Search found 1691 matches

by steve3000
Thu Aug 03, 2017 10:59 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

Good news everyone! It seems you were spot on steve3000 ... the oscillator circuit was dead (one of the flip flops of the 74ACT74 was bad). Exchanged the 74ACT74 with a new one (and socketed and replaced the oscillator in the same go) and boom - RISC OS 3 is working with the ARM3 upgrade. Great new...
by steve3000
Thu Aug 03, 2017 2:17 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

Just to summarize: ARM3 + RISC OS 2.01 works, gives an error on boot "Branch through zero at &03811F1C (Error number &80000005)" and needs manual starting of the Desktop, seems to work fine otherwise - however when unplugging the ARM3Support ROM module the computer boots through t...
by steve3000
Thu Aug 03, 2017 1:58 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1140

Re: ColourCard (Gold) on the Archimedes

Hi Rob, thanks for the offer - next time you're running your A540, please do post up the CCmonitortype, CCsyncs, etc. settings you're using. :) Also, have you been able to get the pass-through modes working OK? I'll post up my settings at the weekend when I'm back home, but it did take a lot of play...
by steve3000
Wed Aug 02, 2017 8:26 am
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1140

ColourCard (Gold) on the Archimedes

Does anyone have experience of using a ColourCard/ColourCard Gold? I've been experimenting trying to get my newly acquired ColourCard Gold to work on my A5000, but am struggling. It seems most of the pre-defined new screen MODEs are either of non-standard shapes or refresh rates and so are immediate...
by steve3000
Wed Aug 02, 2017 8:11 am
Forum: general
Topic: Today I received.....
Replies: 4217
Views: 224945

Re: Today I received.....

A ColourCard Gold... :D

DSC_4175.JPG

I'm struggling to get it to work correctly with my LCD monitor however, but will post a separate thread about this.
by steve3000
Tue Aug 01, 2017 10:04 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

Just a thought but did the A3000 ever ship with MEMC1? That wasn't compatible with the ARM3 iirc. I don't think they did...but even if they had done, I recall reading the problem with MEMC1 and ARM3 was that it effectively forced cache cycles to the same timing as bus cycles, so it should work with...
by steve3000
Tue Aug 01, 2017 9:32 pm
Forum: hardware
Topic: Solidisk 2/4Meg 256k card issue
Replies: 17
Views: 599

Re: Solidisk 2/4Meg 256k card issue

I'm 'assuming' the processor is 4MHz... Its a CMOS one and it was on the board... I'll confirm the processor tonight. Your picture shows the same 4mhz 6502 as I have on my board, so that should be OK :) As Rob says, definitely check/resolder flying leads - I did this on my board too, but mainly bec...
by steve3000
Tue Aug 01, 2017 9:26 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

Del is probably better. It resets evrything. http://www.riscos.com/support/developers/riscos6/startup/resettypes.html (I'm prettry sure the R/Del difference also applies to earlier RISC OS versions). Good point, power on+Del works under RO2, you may have a bit more *configure-ing to do after though...
by steve3000
Tue Aug 01, 2017 9:23 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

my ROMs are 150ns, that should be borderline within the limits for the 10MHz bus, right 8mhz on the A3000, so you're fine. :) EDIT3: Apparently the machine has a keyboard issue related to the connector ... I'll get into that at a later point. Would resetting the CMOS give me any kind of feedback Qu...
by steve3000
Tue Aug 01, 2017 9:09 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

Major success! Unplugging the ROM module "ARM3Support" (previously dormant) which was somehow previously installed the machine now boots through to the desktop when using the ARM3 upgrade together with RISC OS 2.01. Going back to RISC OS 3 (very likely 3.11) the problem remains as it was ...
by steve3000
Tue Aug 01, 2017 7:14 am
Forum: hardware
Topic: Solidisk 2/4Meg 256k card issue
Replies: 17
Views: 599

Re: Solidisk 2/4Meg 256k card issue

How strange that you see artefacts at 2mhz only with the 4mhz feed connected... It sounds like a RAM issue, but the computer runs ok and stable at 2mhz without the 4mhz feed connected? Other thoughts, have you tried taking the 4mhz feed from anywhere else? And when it boots at 2mhz, with the 4mhz co...
by steve3000
Tue Aug 01, 2017 6:33 am
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

That's good to know because the ROMs I found apparently are split "flat" rather than in a bytewise fashion (or at least I'm getting plain ASCII text still recognizeable - even tho they're supposedly dumped directly from ROMs and named according the the IC footprint they're supposed to go ...
by steve3000
Tue Aug 01, 2017 12:03 am
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

I found a 4x128K image for RISC OS 2.00 ... would I have to change any of the ROM related jumper links when using 29F010 for ROMs? I've not used these before, you'll need to confirm with the circuit diagram. I've used 4 x 27c801's successfully in the past to burn RO3 (4x512kb images) and just doubl...
by steve3000
Mon Jul 31, 2017 11:01 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

I had tried the LK28 procedure earlier - results were just as you mentioned. No video, floppy blinking. About letting the computer run for a bit, I tried that ... it either does a delayed reset if I pressed the button earlier ... or just sits there (waited up to 5 minutes - after that it would inst...
by steve3000
Sun Jul 30, 2017 5:00 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2457
Views: 168046

Re: Worth Taking a Look At

Acorn A500 prototype (a snip at a mere £1500): http://www.ebay.co.uk/itm/Working-Acorn-A500-prototype-archimedes-LOFT-FIND-/122622471946?hash=item1c8cde6f0a:g:wwIAAOSw6KVZfQwQ Interesting, but that's a lot to pay for a computer which can't run much other than it's own version of Arthur. It'd be nic...
by steve3000
Sun Jul 30, 2017 4:52 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

What happens if you leave the computer on for 30-60 seconds? If it has failed power on self test, then depending on the error, it may proceed to boot after a delay (delay is due to flashing codes out on the floppy drive). Also just check the floppy drive is plugged in - have you seen any self-test f...
by steve3000
Sun Jul 30, 2017 10:42 am
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

Couple of questions, have you removed every expansion, to get back to the base 1mb RO3 system (just in case of a secondary issue with hdd or RAM which wasn't evident with ARM2)? And are you switching on holding R, to reset CMOS? (this is needed the first time after upgrade, to ensure the cache-on fl...
by steve3000
Sat Jul 29, 2017 9:47 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 783

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

Hi, Welcome to the forum! Great to see someone doing this modification. Could the problem you've experienced be the same ALE issue paulv had when installing ARM3 to an A3010? Full details are documented in his forum post here: http://stardot.org.uk/forums/viewtopic.php?f=16&t=6833 Also see his d...
by steve3000
Thu Jul 27, 2017 8:52 pm
Forum: emulators
Topic: ArcEm on Pi - "Rom High..." error
Replies: 6
Views: 416

Re: ArcEm on Pi - "Rom High..." error

Hi,
Welcome to the forum!

Are your ROM images correct?

Each ROM should be exactly 512kb = 524288 bytes

Total should come to exactly 2097152 bytes... So the size you've got doesn't seem right?
by steve3000
Sat Jul 22, 2017 10:16 pm
Forum: software
Topic: How do I get !boot to auto load?
Replies: 6
Views: 294

Re: How do I get !boot to auto load?

You need to configure your drive to a number, just like with *Drive on the beeb. If the partition was the first one formatted, then it's probably Drive 4. Easiest way to test. Type: *IDEFS *DRIVE 4 *. If that doesn't list the correct contents, try drives 5, 6 and 7. Also you'll need to configure the...
by steve3000
Sat Jul 22, 2017 10:06 pm
Forum: hardware
Topic: Which A3010 Monitor?
Replies: 19
Views: 745

Re: Which A3010 Monitor?

Yep. It is just as you say. MODE 12 stops working when monitor type is configured to 1. :( That is the problem - if you have SCART connection you'll find that the 15khz modes (0-15) will work ok through this, but then you'll also find the high resolution modes 27 / 31 etc. don't work through SCART....
by steve3000
Fri Jul 21, 2017 11:41 pm
Forum: projects
Topic: Experiments in Linear Screen Modes
Replies: 2
Views: 245

Re: Experiments in Linear Screen Modes

:shock: Wow! I never thought I'd be able to sit back and watch colour digitised video on the beeb! =D>

How many discs for the whole film? :mrgreen:
by steve3000
Fri Jul 21, 2017 11:29 pm
Forum: hardware
Topic: Which A3010 Monitor?
Replies: 19
Views: 745

Re: Which A3010 Monitor?

I have an old Toshiba 23" wide screen TV, model 17MB16-P2 which seems to work OK with my A4000 as is. I set it up today just to check it out. Without using any modules such as LCDGamesMode it can resolve MODE0 through to MODE31, which is my working desktop resolution. :D The basic Archimedes M...
by steve3000
Thu Jul 20, 2017 6:19 am
Forum: hardware
Topic: Which A3010 Monitor?
Replies: 19
Views: 745

Re: Which A3010 Monitor?

An alternative to the BenQ is to use an LCD TV which accepts SCART input. I wanted a wide-screen LCD monitor which doubles up as a TV and could accept 1920x1080 VGA signal via 15-pin VGA socket from my laptop and hdmi for my Raspberry Pi. I couldn't find any brand new TV monitors which have 15 pin V...
by steve3000
Tue Jul 18, 2017 8:43 pm
Forum: general
Topic: Archimedes 30th birthday?
Replies: 12
Views: 583

Re: Archimedes 30th birthday?

SteveBagley wrote:Thanks for the tip-off -- hope we did it justice!

https://www.youtube.com/watch?v=rh7kpkwXnwA

Steve

Absolutely spot on! Great video. =D>
by steve3000
Tue Jul 18, 2017 8:42 pm
Forum: projects
Topic: Experiments in Stable Raster Timing
Replies: 14
Views: 868

Re: Experiments in Stable Raster Timing

This is awesome Kieran!

Loving those Kefrens bars - I'm going to have to post my surprisingly closely-related efforts soon :) (...but don't worry, this time it's on the Archi!)
by steve3000
Tue Jul 18, 2017 8:38 pm
Forum: general
Topic: Retrobrite streaking
Replies: 6
Views: 394

Re: Retrobrite streaking

I find the wrapping a bit difficult - clingfilm isn't the easiest stuff to use when you're wrapping something that large. I have a suitable transparent plastic box in the shed I can use, once it's been cleaned up. I've never used cling film or bags when I've retrobrighted cases in the past - so far...
by steve3000
Mon Jul 17, 2017 6:29 am
Forum: general
Topic: Archimedes 30th birthday?
Replies: 12
Views: 583

Re: Archimedes 30th birthday?

What's the difference between the 3-series and the 4-series? Different pcb. 4x0 series had ST506 interface onboard (and A440 came with a hdd), high res mono output hardware (1152x896) with two bnc connectors for output, built-in 4 slot backplane and either 4mb fitted (A440) or sockets for up to 4mb...
by steve3000
Thu Jul 13, 2017 8:06 pm
Forum: general
Topic: Archimedes 30th birthday?
Replies: 12
Views: 583

Re: Archimedes 30th birthday?

Did anyone ever see an original A410 or was it dropped from the initial line-up? The only place I've ever seen an A410 (not an A410/1) is in this video from 1987, at 3m53s. Ok, you can't actually read the label because it's too out of focus, but given the situation, I can't imagine it said anything...
by steve3000
Thu Jul 13, 2017 6:27 am
Forum: general
Topic: Archimedes 30th birthday?
Replies: 12
Views: 583

Re: Archimedes 30th birthday?

According to Archimedes wkii, the first models were initially released in June 1987, as the 300 and 400 series. However, four other models were then released a month later with minor changes and upgrades. They were the A305, A310, A310M, A410 and A440, with the latter having 4mb RAM and a 20mb HD a...

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