Search found 1426 matches

by RobC
Mon May 29, 2017 5:55 pm
Forum: other vintage computer hardware, software and games
Topic: Tatung Einstein TC-01 with TM-01 colour monitor fault
Replies: 6
Views: 53

Re: Tatung Einstein TC-01 with TM-01 colour monitor fault

Funnily enough, I've just been watching a video on YouTube where Tom from Ident Computers fixes a Cub that refuses to display red.

Might give you some pointers?: https://www.youtube.com/watch?v=bbTpmzyy_64

(Usual warning about messing about with monitors applies!)
by RobC
Mon May 29, 2017 5:51 pm
Forum: hardware
Topic: Master 512 Bot From DataCentre CF Drive - Help!
Replies: 5
Views: 112

Re: Master 512 Bot From DataCentre CF Drive - Help!

Glad you got it working.
by RobC
Mon May 29, 2017 12:05 pm
Forum: hardware
Topic: Master Series Issue
Replies: 13
Views: 136

Re: Master Series Issue

The CMOS RAM needs to be reset and it's likely that the internal batteries need to be replaced. Hold down R as you turn on the power to reset it.

See http://lionels.orpheusweb.co.uk/CompNyb/TechStuff/8-Bit/Master128/128BatConfig.html for more details.
by RobC
Mon May 29, 2017 10:36 am
Forum: hardware
Topic: Master 512 Bot From DataCentre CF Drive - Help!
Replies: 5
Views: 112

Re: Master 512 Bot From DataCentre CF Drive - Help!

Have you guys got ADFS Explorer?

If so, I have a working CF installation on my DC and can mail you the files off my card which you can then add to yours.
by RobC
Mon May 29, 2017 9:49 am
Forum: software: games
Topic: A new version of Phoenix for the BBC
Replies: 63
Views: 4956

Re: A new version of Phoenix for the BBC

This is awesome - I can't believe it looks so good on a Beeb!
by RobC
Mon May 29, 2017 8:48 am
Forum: other vintage computer hardware, software and games
Topic: Tatung Einstein TC-01 with TM-01 colour monitor fault
Replies: 6
Views: 53

Re: Tatung Einstein TC-01 with TM-01 colour monitor fault

I would definitely test out the monitor with a different source. When I had a similar problem with my Einstein 256, the problem turned out to be a faulty transistor in the Einstein's video circuit.
by RobC
Sun May 28, 2017 7:51 am
Forum: hardware
Topic: A4 Laptop No Display
Replies: 34
Views: 902

Re: A4 Laptop No Display

Glad you've made some progress. The slowing down/freezing is a very common problem - it seems like something is causing sporadic spurious interrupts that either slow the machine down or cause it to freeze completely. I fixed this problem on mine by replacing the electrolytic capacitors on the PCB, g...
by RobC
Sat May 27, 2017 10:59 am
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 78
Views: 3387

Re: Baildon Electronics IDE Interfaces - Replication

I've also managed to find my Balidon IDE interface - it's the Risc PC/podule type rather than the mini-podule one.

I can buzz out the connections against the schematic over the next week and look at scoping the pins.
by RobC
Fri May 26, 2017 1:48 pm
Forum: hardware
Topic: Microdigital Omega
Replies: 20
Views: 802

Re: Microdigital Omega

Zarchos wrote:Charlie is on Amibay and he's not in a hurry to come back to *. ... strange and disappointing.

That is a pity. Do you have contact details for him? I'd like to pick his brains about USB on the Omega...
by RobC
Thu May 25, 2017 6:43 pm
Forum: hardware
Topic: Microdigital Omega
Replies: 20
Views: 802

Re: Microdigital Omega

Finally got round to getting more memory for my Omega. I managed to find an identical 256MB SIMM and have fitted it - the Omega boots happily but RISC OS still only reports 256MB. However, the Omega !Memsize application correctly reports that 512MB has been fitted. Does anyone have experience of run...
by RobC
Wed May 24, 2017 12:18 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 240
Views: 7352

Re: Palettemate / enhanced video ULA with 4096 colours

Hi Dominic, I'm using the same paste (based on your earlier recommendation!) and am slowly getting better at it. The last board I made is certainly a lot better than the first... When you say the finest nozzle is that the one with the "metal tube" end or the conical plastic one? Also, how ...
by RobC
Tue May 23, 2017 6:42 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 240
Views: 7352

Re: Palettemate / enhanced video ULA with 4096 colours

The best thing you can do is use LOTS of liquid flux if you're hand soldering. Solder paste can also be good to use if you have a sane way of applying it. Yup use lots of flux. If the soldering iron tip temperature is too low or unstable ( with thermal load) then shorts are common. A bigger tip can...
by RobC
Tue May 23, 2017 5:23 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 240
Views: 7352

Re: Palettemate / enhanced video ULA with 4096 colours

That sounds dangerous, if it fits in all my machines with expansions I am going to have to several of them Nula's :) And then above you promised the Electron version with mode 7 :^o Think I'll need a rest before I tackle that! Well done Rob! Was the soldering as difficult (or more difficult!) as yo...
by RobC
Tue May 23, 2017 3:48 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 240
Views: 7352

Re: Palettemate / enhanced video ULA with 4096 colours

Just trying to judge from the picture what boards it would play nicely with. It wouldnt fit in my main Master unless I removed the internal copro, and it wouldnt fit in my main Beeb with its sidewise ramboard. Would fit in my secondary Beeb though which is empty. It's very low profile so should fit...
by RobC
Tue May 23, 2017 7:58 am
Forum: for sale / freebies
Topic: New TEAC floppy drives
Replies: 30
Views: 509

Re: New TEAC floppy drives

I'd be interested - what sort of price would we be looking at?
by RobC
Mon May 22, 2017 9:13 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 240
Views: 7352

Re: Palettemate / enhanced video ULA with 4096 colours

Finally received the last lot of components today and so I spent a few hours building a board. The CPLD was a real pain to solder - I definitely need to practise more! The good news is that it worked first time despite my ham-fisted soldering :D I'll do some more testing in various machines tomorrow...
by RobC
Fri May 19, 2017 5:57 pm
Forum: for sale / freebies
Topic: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 581
Views: 37441

Re: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro

It would seem not but you do get the following: Current Status The PiTubeDirect firmware currently includes emulations of the following Beeb Co Processors: 65C102 (using 65tube - the fastest known native ARM 65C02 emulation) 65C102 (using lib6502 - written in C) 80x86 (using Fake86 - written in C) ...
by RobC
Wed May 17, 2017 5:28 pm
Forum: wanted
Topic: Wanted - A3000 IDE podule
Replies: 34
Views: 482

Re: Wanted - A3000 IDE podule

trixster wrote:One of these?

https://www.ebay.co.uk/itm/221077308288

Yes - that exact one.
by RobC
Wed May 17, 2017 2:16 pm
Forum: projects
Topic: Starting a Prince of Persia port...
Replies: 20
Views: 695

Re: Starting a Prince of Persia port...

I presume your NuLA can program the palette in MODE 1 as well? So even if it was four colours we could at least get an accurate Apple II blue & orange? :D Yes - the colours in any mode (including mode 7) can be chosen from the 4096 colour palette. The big advantage in mode 2 is that you get 16 ...
by RobC
Tue May 16, 2017 9:23 pm
Forum: wanted
Topic: Wanted - A3000 IDE podule
Replies: 34
Views: 482

Re: Wanted - A3000 IDE podule

Could you *. members confirm the castle IDE minipodule is the best suited for Trixster because it uses the Acorn ADFS 'system', thus Trixster could decide to simply remove the card he's got in his A3020, connect it to the Castle board, and it would work a treat. (I know it's not what he intended to...
by RobC
Tue May 16, 2017 4:18 pm
Forum: projects
Topic: Starting a Prince of Persia port...
Replies: 20
Views: 695

Re: Starting a Prince of Persia port...

Really excited that this is happening - I'd looked at it briefly but decided that I didn't have the skills. Any version would be great but something in mode 2 using my VideoNuLA would be fantastic (but I'm obviously biased :D) In terms of memory, I wouldn't be put off even if it needs SWRAM and ROM....
by RobC
Sun May 14, 2017 4:29 pm
Forum: hardware
Topic: A4 Laptop No Display
Replies: 34
Views: 902

Re: A4 Laptop No Display

Looks like it had been replaced at some point in the past. However, that's no guarantee that it's still working of course.

It would be worth replacing the battery (I use a rechargeable 'AAA' in a holder) and also checking the CMOS RAM circuit with a meter.
by RobC
Thu May 11, 2017 10:12 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 240
Views: 7352

Re: Palettemate / enhanced video ULA with 4096 colours

The only thing I thought of was something slightly inspired by the Oric video display. It had bytes of 6 pixels, with two bits reserved for special effects. One of those bits marked the byte as an attribute (which, like Teletext, appeared as a blank cell and operated on the remainder of the line, s...
by RobC
Thu May 11, 2017 5:57 pm
Forum: hardware
Topic: Archimedes A540 : which speed for the CPU ?
Replies: 13
Views: 210

Re: Archimedes A540 : which speed for the CPU ?

dp11 wrote:My old ceramic ARM3 happily overclocked to 40+MHz

Yes - my A540 has been running with one of those for years at 43MHz. With a ColourCard and memory running at ~16MHz, it's faster than my original RiscPC 700!
by RobC
Thu May 11, 2017 4:57 pm
Forum: hardware
Topic: Archimedes A540 : which speed for the CPU ?
Replies: 13
Views: 210

Re: Archimedes A540 : which speed for the CPU ?

Just opened up my R260 - it has a 50MHz oscillator (so running at 25MHz not 26), Arm3 VY86C020-PSFC and an FPA10. I think this is where my memory that the CPU speed was limited by the FPA came from. The original CPU card for this machine was a PGA type with 52MHz oscillator before it was upgraded to...
by RobC
Thu May 11, 2017 3:07 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 240
Views: 7352

Re: Palettemate / enhanced video ULA with 4096 colours

I honestly think that, for sprites, you're going to need to take a whole different approach: essentially replacing both the 6845 and VIDPROC with an all-in-one bit of logic including some on-board RAM (the same as the Amstrad CPC+). But that starts to stray quite significantly from the regular BBC ...
by RobC
Thu May 11, 2017 1:40 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 240
Views: 7352

Re: Palettemate / enhanced video ULA with 4096 colours

Thanks tricky - that clarifies things. There's probably only enough room left to store 4 (or possibly 5) bytes so having all the attributes at the start of the line won't work. It would be possible to read the next attribute byte before every 16 pixels though. Agree that a bigger device (FPGA) would...
by RobC
Thu May 11, 2017 12:41 pm
Forum: hardware
Topic: Archimedes A540 : which speed for the CPU ?
Replies: 13
Views: 210

Re: Archimedes A540 : which speed for the CPU ?

Hmm. For a 30MHz machine, run from a 60MHz crystal, I can see how memory could be clocked at 12MHz - it's 60/5. But for a 25MHz machine to clock memory at 12MHz... might it really be 12.5MHz? (That is, I'm expecting clocks to be locked to one master clock, not independent. But I don't know anything...
by RobC
Thu May 11, 2017 6:20 am
Forum: hardware
Topic: Burning a RISC OS 2.01 EPROM
Replies: 7
Views: 143

Re: Burning a RISC OS 2.01 EPROM

I'm pretty sure that I have at least one set of 2.01 ROMs as I upgraded my A540 and my R260 to RO3.
by RobC
Wed May 10, 2017 8:40 pm
Forum: hardware
Topic: Burning a RISC OS 2.01 EPROM
Replies: 7
Views: 143

Re: Burning a RISC OS 2.01 EPROM

If it doesn't work, let me know and I'll dig out some RISC OS 2 ROMs that you can have...

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