3.1" - so I wonder if one of the forum mods could maybe move the backing up HDD topics into a thr...

Well done, what an excellent result to have safely backed up your HDD! =D> I tried running every single application from my hard drive on my Pi and only one program ran, and then crashed :( Pi is definitely not a solution for running programs, at least in my case. Almost everything complained about ...

Here's my issue 2 model A, Cleartone manufactured, serial 100403 and all chips socketted which is very nice :) It's in great condition, so I don't want to modify (other than easily reversible) but it is rather limited without any ports...! I'm currently working up a reliable and reversible fitment o...

I'm assuming the circuit itself is pretty similar, if not identical, given that it runs normal Beeb software...(at least I'm hoping it will, when it is working!?). I know for a fact the ROMSEL circuitry is different to a regular beeb as I found when repairing my German Beeb (same as a US Beeb). I w...

Oh, I'd be interested in the C64 if still available?

Will PM you.

Interesting, just noticed the green padlock myself. Most pages seem to have it, but a few such as Page 154 of "Today I recieved" don't have the padlock, although page 153 does...

I picked up a couple of empty Master 128 cases last year. Both are very yellowed. One of them has obviously had something with a straight edge put on top such that half the case is yellow and the other cream. I suspect that such a two-tone case will not respond well to RetroBrite treatment, even mu...

I've just tried the latest version and it is truly amazing work! I remember waiting with eager anticipation for 20+ minutes for one of these to draw back in the day. One recommendation - can you clear the keyboard buffer at the end of a frame? The current version (well the one at the top of the thre...

Also, does anyone know of any fault-finding information for the US Beeb? The PCB layout is completely different, along with the IC numbering and link numbers, and very few chips are socketed - similar to issue 7 beebs. So if there's a list somewhere of US Beeb IC numbers or link numbers, that would ...

Might it have had its ULA swapped at some time? Does it even have/need the invention mod? Good question. Fitted a ULA to get it running. No idea if it has or needs the mod - pcb is a different layout which might make it difficult to tell, and dates from 1983, if that helps? What do I need to look f...

So first thing I did, was to switch on without a monitor connected, as I didn't have one nearby at the time... And Brrrrrr-BEEEP! :D :D :D It works! =D> ...or at least it worked ...briefly...! Plugging a monitor in revealed the following: 20180529_100817.jpg Not bad I guess for the first time powere...

After fitting the American Beeb PSU, and a quick loan from my working issue 7 beeb - we have all the missing ICs and a source of power :D I couldn't find a really clear picture of an American Beeb online (at least not one where I could easily read the IC numbers!), so hopefully this will fill the ga...

As you can see from the photo at the top of the thread, the insides of this US Beeb were a little nasty, having been used as a mouse-toilet for several years! I cleaned the PCB up back in 2016, with a nice soak in hot soapy water and a good scrub, but forgot to post the result, so here it is: 201805...

Well fast-forward almost two years, and I now have one of these: viewtopic.php?f=41&t=5594&p=203516#p203516

...so time to resurrect this resurrection thread

First a comparison between the American Beeb PSU (left) and the UK Beeb PSU (right):

MANDEL was included in ARM BASIC 1.00 (assembled 14th April 1986) It was not included in the next version I can find: ARM BASIC 1.02 (25th September 1987). Just out of interest, I powered up my Arthur 0.3 A310 today and had a look for the MANDEL keyword in it's ARM BASIC v1.00, but it's not present...

Thanks to Retroclinic, yesterday I received this rather unusual beast: So hopefully I can finally fix this.

This was the last IDE board I've got, hope everyone out there with one of them managed to get it working :?: Great to see you've got it into your expanded Adelaide A3010, what a machine that must be! Interesting to see also because you have a very low lying Adelaide board, mine is on much higher le...

Have you checked that the 128mb cards are real and not those fake capacity ones that lurk on places like Ebay and Alibaba? Great thought, and useful tools thanks, but i don't think anyone is trying to fake a 128mb ( not gb) card. If anything this would be a larger capacity card cut down to 128mb as...

hoglet wrote:There is a debug build of MMFS that (U/MMFSDBG.rom) that logs the SPI commands sent to the card, and the responses.

Thanks Dave - just tried this, and upon issuing *CARD, I get about 40 rows of "FF400000000095:FF" before it returns the "Card?" error...

Guess that means no SPI?

DutchAcorn wrote:Did you use the SD card formatter to format them? Modern versions of windows are known to have issues with formatting SD cards?

Yep, that's what I used...

Not sure how to get more information off the card though, is there a tool to extract information?

Thanks duikkie, very useful summary.

duikkie wrote:which cards , brand and other marks ?

I only have what is in the photo, no brand or other marks.

So this would be SD only then, no SPI, that's a shame.

Hopefully not the start of a new trend in SD only cards...

Is it normal to find that some SD cards don't work with any of the MMFS/SmartSPI/etc. ROMs using a 99p user port interface on the beeb? I recently got a couple of brand new, but very low capacity, SD cards (128mb) bundled with parts for another project. I was going to stick them in the back of my sp...

My issue 3 beeb has a SN76489AN, however my issue 2 beeb has a SN76489N. I'm very surprised and confused by this info as everything I've read suggests that the SN76489 max clock is 500Khz, (whereas SN76489A is 4Mhz max) so unless the issue 2 MB has a /8 compensation for the 4Mhz sysem clock, it see...

Great discussion, I hadn't appreciated the different possibilities to output sampled sound from the beeb! The SN76489AN used in most (all?) BBCs does indeed reset the bit sequence when writing to the noise control register. I know the NCR 8496 does not (this is required by the LucasArts Tandy music ...