Search found 115 matches

by dsdf323
Sun Feb 21, 2021 5:42 am
Forum: 8-bit acorn software: other
Topic: Torch MCP Versions
Replies: 26
Views: 2965

Torch C-Series "label printer"

I thought this looked interested and probably none exist in Australia - would be an interesting refurb. project. As an integrated desktop system, the computer included a colour monitor and twin 5.25" floppy disk drives and a modem for connection to remote data. One of the above pictures shows a...
by dsdf323
Sat Feb 13, 2021 4:24 am
Forum: 8-bit acorn hardware
Topic: STL mini cart
Replies: 6
Views: 520

Solidisk STL Mini Cartridge

I've got a Mini(R) Cartridge and two different types of ROM socket cards.

The one on the right had a bunch of junk on it, which I've stripped as it was a mess of chips on top of chips and wires everywhere.

Not really sure about them.

Brett
by dsdf323
Wed Feb 10, 2021 10:03 am
Forum: 8-bit acorn hardware
Topic: Fault finding index
Replies: 114
Views: 71438

Continuous tone on boot

I did a search for "ic72" and didn't get a match. Was sent a dead Model B to look at - was working, something went "pow" and then it just gave continuous tone on boot. I think a SCSI drive may have been connected via the 1MHz port. Went through all the usual suspects with a logic...
by dsdf323
Thu Dec 31, 2020 9:11 pm
Forum: 8-bit acorn hardware
Topic: Kenda "The Professional" DMFS
Replies: 83
Views: 4016

Re: Kenda "The Professional" DMFS

Excellent news!
by dsdf323
Wed Dec 30, 2020 12:04 am
Forum: other vintage hardware, software and languages
Topic: Elan Enterprise
Replies: 27
Views: 5083

Added 8-pin DIN socket for RGB output

Hello - a little late to the discussion about video output, but ... I'm using a CGA-to-VGA converter box from Microbee Technology here in Australia - I've just got it working on my Enterprise 128. https://microbeetechnology.com.au/vga-video-converter.htm I'm also using the box with the Commodore 128...
by dsdf323
Sun Oct 25, 2020 1:55 am
Forum: 8-bit acorn hardware
Topic: BNC socket
Replies: 16
Views: 1125

Re: BNC socket

This is what I've ended up doing now. [1] Remove the BNC socket and drill out the hole to 12mm. [2] Solder the right-angled RCA socket onto the board - need to drill out ... very carefully as it runs next to a track ... the front GND hole. Then really solder the socket on for mechanical strength. I ...
by dsdf323
Sat Oct 24, 2020 11:47 pm
Forum: 8-bit acorn hardware
Topic: BBC Model B Issue 7 not booting
Replies: 7
Views: 433

Re: BBC Model B Issue 7 not booting

Interestingly, after running fine for quite a few hours yesterday and today it suddenly hung - I like to run Robotron from ROM as it has a continuous demo mode. Pressing on IC5, the Teletext character generator, restores it. And it seems I have to do this after powering off: switch it on again, cont...
by dsdf323
Fri Oct 23, 2020 9:31 pm
Forum: 8-bit acorn hardware
Topic: BBC Model B Issue 7 not booting
Replies: 7
Views: 433

Re: BBC Model B Issue 7 not booting

flaxcottage wrote:
Fri Oct 23, 2020 7:09 pm
Can you swap 6502 and OS ROM into a known working Beeb? Then you'd know whether these were working OK.
Ahh, that was it - swapped in another 6502 and it booted. Thanks John.
by dsdf323
Fri Oct 23, 2020 9:27 pm
Forum: 8-bit acorn hardware
Topic: BBC Model B Issue 7 not booting
Replies: 7
Views: 433

Re: BBC Model B Issue 7 not booting

e668ecp wrote:
Fri Oct 23, 2020 6:53 pm
Dead OS chip?
Dah, I had reseated it but hadn't tried swapping it! Just tried two different original OS chips (not EPROMs), one known working, and no difference unfortunately.
by dsdf323
Fri Oct 23, 2020 4:30 am
Forum: 8-bit acorn hardware
Topic: BBC Model B Issue 7 not booting
Replies: 7
Views: 433

BBC Model B Issue 7 not booting

Hi, I've been puzzling over this one for a few days, reading dozens of different discussions. I'm not sure where to go to next - it seems the CPU is stalled due to SYNC & IRQ' ... ? On powering up I get continuous tone, no display. I've tried reseating all the socketed chips, and have replaced b...
by dsdf323
Wed Oct 21, 2020 9:35 am
Forum: 8-bit acorn hardware
Topic: BBC Micro Power Supply advanced repair
Replies: 8
Views: 1196

Re: BBC Micro Power Supply advanced repair

I've found a "local" (i.e. Australian) supplier (Wiltronics) for the BU508A which comes in the same TO-3 case as the BU208A to make the switch easier, so let's see ... it's coming from regional Victoria to regional NSW ...

BU508A in TO-3 case

Brett.
by dsdf323
Wed Oct 21, 2020 9:01 am
Forum: 8-bit acorn hardware
Topic: BBC Micro Power Supply advanced repair
Replies: 8
Views: 1196

Re: BBC Micro Power Supply advanced repair

On one electronic suppliers site, a BU508AW is shown as an alternative to the BU208A. Please note that I have not compared the relevant data between these transistors. So please do your own checks before buying and fitting. Thanks Mark. I put this PSU aside for a while and have now come back to it....
by dsdf323
Wed Sep 23, 2020 10:21 am
Forum: 8-bit acorn hardware
Topic: Beeb keyboard types
Replies: 11
Views: 748

Re: Beeb keyboard types

I can supply further photos/details of "square switch stalks" ... "type 1" it seems on that website, yet the keyswitches are wrong
by dsdf323
Sun Sep 20, 2020 11:10 am
Forum: 8-bit acorn hardware
Topic: Beeb keyboard types
Replies: 11
Views: 748

Beeb keyboard types

Hi, How many different types of keyboards are there, and what do we call them? I've encountered three different types down here in Australia, and definitely have my favourite. I'm tempted to think the better quality ones are the earlier ones, whereas the worse ones (in my opinion) are the later, cos...
by dsdf323
Sun Sep 20, 2020 2:02 am
Forum: 8-bit acorn hardware
Topic: Refurbishing BASF 6106 disc drive
Replies: 4
Views: 399

[COMPLETED] Refurbishing BASF 6106 disc drive

Wired it all up - kept the 5V output, perhaps use for a Gotek.
by dsdf323
Thu Sep 17, 2020 8:16 am
Forum: 8-bit acorn hardware
Topic: Refurbishing BASF 6106 disc drive
Replies: 4
Views: 399

Re: Refurbishing BASF 6106 disc drive

New power supply, power cable and illuminated DPDT switch installed in the repainted case.
by dsdf323
Thu Sep 17, 2020 1:23 am
Forum: 8-bit acorn hardware
Topic: BNC socket
Replies: 16
Views: 1125

Re: BNC socket

Drilled out the "video out" socket to 12mm and now the RCA plug fits in quite nicely.
by dsdf323
Tue Sep 15, 2020 11:24 pm
Forum: 8-bit acorn hardware
Topic: BNC socket
Replies: 16
Views: 1125

Re: BNC socket

I ended up using the black one (Mouser p/n 568-NYS354). I drilled out the ground holes to 2.5mm - the front pin won't reach so bent it forward a bit and then just dumped lots of solder on it from either side to make a connection. Seems to work - image is a bit noisy so will need to troubleshoot the ...
by dsdf323
Tue Sep 15, 2020 8:09 am
Forum: 8-bit acorn hardware
Topic: BNC socket
Replies: 16
Views: 1125

Re: BNC socket

Two slightly different types - they look promising when I hold them against the PCB.
by dsdf323
Mon Sep 14, 2020 8:02 am
Forum: 8-bit acorn hardware
Topic: BBC micro Watford Electronics DDFS support chips
Replies: 10
Views: 3570

Re: BBC micro Watford Electronics DDFS support chips

Hi,

Does anyone know if the link between pins 1 and 4 in IC86 is required for the DDB2 board? It's currently unpopulated. The DDB3 instructions say to put a link in there.

Thanks
by dsdf323
Wed Sep 09, 2020 9:00 pm
Forum: 8-bit acorn hardware
Topic: Refurbishing BASF 6106 disc drive
Replies: 4
Views: 399

Re: Refurbishing BASF 6106 disc drive

Repainting of the case is completed, just waiting on the power supply to arrive from Mouser in Singapore.

I realised that the additional 5V output could be used to power a Gotek.
by dsdf323
Wed Sep 09, 2020 8:40 pm
Forum: 8-bit acorn hardware
Topic: Recommended BBC Model B upgrades
Replies: 50
Views: 2094

Re: Recommended BBC Model B upgrades

See this thread which covers my deliberations in selecting ROMs. https://stardot.org.uk/forums/viewtopic.php?f=2&t=18845&p=262961#p262961 You may also have discovered that there is a quirk im Mark's rework instructions which brings the ROMs in in a strange order ... but that is a different ...
by dsdf323
Wed Sep 09, 2020 9:17 am
Forum: 8-bit acorn hardware
Topic: Recommended BBC Model B upgrades
Replies: 50
Views: 2094

Re: Recommended BBC Model B upgrades

I've been doing Mark @ RetroClinic's cheapo ROM socket upgrades on all my Beebs as it's pretty simple. http://www.retroclinic.com/acorn/swr/swr.htm Cuttin' a few tracks and soldering (or sodering if you're American) a few wires and you've got four "native" ROM sockets that take up to 64KB ...
by dsdf323
Sun Sep 06, 2020 1:06 am
Forum: 8-bit acorn hardware
Topic: Refurbishing BASF 6106 disc drive
Replies: 4
Views: 399

Re: Refurbishing BASF 6106 disc drive

Seems the drive is in good spirits - working nicely. I made up a power cable for the Beeb's aux. power port and connected it back to a machine with an 8271 FDC. Uploaded a short video to YouTube (my first in five years apparently) if you're interested in seeing the drive mechanism in action. https:/...
by dsdf323
Sat Sep 05, 2020 10:08 pm
Forum: 8-bit acorn hardware
Topic: BNC socket
Replies: 16
Views: 1125

Re: BNC socket

In terms of using the modulator phono socket, just desolder the two existing wires going into the modulator from the Beeb PCB. Tuck them into a position were they can’t short out to anything else. Inside the modulator, desolder the resistor lead that goes to the centre pin of the phono socket and p...
by dsdf323
Sat Sep 05, 2020 8:11 am
Forum: 8-bit acorn hardware
Topic: BNC socket
Replies: 16
Views: 1125

Re: BNC socket

I've ordered some of these from Mouser - had to get a power supply so threw some of these in with the order. http://www.mouser.com/ProductDetail/rean/nys354/?qs=MO8z%252b%252bLepAFDBU89%252bahhOw%3d%3d&countrycode=AU&currencycode=AUD http://www.mouser.com/ProductDetail/kobiconn/scp604uot3t00...
by dsdf323
Sat Sep 05, 2020 6:20 am
Forum: 8-bit acorn hardware
Topic: BNC socket
Replies: 16
Views: 1125

Re: BNC socket

Just chop some of this rubbish out ... carefully ... and run the composite video wires to the RCA socket?

I'm willing to try on one of my Beebs.
by dsdf323
Sat Sep 05, 2020 6:11 am
Forum: 8-bit acorn hardware
Topic: BNC socket
Replies: 16
Views: 1125

Re: BNC socket

I just remove the BNC and the wires and use RGB to SCART :shock: I wholeheartedly agree! The composite output really sucks compared to the RGB, but for the ones I refurbish for new homes, they might not have something that can use RGB straight away - SCART is that "weird European plug" an...
by dsdf323
Sat Sep 05, 2020 5:58 am
Forum: 8-bit acorn hardware
Topic: BNC socket
Replies: 16
Views: 1125

Re: BNC socket

I've been wondering the same - maybe there wasn't something in the 80's but what about 40 years later? The RCA connector of the RF modulator is fine, why not something similar for the composite video? I guess they were originally going for something like this? https://www.alibaba.com/product-detail/...

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