Search found 2031 matches

by DutchAcorn
Sun Apr 21, 2019 6:34 am
Forum: hardware
Topic: Another BBC B Needs Fixing.
Replies: 9
Views: 293

Re: Another BBC B Needs Fixing.

These short memory test programs are often non-conclusive.

A mode 7 screen is a more thorough test. In your case IC64 (bit 3 in CAS0) sometimes fails, but not always.

The best check is a mode 0 screen.
by DutchAcorn
Fri Apr 19, 2019 5:48 pm
Forum: hardware
Topic: BBC B+ 64k EEPROMs and SW RAM
Replies: 17
Views: 539

Re: BBC B+ 64k EEPROMs and SW RAM

Yes, I noticed the same thing: viewtopic.php?f=3&t=9483#p166487

Unsolved mystery?
by DutchAcorn
Mon Apr 15, 2019 6:20 am
Forum: hardware
Topic: my beeb just pegged it :(
Replies: 26
Views: 650

Re: my beeb just pegged it :(

If you can post a picture of the first (mode 7) screen you get we can have a look...
by DutchAcorn
Sat Apr 13, 2019 6:15 am
Forum: hardware
Topic: BBC B+ fault
Replies: 12
Views: 220

Re: BBC B+ fault

I agree with Kazzie that this is most probably caused by a faulty IC55. Sometimes the first bit (bit 0) is high when it should be low and vice versa.

The way it behaves it could well work if you piggyback a working memory chip on it (but you can never really tell).
by DutchAcorn
Fri Apr 12, 2019 8:53 pm
Forum: hardware
Topic: BBC B+ fault
Replies: 12
Views: 220

Re: BBC B+ fault

Actually, just a photo of the first (mode 7) screen may be sufficient. Does the sound and the caps lock/shift lock toggling work with Tricky’s rom installed?
by DutchAcorn
Fri Apr 12, 2019 4:41 am
Forum: hardware
Topic: my beeb just pegged it :(
Replies: 26
Views: 650

Re: my beeb just pegged it :(

Well done! =D> For the other BBC, rather than unsoldering and replacing all the CAS0 RAM, you could find out which specific chip is faulty by either fixing up an inverter on the S25 so that CAS0 and CAS1 are swapped around or burn Tricky’s test rom in an eprom and replace the OS chip with that to di...
by DutchAcorn
Wed Apr 10, 2019 7:33 pm
Forum: hardware
Topic: BBC B+ thinks it's a BBC A?
Replies: 19
Views: 543

Re: BBC B+ thinks it's a BBC A?

LordVaderUK wrote:
Wed Apr 10, 2019 5:21 pm
danielj wrote:
Wed Apr 10, 2019 8:27 am
And what happens if you try modes 0-3?
It says “Bad mode”...
What about mode 128?
by DutchAcorn
Fri Apr 05, 2019 11:28 am
Forum: hardware
Topic: Non booting BBC/B Issue 7 - Continuous beep
Replies: 58
Views: 878

Re: Non bootong BBC/B Issue 7 - Continuous beep

Mode 0 should give you uncorrupted characters for the top part of the screen.
by DutchAcorn
Fri Apr 05, 2019 6:39 am
Forum: hardware
Topic: Non booting BBC/B Issue 7 - Continuous beep
Replies: 58
Views: 878

Re: Non bootong BBC/B Issue 7 - Continuous beep

I’d say this makes IC62 the prime suspect.

Bit 1 seems to be pulled high, making an A show as a C and space as a “. As this is CAS0 (using the inverter), bit 1 is stored in IC62.
by DutchAcorn
Thu Apr 04, 2019 6:50 pm
Forum: hardware
Topic: Non booting BBC/B Issue 7 - Continuous beep
Replies: 58
Views: 878

Re: Non bootong BBC/B Issue 7 - Continuous beep

No, I haqdn't. I was pretty confident in both as they came from the good board. However, I thought I'd do it anyway and sadly, using the chip puller has pulled the pastic housing of IC3 off the board. :shock: All the pins are intact on the board itself. I'll attempt to pop it back but I'm not confi...
by DutchAcorn
Thu Apr 04, 2019 2:09 pm
Forum: hardware
Topic: Non booting BBC/B Issue 7 - Continuous beep
Replies: 58
Views: 878

Re: Non bootong BBC/B Issue 7 - Continuous beep

Does the beeeeb stop after you press break?
by DutchAcorn
Thu Apr 04, 2019 2:08 pm
Forum: hardware
Topic: Non booting BBC/B Issue 7 - Continuous beep
Replies: 58
Views: 878

Re: Non bootong BBC/B Issue 7 - Continuous beep

No, it’s not. Does the keyboard work? Did you (correctly) replace the system VIA (6522, IC3)? Yep, both VIAs in situ. Keyboard Caps Lock & Shift Lock leds lit, keyboard does NOT respond until break is pressed. At this point I can use the keyboard but apart from the default MODE, no others seem to b...
by DutchAcorn
Thu Apr 04, 2019 10:35 am
Forum: hardware
Topic: Non booting BBC/B Issue 7 - Continuous beep
Replies: 58
Views: 878

Re: Non bootong BBC/B Issue 7 - Continuous beep

No, it’s not. Does the keyboard work? Did you (correctly) replace the system VIA (6522, IC3)?
by DutchAcorn
Thu Apr 04, 2019 9:46 am
Forum: hardware
Topic: Non booting BBC/B Issue 7 - Continuous beep
Replies: 58
Views: 878

Re: Non bootong BBC/B Issue 7 - Continuous beep

I don’t see you mention trying S25 south? See this (very recent) post: viewtopic.php?f=3&t=16852&view=unread#p232947
by DutchAcorn
Wed Apr 03, 2019 6:50 pm
Forum: hardware
Topic: my beeb just pegged it :(
Replies: 26
Views: 650

Re: my beeb just pegged it :(

...i'm now waiting for my girlfriend to wake up for her night shift so's i can start digging round the bedroom for my other 2 faulty beebs and hopefully find more socketed ram so i don't have to buy any and wait for delivery... Now that you know the S25 trick you can try that on the other BBCs as w...
by DutchAcorn
Wed Apr 03, 2019 6:00 pm
Forum: hardware
Topic: my beeb just pegged it :(
Replies: 26
Views: 650

Re: my beeb just pegged it :(

yup, 61-68 are all socketed... (and reseating them didn't help) i was just reading about the hex invertor trick, luckily i have a bunch of those hanging about that i use to hack atari 2600 carts with eproms... so IC's 53-60 are normally the first 16k then? so it looks like the likely culprit is amo...
by DutchAcorn
Wed Apr 03, 2019 4:07 am
Forum: software
Topic: How to write disk images for the A3000 ?
Replies: 9
Views: 246

Re: How to write disk images for the A3000 ?

The file extension needs to be changed from .ADF to .ADL for omniflop. See here: viewtopic.php?f=41&t=16454&p=226679#p226674
by DutchAcorn
Tue Apr 02, 2019 4:54 am
Forum: hardware
Topic: Looking for advice on a BBC Micro, is it worth fixing?
Replies: 36
Views: 1193

Re: Looking for advice on a BBC Micro, is it worth fixing?

A Gotek is also nice but you would need to install a disk interface in the BBC first to use one of those. Unless it's a Model A, didn't it come with one? A basic model B came disk interface “ready” but would need a disk controller, a disk filing system rom, additional logic and a few modifications ...
by DutchAcorn
Mon Apr 01, 2019 8:09 pm
Forum: hardware
Topic: Looking for advice on a BBC Micro, is it worth fixing?
Replies: 36
Views: 1193

Re: Looking for advice on a BBC Micro, is it worth fixing?

Definitely, I'm hoping to get Elite running on it once I figure out how to get the download (available from frontier) from my PC onto a tape :P I suspect there may be some dodgy audio cable patching in my future :D :D Congrats on fixing it! It's fun messing around with tapes for a while but a modes...
by DutchAcorn
Sun Mar 31, 2019 12:31 pm
Forum: off-topic
Topic: Atari 2600
Replies: 27
Views: 530

Re: Atari 2600

Pitfall 2 - simply brilliant Adventure - a work of genius I only ever plyed Pitfall 1 on my mate’s Atari but we spent hours playing Adventure! Superb stuff. .... Ah Adventure! I remember the awe when we discovered, after many hours of playing, the easter egg in Adventure. “Created by Warren Robinet...
by DutchAcorn
Sat Mar 30, 2019 9:30 pm
Forum: hardware
Topic: BeebSCSI mini power
Replies: 1
Views: 319

Re: BeebSCSI mini power

Finally got round to installing my BeebSCSI mini. Using PL14 for power works great, thanks for the suggestion!
by DutchAcorn
Sun Mar 24, 2019 3:16 pm
Forum: hardware
Topic: BBC B+ 64k EEPROMs and SW RAM
Replies: 17
Views: 539

Re: BBC B+ 64k EEPROMs and SW RAM

Note for the startup banner to count the memory correctly you need DFS.2.26. You can also look at this thread: https://stardot.org.uk/forums/viewtopic.php?f=3&t=9483 To take the memory upgrade one step further you can stack a fourth memory chip and lead pin 20 of that top one to the south pin of S13...
by DutchAcorn
Sun Mar 24, 2019 7:16 am
Forum: software: other
Topic: Getting .SSD or .DSD images onto real floppies.
Replies: 8
Views: 268

Re: Getting .SSD or .DSD images onto real floppies.

Omniflop is probably the fastest and most convenient way but yes, it takes an XP computer with a 1.2 FDD and a compatible (old) motherboard. My second favourite way is using the UltraX DFS ROM. It lets you copy between virtual and real disk drives. You'll need sideways RAM or be able to blow an EPRO...
by DutchAcorn
Fri Mar 22, 2019 9:12 pm
Forum: other vintage computer hardware, software and games
Topic: Exidy Sorcerer
Replies: 43
Views: 3336

Re: Exidy Sorcerer

...This time we have an Exidy Sorcerer, which fell into my lap totally unexpectedly from its previous owner who'd had it from new. It's equipped with a Liveport FDM 180 hard sectored disk drive and should boot into CP/M. ... Strictly speaking, it is not the drive that is hard sectored but the contr...
by DutchAcorn
Fri Mar 22, 2019 4:29 pm
Forum: software
Topic: Help with a forlorn A3010 please
Replies: 42
Views: 810

Re: Help with a forlorn A3010 please

The Archimedes range is notorious for IDE compatibility issues. I remember using an IDE interface for my A310 bitd that was so fussy about the type of IDE drive used that it had a list of the specific types of drives in the user guide that the interface was known to work with. Only specific CF card ...
by DutchAcorn
Fri Mar 22, 2019 4:17 pm
Forum: other vintage computer hardware, software and games
Topic: '80s computer geeks' pictures.....
Replies: 19
Views: 463

Re: '80s computer geeks' pictures.....

Interacting almost daily with these 35+ year old computers actually makes the 80’s feel closer for me. My 9 year old son now prefers BBC games to the games he has access to on the family iPad so for him the BBC has become part of his youth and these computers have a place in this decade (although he...
by DutchAcorn
Fri Mar 22, 2019 3:54 pm
Forum: other vintage computer hardware, software and games
Topic: '80s computer geeks' pictures.....
Replies: 19
Views: 463

Re: '80s computer geeks' pictures.....

sweh wrote:
Fri Mar 22, 2019 3:14 pm
.... they had a room of Beebs (connected to an odd floppy sharing system) for most of their stuff.
One of these by any chance?
by DutchAcorn
Thu Mar 21, 2019 8:58 pm
Forum: emulators
Topic: Model B Keys vs PC Keys
Replies: 4
Views: 161

Re: Model B Keys vs PC Keys

Is this what you are looking for?
8C3DE2B4-15E2-4E68-8C81-B814C9D6EF7E.jpeg
It shows which function key does what. Normally in an emulator this maps to the PC function keys where f0 on the BBC (the far left key) is function key 10 on the PC.
by DutchAcorn
Wed Mar 20, 2019 2:37 pm
Forum: introduce yourself
Topic: Acorn Electron fan, just joined
Replies: 29
Views: 455

Re: Acorn Electron fan, just joined

Welcome, enjoy Stardot!

An Elk with a fan! Never knew they needed one.

I hope you realise these seemingly innocent Elks can be a gateway computer to a serious Acorn retro addiction.