Search found 47 matches

by sP1d3r
Tue Jun 02, 2020 10:24 am
Forum: 32-bit acorn hardware
Topic: Acorn "POST box" display adaptor (0086,804)
Replies: 89
Views: 4028

Re: Acorn "POST box" display adaptor (0086,804)

:o Hi

I thought it might interest you to see a small soldering practice kit I've got, it has 0.5mm pitch contacts as well as 1mm pitch.
They are cheap to buy on eBay etc., you can gain some useful experience of soldering.
There's no SSOP28 included, you'd have to buy a suitable one also.
by sP1d3r
Mon Jun 01, 2020 10:33 pm
Forum: for sale / freebies
Topic: Needs must . . . Lots of items for sale . . .
Replies: 1
Views: 257

Re: Needs must . . . Lots of items for sale . . .

Hi Dave

Is the Risc PC still available?

Please PM me.

:-&
by sP1d3r
Tue May 26, 2020 2:03 pm
Forum: 32-bit acorn hardware
Topic: A3000 power on test check error
Replies: 74
Views: 2841

Re: A3000 power on test check error

:shock: I’d not put WD40 anywhere near the inside of my computers... Agree it works nicely in cars, keeping out moisture from spark plugs - but this is because it coats the surface of spark plugs/ht leads/etc with a film of oil - and it removes carbon deposits by chemical action. Since the contact ...
by sP1d3r
Tue May 26, 2020 11:44 am
Forum: 32-bit acorn hardware
Topic: A3000 power on test check error
Replies: 74
Views: 2841

Re: A3000 power on test check error

I used IPA to thoroughly clean the legs of the LED and then some WD40 on a cotton bud to lubricate the led and the contact pad, dab the pad carefully or you'll rub away the conductive layer. WD40 improves electrical contacts, e.g. spraying on ht leads and spark plugs to keep out moisture. :shock: I...
by sP1d3r
Tue May 26, 2020 8:38 am
Forum: 32-bit acorn hardware
Topic: A3000 power on test check error
Replies: 74
Views: 2841

Re: A3000 power on test check error

Thanks! What did you use to clean the contact between the membrane and LEDs? I tried some IPA but didn't notice any improvement. The Caps Lock is very feint but cannot see any light from the num lock or scroll lock. Apart from the keyboard LEDs everything seems good now :) I used IPA to thoroughly ...
by sP1d3r
Mon May 25, 2020 5:21 pm
Forum: 32-bit acorn hardware
Topic: The Watford Gap
Replies: 7
Views: 415

Re: The Watford Gap

The card only supplies 3 configuration parameters: IDEFSBuffers and IDEFSDirCache, where I've idly experimented with all sorts of numbers, none of which make any difference (they're both on 32 at the moment), and IDFSDrive, which is 4 as one would expect. *CAT and all file operations from the comma...
by sP1d3r
Mon May 25, 2020 8:35 am
Forum: 32-bit acorn hardware
Topic: A3000 power on test check error
Replies: 74
Views: 2841

Re: A3000 power on test check error

Not sure what to suggest, if the test roms show a video display, then aiui risc os 2 should display something. I don't think swapping from test roms to risc os 2 should need any link changes. How confident are you in the risc os roms being all good? Can you post pictures of the roms fitted and the ...
by sP1d3r
Mon May 25, 2020 8:16 am
Forum: 8-bit acorn hardware
Topic: Dead Elk, any ideas?.
Replies: 42
Views: 916

Re: Dead Elk, any ideas?.

:^o Hi I get the same screen as the one that you've posted, but it's only when I put my Slogger Pegasus into my Plus 1. I was wondering what issue pcb you have in yours, an Issue A by any chance? All Issue 4 PCB. I did try a good working ULA in it and no joy, thinking it could be the 6502 in both c...
by sP1d3r
Sun May 24, 2020 7:45 pm
Forum: 8-bit acorn hardware
Topic: Dead Elk, any ideas?.
Replies: 42
Views: 916

Re: Dead Elk, any ideas?.

:-s :roll: I think that the issue A Pegasus PCB may need some modifications to work, I noticed some of the data line connections on the circuit diagram are cross-connected but as I don't have much time at the moment for investigating a PCB, it'll have to wait. If the data lines are “cross-connected”...
by sP1d3r
Sun May 24, 2020 6:34 pm
Forum: 8-bit acorn hardware
Topic: Dead Elk, any ideas?.
Replies: 42
Views: 916

Re: Dead Elk, any ideas?.

:^o Hi I get the same screen as the one that you've posted, but it's only when I put my Slogger Pegasus into my Plus 1. I was wondering what issue pcb you have in yours, an Issue A by any chance? If your Pegasus is faulty, please return it and I'll fix. PM sent . . . . Dave H :D :D No worries Dave,...
by sP1d3r
Sun May 24, 2020 4:00 pm
Forum: 8-bit acorn hardware
Topic: Dead Elk, any ideas?.
Replies: 42
Views: 916

Re: Dead Elk, any ideas?.

:roll: I think that the issue A Pegasus PCB may need some modifications to work, I noticed some of the data line connections on the circuit diagram are cross-connected but as I don't have much time at the moment for investigating a PCB, it'll have to wait. Regarding the strange screen display, perha...
by sP1d3r
Sun May 24, 2020 2:57 pm
Forum: 8-bit acorn hardware
Topic: Dead Elk, any ideas?.
Replies: 42
Views: 916

Re: Dead Elk, any ideas?.

That's interesting, the edge connector on the Pegasus cartridge is clean but as the issue A PCBs that I've seen differ somewhat from each other I think that the arrangement and value of the capacitors on the PCB may be relevant to the particular display. I've bought the two PCBs in the middle of th...
by sP1d3r
Sun May 24, 2020 1:39 pm
Forum: 8-bit acorn hardware
Topic: Dead Elk, any ideas?.
Replies: 42
Views: 916

Re: Dead Elk, any ideas?.

Having experienced problems at boot up when my cartridge experiments don't respond to the bus correctly, maybe it's just the case that the edge connector on the Pegasus cartridge needs cleaning. Something to try, perhaps. :) Edit: Fixed typo. That's interesting, the edge connector on the Pegasus ca...
by sP1d3r
Sun May 24, 2020 10:21 am
Forum: 8-bit acorn hardware
Topic: Dead Elk, any ideas?.
Replies: 42
Views: 916

Re: Dead Elk, any ideas?.

:^o Hi
I get the same screen as the one that you've posted, but it's only when I put my Slogger Pegasus into my Plus 1.
I was wondering what issue pcb you have in yours, an Issue A by any chance?
by sP1d3r
Sun May 24, 2020 6:47 am
Forum: 32-bit acorn hardware
Topic: Acorn Type 1 Mouse feet
Replies: 7
Views: 246

Re: Acorn Type 1 Mouse feet

:roll: The 100mA figure was overly generous, I've looked at the A3020 Welcome Guide, which I downloaded from: http://chrisacorns.computinghistory.org.uk/Computers/A3020.html and on page V the figure quoted is actually 80mA. Because the leds in the mouse operate an opto-coupler pick-up system, the ef...
by sP1d3r
Sat May 23, 2020 4:11 pm
Forum: 32-bit acorn hardware
Topic: The Watford Gap
Replies: 7
Views: 415

Re: The Watford Gap

Hi

Can I ask whether you made the IDE drive that you're using with the interface that you're using, with the Watford IDEUtils?

Also, have you configured an IDE drive in !Configure?
by sP1d3r
Sat May 23, 2020 8:01 am
Forum: 32-bit acorn hardware
Topic: Acorn Type 1 Mouse feet
Replies: 7
Views: 246

Re: Acorn Type 1 Mouse feet

:oops: I just noticed that the current draw of a type 4 mouse is 125mA. I recall reading the technical reference manual for, I believe, A30x0 & A4000 and the manual states that the maximum current draw for a mouse should be 100mA. I suppose that it's possible that the A3020 has a beefed-up psu in co...
by sP1d3r
Fri May 22, 2020 11:26 am
Forum: 32-bit acorn hardware
Topic: Acorn Type 1 Mouse feet
Replies: 7
Views: 246

Re: Acorn Type 1 Mouse feet

#-o Thanks again Philpem, it's a type 4. I'm not the original owner so I don't know anything about it and I haven't got a ball, the retaining ring or a cable for it so I've no idea if it works. I read a post about Acorn mice with failed leds a while ago, I seem to recall that the leds looked discolo...
by sP1d3r
Fri May 22, 2020 8:48 am
Forum: 32-bit acorn hardware
Topic: Acorn Type 1 Mouse feet
Replies: 7
Views: 246

Re: Acorn Type 1 Mouse feet

Thanks for the info Philpem, that's useful to know.
More modern mice usually have the screws under the pads so some spares would come in useful.

Do you know what type of mouse the one in the picture is?
by sP1d3r
Thu May 21, 2020 7:53 am
Forum: 32-bit acorn hardware
Topic: Acorn Type 1 Mouse feet
Replies: 7
Views: 246

Acorn Type 1 Mouse feet

](*,) I've found a fix for Type 1 Acorn mice with missing 'feet', or the little plastic pads on the underside of the mouse. This also applies to Amx mice with similar parts. Without the 'feet' the mouse won't sit level but they're not the sort of thing that you can easily buy these days. I had some ...
by sP1d3r
Sun May 10, 2020 11:38 am
Forum: 32-bit acorn hardware
Topic: A3000 power on test check error
Replies: 74
Views: 2841

Re: A3000 power on test check error

:-& Hi

Can you give some idea of how much usage your ARM 3 arc has had, also do you have any facts and figures relating to the power consumption of the CPU in relation to the standard ARM 2?
by sP1d3r
Thu Apr 30, 2020 10:47 am
Forum: 32-bit acorn hardware
Topic: Bush Internet IBX250
Replies: 21
Views: 891

Re: Bush Internet IBX250

#-o I've so far been unable to work out the problem with the stb desktop, Chris Whytehead's instructions may prove to be more successful though. The pictures show what happens; the desktop, pushing the ok button which causes the double arrow and ctrl-S which shows the pinboard menu options. Andrew F...
by sP1d3r
Wed Apr 29, 2020 11:07 am
Forum: 32-bit acorn hardware
Topic: RISC PC Disappearing Memory
Replies: 22
Views: 1373

Re: RISC PC Disappearing Memory

:o I don't know for sure but I'd hazard a guess that because the Risc Pc wasn't 'engineered' with 128MB simm's in mind, using them is reliant upon the ability of the simm socket to deliver the necessary voltages to maintain the integrity of volatile memory. The power requirement of a 128MB simm is l...
by sP1d3r
Tue Apr 28, 2020 10:23 am
Forum: 32-bit acorn hardware
Topic: Bush Internet IBX250
Replies: 21
Views: 891

Re: Bush Internet IBX250

I copied the roms using my eprom programmer, the roms are 2 x 27C322, as far as I know.

I also noticed that Peter Howkins, the author of RPCEmu, has a module database on the RPCEmu website which probably contains the RO-NC version modules.
by sP1d3r
Mon Apr 27, 2020 10:23 pm
Forum: 32-bit acorn hardware
Topic: Bush Internet IBX250
Replies: 21
Views: 891

Re: Bush Internet IBX250

Hi I've an IBX250 and I was able to follow Andrew Flegg's instructions (on www.bleb.org) to hack the box but unfortunately the hack, which I achieved using the RPCEmu and an A3020 to transfer file to the zip drive, didn't quite work properly because the Risc-Os NC version in my STB differs from the ...
by sP1d3r
Tue Mar 31, 2020 10:13 pm
Forum: 32-bit acorn hardware
Topic: A3000 power on test check error
Replies: 74
Views: 2841

Re: A3000 power on test check error

:roll: The thing about repairing a vintage computer is that whilst your meter shows continuity when you test, when the board is powered up it might still not work properly if the signal path is degraded. The kind of beep that you get is a clue, the probes need to be cleaned with IPA and contact with...
by sP1d3r
Sun Mar 29, 2020 11:21 pm
Forum: 32-bit acorn hardware
Topic: A3000 power on test check error
Replies: 74
Views: 2841

Re: A3000 power on test check error

Hi I wondered if you'd seen the 'Very Dead A3000' post re: L7->8051 connection, also beware PS/2 to Quad adapters. I bought one of the ones on eBay and although it worked for about 3-4 times, the mouse cursor froze and would only work after Power on/Delete until it's now frozen, see picture. The PIC...
by sP1d3r
Tue Mar 24, 2020 12:39 pm
Forum: 32-bit acorn hardware
Topic: Partially Working A4000 - Help!!
Replies: 79
Views: 9208

Re: Partially Working A4000 - Help!!

:D Although I know nothing about the problems with the A4000 that've so far been described, the basic problem sounds to me like it may be connected with a faulty Zener diode or a component that a zener enables.

Hope of help.
by sP1d3r
Mon Mar 23, 2020 1:41 pm
Forum: for sale / freebies
Topic: FOR SALE: WH SMITH CPD8300 Data cassette recorder
Replies: 6
Views: 363

Re: FOR SALE: WH SMITH CPD8300 Data cassette recorder

Hi

The Spectrum mode makes the output level louder I'd have thought, because Spectrum load levels are significantly higher than a BBC, I've found.

BBC or Electron tapes will load ok if the tapes are ok but with tapes that aren't in good condition a tone control can help.
by sP1d3r
Sun Mar 22, 2020 1:39 pm
Forum: for sale / freebies
Topic: Clear out of IC's
Replies: 12
Views: 701

Re: Clear out of IC's

I've worked out how to view that page, much appreciated.

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