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Please can I clarify my interest - 1 each of the underside 1MHz and Tube, and 1 remote 1MHz (so same overall total as before).

As good as I can get it...

Thank goodness at least some people are being sensible about all this! Dave/John - you’re being true role models. As for me, I’m going to be not so much isolated as sequestered on ICU for about the same time period (who’d have thought Director of ICU would be such a bad lifestyle choice?). I’m spend...

I’ve got one.

Will try to scan and upload on Wednesday. It’ll make a nice change from all the covid meetings. And may be the last chance I get for the next few months...

At a guess, because the machine is only findng 64Mb, all of which checks out okay? When the RPC was launched, the product literature claimed to take up to 128Mb SIMMs, with the small print to the effect “when this is available”. So it wasn’t ever tested as working with 128Mb during design, because t...

From my old school, I got: TRS80 Model III (first computer I ever touched) TRS80 Line Printer VII BBC Model A Filestore E01 & E20 Watford Adder Watford Beeb Video Digitiser Acorn teletext adapter 6502 Second Processor 2 x Music87 2 x Watford ROM boards Acoustic coupler Loads of eproms Acorn Comal Pr...

Plus one for me

An image of that disc would be phenomenally useful. The original Rodime in mine still works, but was sadly blanked before I inherited it. Whilst I do have multiple copies of 1.21c (running on several other machines), and (allegedly) a copy of A680 vmunix, I can’t get vmunix to boot successfully - al...

How many do you need - is it just one that’s bad or both?

If it’s only the one, I’ve got one left over from my repairs.

Mouser had them in uk stock when I ordered, so carriage was free as part of a bigger order). It would seem Farnell also stock them for £1.03 each (+vat & carriage), which they didn’t when I bought mine. The manufacturer’s (TE Connectivity) part number is 7-520355-0. Google throws up a few possibilit...

Available from Mouser (or were in November) - part no. 571-7-520355-0.

Worked fine in my A3000

Thanks for the explanation. You’ve just saved me from a couple of hours of futility.

Can the FPU podule not co-exist with the ARM3? I do remember with the RiscPC some software that allowed the x86 cards (assuming not the SX versions) to be used as a pseudo-FPA, but that became obsolete with the StrongARM as the overhead of getting it across the DPOB made the latency greater than ju...

Software disc and manual (scanned to my usual low standards!) for the original FP Co-Processor Podule

You don't own an A7000+? :shock: I found that for some tasks - OK, FP-heavy tasks - the A7000+ was at least as good as a StrongARM RPC of the period. Nope. The plus model never came down into what I considered an acceptable price range. The bulk of my collecting was done when the stuff was worth bo...

Looks like the support disc may be MIA. I’ll upload when I get chance. As for what can be done with it, disappointingly little in practical terms. Given that it’s a choice between the copro (and faster FP) or ARM3 (and faster everything), it’s usually a no-brainer. The only advantage is faster FP in...

Looking at the respective service manuals, the A300 specifies a 64-way connector in its parts list, the A400 a 96-way.
I thought it’d been officially nobbled in some way, if for no other reason than to polarise the budget and high-end models.

RiscIx detects and uses it automatically (at least 1.21c does). There’s a special version of the FPE module for RiscOS - I’ll dig it out if it’s not available. It only works on ARM2 A400 series machines AFAIK. Don’t think the 300 motherboard had the copro lines fitted, regardless of what backplane i...

Okay, this one has me flummoxed! My A4 keyboard has developed a very weird fault. Pressing <FN> plus cursor keys moves the pointer, <FN> plus W or E produces Menu or Adjust. the Q key produces "q" or "Q" every time. Pressing Select on the mouse works. Yet <FN> plus Q does nothing. It used to, but no...

I uploaded several rom images to the archive a year or two ago. ISTR there were different versions for different floppy drives (there was definitely a TANDOS, presumably for Tandon drives).

It's now working. I'm embarrassed to admit this, but it would seem I was having a truly bad day yesterday and miscounted IC5 as a 16-pin socket, not 14. No prizes for guessing who tried to rectify his earlier faux pas by soldering the buffer line to pin 7 of IC5. :oops: Now I've realised where pin 8...

Yup! The program works now. Unfortunately, the logic probe is stuck low on IC5 pin 8.

I presume that means I've killed the CPLD?

hoglet wrote: ↑

Tue Feb 04, 2020 9:05 pm

Do you have a scope, or a logic probe?

It's quite easy to test.

On the Atom, run:

Code: Select all

NEW
10 P=#2800
20[
30 LDA #BEE0
40 JMP #2800
50]
60 LINK #2800
RUN

You should then see the Buffer Enable signal pulsing low (for about 1 cycle in 7)

Dave

Erm. I get "Error 208 at Line 60"

I’ve tried two different level shifters. One of which works fine on my Master, with the same Pi.
The green light comes on, on the Pi.

I’m starting to get that broken CPLD feeling... Would be the one component that’ll be hard to source and I can’t program!

It’s the last YARRB Roland ever made, so I’m assuming it’s latest firmware...

Thanks for clarifying. I am using it the right way round.
Edit: Sorry for the upside-down picture. ^%&*&*&* iPhones!

Bus buffers 2,3 and 4 are fitted IC5 is removed I accidentally soldered a wire from pin 36 of the 6502 socket to pin 1 of IC5 (because I'm a cretin). This has now been rectified, but still no joy. The 6502 is labelled as R6502AP / R6502-13. It's either the Atom's original, or one from a Beeb. Can I ...

Can't get mine to work at all. :( The atom has YARRB and Noisekiller fitted, plus AtoMMC. I've just downloaded the latest version of the Atom Software Archive. I'm using a Pi Zero with level shifter (have tried several Pi's, but no difference). I'm typing: ?BFFE=6 (to select AtoMMC on YARRB) <Break>...

Does MMFS have *FORM built-in? If so, won’t it be intercepting the command before ADT, because it’s in a higher priority socket (even though it’s not the currently selected FS)? Some ROMs with commands found in others have a special (optional) prefix to make them unique and prevent interference. ADT...

The original instructions that came with a Cumana Touchpad. To call them brief understates it somewhat!

I've found a few mentions of the tablet on this forum but not much. Anyone any ideas? I’ll scan the “manual” and upload to the archive section. I’ll warn you now; you’re in for a disappointment - it’s not going to take me long to do... Edit: I’ve found the real manual online, which is rather more s...