Search found 414 matches

by Boydie
Wed Mar 18, 2020 2:22 pm
Forum: for sale / freebies
Topic: FS: Raspberry Pi to 1MHz bus interface
Replies: 26
Views: 988

Re: FS: Raspberry Pi to 1MHz bus interface

Please can I clarify my interest - 1 each of the underside 1MHz and Tube, and 1 remote 1MHz (so same overall total as before).
by Boydie
Wed Mar 18, 2020 10:42 am
Forum: general
Topic: BCPL Keystrip
Replies: 9
Views: 306

Re: BCPL Keystrip

As good as I can get it...
by Boydie
Wed Mar 18, 2020 8:13 am
Forum: off-topic
Topic: Isolating myself - for three months !!!!!!!!!!!
Replies: 33
Views: 1411

Re: Isolating myself - for three months !!!!!!!!!!!

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...
by Boydie
Mon Mar 16, 2020 10:23 pm
Forum: general
Topic: BCPL Keystrip
Replies: 9
Views: 306

Re: BCPL Keystrip

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...
by Boydie
Tue Mar 10, 2020 6:31 pm
Forum: hardware
Topic: RISC PC Disappearing Memory
Replies: 16
Views: 848

Re: RISC PC Disappearing Memory

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...
by Boydie
Tue Mar 03, 2020 4:29 pm
Forum: hardware
Topic: Finding my old school equipment (Sheffield)
Replies: 8
Views: 417

Re: Finding my old school equipment (Sheffield)

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...
by Boydie
Mon Mar 02, 2020 9:51 am
Forum: hardware
Topic: New SCSI Host Adaptor
Replies: 38
Views: 879

Re: New SCSI Host Adaptor

Plus one for me
by Boydie
Fri Feb 28, 2020 10:13 pm
Forum: hardware
Topic: A680s
Replies: 23
Views: 2841

Re: A680s

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...
by Boydie
Fri Feb 28, 2020 1:51 pm
Forum: hardware
Topic: A3000 repair -- keyboard connectors
Replies: 9
Views: 377

Re: A3000 repair -- keyboard connectors

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.
by Boydie
Fri Feb 28, 2020 1:26 pm
Forum: hardware
Topic: A3000 repair -- keyboard connectors
Replies: 9
Views: 377

Re: A3000 repair -- keyboard connectors

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...
by Boydie
Fri Feb 28, 2020 12:20 pm
Forum: hardware
Topic: A3000 repair -- keyboard connectors
Replies: 9
Views: 377

Re: A3000 repair -- keyboard connectors

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

Worked fine in my A3000
by Boydie
Thu Feb 27, 2020 10:43 am
Forum: hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 619

Re: Acorn AKA20 We32206 Floating Point Co-Processor

Thanks for the explanation. You’ve just saved me from a couple of hours of futility. =D>
by Boydie
Thu Feb 27, 2020 9:34 am
Forum: hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 619

Re: Acorn AKA20 We32206 Floating Point Co-Processor

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...
by Boydie
Wed Feb 26, 2020 9:50 pm
Forum: archive submissions
Topic: Floating Point Podule
Replies: 0
Views: 204

Floating Point Podule

Software disc and manual (scanned to my usual low standards!) for the original FP Co-Processor Podule
by Boydie
Wed Feb 26, 2020 3:26 pm
Forum: hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 619

Re: Acorn AKA20 We32206 Floating Point Co-Processor

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...
by Boydie
Wed Feb 26, 2020 1:06 pm
Forum: hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 619

Re: Acorn AKA20 We32206 Floating Point Co-Processor

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...
by Boydie
Wed Feb 26, 2020 12:52 pm
Forum: hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 619

Re: Acorn AKA20 We32206 Floating Point Co-Processor

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.
by Boydie
Wed Feb 26, 2020 7:28 am
Forum: hardware
Topic: Acorn AKA20 We32206 Floating Point Co-Processor
Replies: 25
Views: 619

Re: Acorn AKA20 We32206 Floating Point Co-Processor

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...
by Boydie
Tue Feb 18, 2020 7:53 pm
Forum: hardware
Topic: Bizarre A4 keyboard issue
Replies: 0
Views: 134

Bizarre A4 keyboard issue

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...
by Boydie
Fri Feb 07, 2020 6:54 pm
Forum: acorn atom and system
Topic: AcornDOS System version.
Replies: 8
Views: 982

Re: AcornDOS System version.

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).
by Boydie
Wed Feb 05, 2020 1:17 pm
Forum: acorn atom and system
Topic: Atom Tube Interface
Replies: 244
Views: 21819

Re: Atom Tube Interface

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...
by Boydie
Wed Feb 05, 2020 10:58 am
Forum: acorn atom and system
Topic: Atom Tube Interface
Replies: 244
Views: 21819

Re: Atom Tube Interface

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? :(
by Boydie
Wed Feb 05, 2020 10:35 am
Forum: acorn atom and system
Topic: Atom Tube Interface
Replies: 244
Views: 21819

Re: Atom Tube Interface

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"
by Boydie
Tue Feb 04, 2020 8:38 pm
Forum: acorn atom and system
Topic: Atom Tube Interface
Replies: 244
Views: 21819

Re: Atom Tube Interface

02A89149-AF86-4513-B7BB-4150687ED2A0.jpeg
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!
by Boydie
Tue Feb 04, 2020 8:05 pm
Forum: acorn atom and system
Topic: Atom Tube Interface
Replies: 244
Views: 21819

Re: Atom Tube Interface

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.
1AAADA6E-B572-45C4-8488-BBC94E17F1C0.jpeg
Edit: Sorry for the upside-down picture. ^%&*&*&* iPhones!
by Boydie
Tue Feb 04, 2020 7:24 pm
Forum: acorn atom and system
Topic: Atom Tube Interface
Replies: 244
Views: 21819

Re: Atom Tube Interface

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 ...
by Boydie
Tue Feb 04, 2020 6:50 pm
Forum: acorn atom and system
Topic: Atom Tube Interface
Replies: 244
Views: 21819

Re: Atom Tube Interface

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>...
by Boydie
Sun Feb 02, 2020 9:12 am
Forum: hardware
Topic: MMFS Development and Support
Replies: 978
Views: 74939

Re: MMFS Development and Support

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...
by Boydie
Thu Jan 30, 2020 10:58 am
Forum: archive submissions
Topic: Cumana Touchpad "Manual"
Replies: 1
Views: 256

Cumana Touchpad "Manual"

The original instructions that came with a Cumana Touchpad. To call them brief understates it somewhat!
by Boydie
Thu Jan 30, 2020 8:41 am
Forum: general
Topic: Today I received.....
Replies: 5707
Views: 491585

Re: Today I received.....

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...