Search found 168 matches

by munchausen
Tue Mar 07, 2017 11:35 am
Forum: for sale / freebies
Topic: Saw this DEC laptop with A4 case
Replies: 2
Views: 516

Saw this DEC laptop with A4 case

Noticed this, almost identical to the A4 but in beige! Ending very soon...

http://www.ebay.co.uk/itm/252786791572? ... EBIDX%3AIT
by munchausen
Sun Jan 29, 2017 6:50 pm
Forum: hardware
Topic: A3010 hard disc interface
Replies: 159
Views: 22379

Re: A3010 hard disc interface

I don't have any other acorn machines, so it's impossible for me to know if any of my cards will work or not in advance of trying them. Have you tried formatting/partitioning on the machine directly with hform (which is where I get stuck)? I've thought for a while I should probably invert the signal...
by munchausen
Sun Jan 29, 2017 1:40 pm
Forum: hardware
Topic: A3010 hard disc interface
Replies: 159
Views: 22379

Re: A3010 hard disc interface

This is awesome! Well done!

I'd be interested to see your schematics to see if there are any differences to my veroboard implementation.
by munchausen
Thu Jan 19, 2017 9:53 am
Forum: hardware
Topic: Think I've killed my A310
Replies: 3
Views: 541

Re: Think I've killed my A310

If the battery was shorted it will get hot, but I wouldn't expect anything else to be damaged. Unless the reason it was shorted was that something else was damaged... but it does sound like it needs a careful check. Of course one of the electronics gurus on here might know differently (I'm just a ha...
by munchausen
Tue Jan 03, 2017 2:07 pm
Forum: hardware
Topic: A3010 hard disc interface
Replies: 159
Views: 22379

Re: A3010 hard disc interface

Yeah, I don't know if that pin really matters (at least connecting it or not hasn't made any difference). I suspect supply noise/grounding or wiring issues are my problem, I think I should get some low ESR caps and perhaps check some of the connections, then crack out the logic analyser and see what...
by munchausen
Mon Nov 14, 2016 11:36 am
Forum: hardware
Topic: Today I overclocked my A3010
Replies: 297
Views: 23095

Re: Today I overclocked my A3010

The boards arrived, and on initial inspection they look perfect - the main connectors are the exact distance apart to fit in the A3010, and the RAM footprints match the RAMs vectorlight sent me (the two things I had a slight concern over).
a3010 ram boards.jpg
by munchausen
Fri Nov 11, 2016 3:16 pm
Forum: hardware
Topic: A3010 hard disc interface
Replies: 159
Views: 22379

Re: A3010 hard disc interface

Just a quick note to say that I've tried the various suggestions here and have not had any improvement. To be precise; I've added a 100uF decoupling cap to the power rails, 100nF to both ICs, 22ohm resistors in series with IOR, IOW and !I13, and have grounded IOCS16. I think when I next get a chance...
by munchausen
Sun Nov 06, 2016 2:30 pm
Forum: hardware
Topic: A3020 EtherLan 210
Replies: 44
Views: 4296

Re: A3020 EtherLan 210

I've looked at it a bit more and there are a few issues (though this is a bit of a black art, especially with such an old ethernet phy, so it might work as is): I need to disconnect the shield ground and add a couple of capacitors. I also may have pins 1 and 2 swapped. I've ordered one of these and ...
by munchausen
Sun Nov 06, 2016 3:03 am
Forum: hardware
Topic: A3020 EtherLan 210
Replies: 44
Views: 4296

Re: A3020 EtherLan 210

So I think I've got this figured out, but not 100% on it yet.
10baset_mau_top.png
10baset_mau_bottom.png
(Also, want to get all the SMD parts on the same side). Updated
by munchausen
Sat Nov 05, 2016 1:30 pm
Forum: hardware
Topic: A3020 clean up
Replies: 33
Views: 2628

Re: A3020 clean up

Zip drive or network are the way forward. I didn't realise the SD adapters were hard to find. I think there's an SD->LIF IDE adapter that has the right IC (www.ebay.co.uk/itm/291583534333) then you just need to convert that to 44 pin IDE (http://www.ebay.co.uk/itm/291255302183). Less than £20 all to...
by munchausen
Sat Nov 05, 2016 8:39 am
Forum: hardware
Topic: A3020 clean up
Replies: 33
Views: 2628

Re: A3020 clean up

I've done the mouse trick for my machine, but I can no longer see that mouse available on ebay :( Quadrature converters are available for amiga and atari fairly cheap on ebay, and you only need to convert the connector to use them with an acorn. You can source a replacement battery but it is safer t...
by munchausen
Fri Nov 04, 2016 1:31 pm
Forum: hardware
Topic: Today I overclocked my A3010
Replies: 297
Views: 23095

Re: Today I overclocked my A3010

I've just ordered 10 PCBs, they're going to take at least a couple of weeks to arrive. I also ordered an SMD rework station yesterday to do the work. I still need to get a few bits like paste and flux, and the pin headers and RAM itself. With regards to the RAM, can I buy a couple of spare chips fro...
by munchausen
Fri Nov 04, 2016 8:29 am
Forum: hardware
Topic: Battery Damage - A3000
Replies: 29
Views: 2301

Re: Battery Damage - A3000

Image
by munchausen
Thu Nov 03, 2016 10:34 pm
Forum: hardware
Topic: Battery Damage - A3000
Replies: 29
Views: 2301

Re: Battery Damage - A3000

Two black lines on a resistor, 0 ohm and 0 multiplier...
by munchausen
Thu Nov 03, 2016 10:53 am
Forum: hardware
Topic: Battery Damage - A3000
Replies: 29
Views: 2301

Re: Battery Damage - A3000

It seems clear they are some kind of filter or input protection, but they also clearly aren't strictly necessary. They do look like some kind of choke, and it makes sense given that the mouse is essentially just some switches and phototransistors at the end of a wire. But it is still a little odd th...
by munchausen
Wed Nov 02, 2016 8:08 am
Forum: hardware
Topic: Battery Damage - A3000
Replies: 29
Views: 2301

Re: Battery Damage - A3000

It's odd, but though I would have assumed those L* parts are inductors I'm pretty sure they are just links. Perhaps someone more familiar with old schematics can have a look, because they are marked in an unusual way, but they don't appear to have any function: A3000 mouse socket.png R7 is a 180R re...
by munchausen
Mon Oct 31, 2016 6:48 am
Forum: hardware
Topic: Zip Drive Barrel Connector
Replies: 10
Views: 889

Re: Zip Drive Barrel Connector

Sorry, I saw Martin's reply and thought you were sorted, so didn't check yesterday! It sounds like you've got it now :)
by munchausen
Sat Oct 29, 2016 6:48 pm
Forum: hardware
Topic: Zip Drive Barrel Connector
Replies: 10
Views: 889

Re: Zip Drive Barrel Connector

I'll try and measure mine with a caliper when I'm in the garage tomorrow (if no one gets there first)...
by munchausen
Tue Oct 25, 2016 11:39 am
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 77
Views: 7489

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!

I tried this out with my A3010 hard disc mod and it doesn't find any drives. I think there is still an issue in my circuit somewhere...
by munchausen
Tue Oct 25, 2016 11:32 am
Forum: hardware
Topic: Tongue-tied A3010
Replies: 19
Views: 2653

Re: Tongue-tied A3010

Just realised I forgot to respond to the actual problem of this thread: The sound works fine. Just connect 12V to pin 2 of LK2. LK2 is located near the mains connector. Pin 2 is the side nearest the front of the machine. Also, as far as I can tell -12V is not needed, and you also don't need to conne...
by munchausen
Sat Oct 22, 2016 10:18 pm
Forum: hardware
Topic: Tongue-tied A3010
Replies: 19
Views: 2653

Re: Tongue-tied A3010

Well I just got it sorted well enough that I can at least put the machine back together. New socket is mounted using two newly drilled holes. Using a 4 pin connector, two pins to carry 12V and GND, and the other two to go to the A3010 power switch, used to turn the xbox PSU on and off using its 5V a...
by munchausen
Wed Oct 19, 2016 3:14 pm
Forum: hardware
Topic: Tongue-tied A3010
Replies: 19
Views: 2653

Re: Tongue-tied A3010

Success - my A3010 lives again!

Haven't managed to mount it all neatly yet, but it starts/shuts down completely reliably now :)
by munchausen
Mon Oct 17, 2016 9:18 am
Forum: hardware
Topic: Today I overclocked my A3010
Replies: 297
Views: 23095

Re: Today I overclocked my A3010

I'd still like to try out those 28ns RAMs after this, but at least to start with the expansion will only be 1M. That should be enough to see how fast the rest of the system can go, then if it's worth while I'll see about a larger/faster expansion. Did some of you guys have spare 50ns RAMs? Occurred...
by munchausen
Fri Oct 14, 2016 12:55 pm
Forum: hardware
Topic: Tongue-tied A3010
Replies: 19
Views: 2653

Re: Tongue-tied A3010

I think I've found the most inexpensive way to do this: grab an xbox 360 PSU (I just got one for a fiver posted on ebay) and mod it to simply provide 12V (at 12A!). Then you can use a 12V to 5V (5A) step down converter (something like this http://www.ebay.co.uk/itm/291764292104) to get the 5V supply...
by munchausen
Thu Jul 28, 2016 9:22 am
Forum: hardware
Topic: A3010 4 Mbyte RAM upgrade, the SIMM way
Replies: 26
Views: 2894

Re: A3010 4 Mbyte RAM upgrade, the SIMM way

Could you please tell me if this kind of cables has the right characteristics to do the connections ? http://www.ebay.com/itm/65Pcs-Male-to-Male-Solderless-Flexible-Breadboard-Jumper-Cable-Wires-For-Arduino-/252107574004?hash=item3ab2c84af4:g:JBUAAOSwv0tVAV2q Personally I think I would use a 2.54mm...
by munchausen
Mon Jul 25, 2016 11:03 am
Forum: hardware
Topic: A3010 4 Mbyte RAM upgrade, the SIMM way
Replies: 26
Views: 2894

Re: A3010 4 Mbyte RAM upgrade, the SIMM way

with the addition of A9 from what you sent to me (it's the not connected pin 22 of the 514260ZP chip). The pinout I sent you has A9 connected, in the same location as in yours! This location comes from you : I took it from you and simply checked all the others you provided with the layout of the RA...
by munchausen
Sun Jul 24, 2016 7:24 pm
Forum: hardware
Topic: A3xx/A4xx Oblong FDD LED's
Replies: 7
Views: 720

Re: A3xx/A4xx Oblong FDD LED's

I don't know exactly what the one you're replacing looks like, but oblong LEDs are a common part. e.g.

http://www.ebay.co.uk/itm/20-Piece-Rect ... SwHnFVxMvp

You'll also find them at rapid, farnell, rs, mouser etc.
by munchausen
Sun Jul 24, 2016 7:19 pm
Forum: hardware
Topic: A3010 4 Mbyte RAM upgrade, the SIMM way
Replies: 26
Views: 2894

Re: A3010 4 Mbyte RAM upgrade, the SIMM way

Zarchos wrote: with the addition of A9 from what you sent to me (it's the not connected pin 22 of the 514260ZP chip).
The pinout I sent you has A9 connected, in the same location as in yours!
by munchausen
Sun Jul 24, 2016 1:09 pm
Forum: hardware
Topic: A3010 4 Mbyte RAM upgrade, the Russian way (aka Spider ram)
Replies: 13
Views: 1487

Re: A3010 4 Mbyte RAM upgrade, the Russian way (aka Spider ram)

The experiment failed. Good news now I'm going to focus on the Bad Apple demo :wink: I'll try again tomorrow to check the wires but honestly once everything is soldered it's just impossible to trace which goes where. OK so I checked because I was very surprised it didn't work, the soldering is quit...
by munchausen
Sun Jul 24, 2016 12:49 pm
Forum: hardware
Topic: A3010 4 Mbyte RAM upgrade, the SIMM way
Replies: 26
Views: 2894

Re: A3010 4 Mbyte RAM upgrade, the SIMM way

Looks right to me poink :)

I'm reassured to see your A3010 RAM pinout matches with mine.

I still don't know where you're going to actually find space for the SIMMs? Perhaps a daughter-board with a cable?