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Forum: support.Hardware 27 October 2019, 23:20
Replies: 12
Views: 344
Posted By jimbob
Thanks Bruce, that's good enough for me. :great ...

Thanks Bruce, that's good enough for me. :great

Confirmed that the current with button pressed is now ~14mA and if make the circuit after the 47R resistor it is ~20mA.

Micromys actually worked...
Forum: support.Hardware 27 October 2019, 04:54
Replies: 12
Views: 344
Posted By jimbob
Well, managed to get the mouse buttons working...

Well, managed to get the mouse buttons working but I'm not too happy with the solution.

I replaced the 68R resistors from both pin 9s with 47R.

I measured the Paula pin voltages with RMB...
Forum: support.Hardware 26 October 2019, 19:07
Replies: 12
Views: 344
Posted By jimbob
Well, I'm a bit stumped for the moment, must be a...

Well, I'm a bit stumped for the moment, must be a marginally failing component or trace somewhere as suggested. Here is the current state -

Both standard and micromys mouse tested fully working...
Forum: support.Hardware 24 October 2019, 01:05
Replies: 12
Views: 344
Posted By jimbob
Amiga seems to be working perfectly otherwise,...

Amiga seems to be working perfectly otherwise, can you give me a link? EDIT(found it!)


Just tried DiagROM. CIA tests all passed, with or without mouse plugged in or button pressed. Following...
Forum: support.Hardware 24 October 2019, 00:22
Replies: 12
Views: 344
Posted By jimbob
Not familiar with the Amiga test kit, I have a...

Not familiar with the Amiga test kit, I have a DiagROM chip which iirc has a CIA timing test, will try it out. Thanks.
Forum: support.Hardware 23 October 2019, 23:22
Replies: 12
Views: 344
Posted By jimbob
A600 Right mouse button fault

Hello, got an odd problem with an A600 here. In short the right mouse button either doesn't work at all or occasionally sort of works but seems to have a delay between pressing it and detection.

...
Forum: OT - Technical 02 August 2019, 02:15
Replies: 4
Views: 491
Posted By jimbob
35°C is probably a figure used as an upper limit...

35°C is probably a figure used as an upper limit for ambient temperature when specifying the cooling requirements for any device. Chips etc will work perfectly at much higher temperatures but if the...
Forum: support.Hardware 26 March 2018, 20:57
Replies: 0
Views: 302
Posted By jimbob
A1200 Rev1A, NTSC switch?

Hello, can any anyone tell me if this photo shows something normal for a rev1A A1200.

Q201 is in the NTSC/PAL switch circuit of the video encoder but has been left out here and the pads jumpered...
Forum: support.Hardware 14 March 2018, 01:50
Replies: 4
Views: 426
Posted By jimbob
Audio circuit has a +ve and -ve power supply....

Audio circuit has a +ve and -ve power supply. C304 is probably correct as you have it, plus terminal to ground and minus terminal to -ve supply.

Don't take my word for it though, check the...
Forum: request.Apps 03 March 2018, 17:50
Replies: 2
Views: 565
Posted By jimbob
ADF in the zone. Mine is badged differently but...

ADF in the zone. Mine is badged differently but looks like the same device.
Forum: Retrogaming General Discussion 07 August 2017, 22:26
Replies: 43
Views: 3,370
Posted By jimbob
Mine has a not too shabby at all really mono...

Mine has a not too shabby at all really mono input and single speaker. I guess most of the Sony ones are the same. Fine for A600/A1200/CD32 with a single connector and ok for A500 with a simple...
Forum: support.Hardware 01 August 2017, 23:41
Replies: 10
Views: 1,107
Posted By jimbob
That is good news, a fault which goes away after...

That is good news, a fault which goes away after some time when powered up is a good sign of very tired capacitor(s). You may or may not have already got the main culprit, but either way a full recap...
Forum: support.Hardware 30 July 2017, 12:11
Replies: 10
Views: 1,107
Posted By jimbob
Yes, make sure the cable is good first, next load...

Yes, make sure the cable is good first, next load up a paint program program or just the workbench palette editor and play with the RGB sliders. This should tell you if the green signal is totally...
Forum: Coders. Asm / Hardware 26 May 2017, 21:02
Replies: 14
Views: 1,462
Posted By jimbob
Anyone know how the software switch for the audio...

Anyone know how the software switch for the audio filter works, and is it different on different models?

Reason being, whilst running the Sanity Arte demo on an A1200, I pressed and held the right...
Forum: support.Hardware 21 May 2017, 01:45
Replies: 12
Views: 771
Posted By jimbob
PM me your address and I'll stick one in the post...

PM me your address and I'll stick one in the post for you.

I'm a bit surprised that the cap value just drifting by that amount caused the gross fault you had. Did you measure it's DC resistance...
Forum: support.Hardware 14 May 2017, 13:04
Replies: 10
Views: 813
Posted By jimbob
Not sure about that 2.9V, I had the number 2.1V...

Not sure about that 2.9V, I had the number 2.1V in my mind but I'd have to check.

I'd be about 80% sure you have a faulty U12 at this point. Before replacing it though , you should check the...
Forum: support.Hardware 13 May 2017, 00:46
Replies: 10
Views: 813
Posted By jimbob
I think wonky references to the video encoder...

I think wonky references to the video encoder could cause this. Check carefully the circuits to pin 13 and 14 of U12. Double check your replacement C459 and C460.

From memory Vref on pin14 should...
Forum: support.Hardware 01 March 2017, 23:08
Replies: 12
Views: 1,306
Posted By jimbob
Generally just live with it but I did try a...

Generally just live with it but I did try a proper repair on my main A600. Light brass plate/foil, the heaviest guage than you can shape easily enough, epoxy glue and clamp the snapped pieces back in...
Forum: support.Hardware 03 February 2017, 20:01
Replies: 22
Views: 2,063
Posted By jimbob
This could just be a faulty switching jack on the...

This could just be a faulty switching jack on the left channel, may just need cleaned if you are lucky. If you're unlucky the caps have eaten a trace. Mixing the channels when only one cable is...
Forum: Retrogaming General Discussion 30 January 2017, 21:57
Replies: 13
Views: 1,676
Posted By jimbob
Haha, seems that I cannot read! I thought you...

Haha, seems that I cannot read! I thought you were talking about Heimdall 2.
Forum: Retrogaming General Discussion 30 January 2017, 21:31
Replies: 13
Views: 1,676
Posted By jimbob
Hrmm, there is a three part preview in The One....

Hrmm, there is a three part preview in The One. At the end of the third part they promise an exclusive demo level and a competition in the April 94 issue. There is a demo but I don't see the...
Forum: News 30 January 2017, 21:25
Replies: 7
Views: 2,897
Posted By jimbob
Is this a fact or speculation? I realise it's...

Is this a fact or speculation? I realise it's unlikely as the data is probably long lost and in an obscure format if it does exist, but what made me wonder was that the A1200 includes the internal...
Forum: News 30 January 2017, 01:00
Replies: 7
Views: 2,897
Posted By jimbob
amigapcb.org/

I don't know who made this but it was linked in a couple of threads and it is totally awesome and deserves a thread for recognition -

http://amigapcb.org/

Click the link to the beta for more...
Forum: support.Hardware 30 January 2017, 00:52
Replies: 7
Views: 908
Posted By jimbob
Have to leave this one aside for the moment. ...

Have to leave this one aside for the moment.

Freezer spray made no difference once the machine is up and running. I'm not gonna try using it on cold boots as the fault is not 100% repeatable and...
Forum: Retrogaming General Discussion 30 January 2017, 00:49
Replies: 13
Views: 1,676
Posted By jimbob
This rings a faint bell to me but I could be...

This rings a faint bell to me but I could be imagining it :crazy. Maybe The One or CU Amiga? Those were the mags I usually had.
Forum: support.Hardware 30 January 2017, 00:42
Replies: 11
Views: 1,468
Posted By jimbob
Not exactly true. Both these boards are rev8a...

Not exactly true. Both these boards are rev8a A500+, same code numbers for the artwork etc but as you can see the one on the right has the layout error corrected so the parts are inserted as per the...
Forum: support.Hardware 27 January 2017, 00:10
Replies: 7
Views: 908
Posted By jimbob
Thanks Zetr0, the solder side of this board looks...

Thanks Zetr0, the solder side of this board looks really good. Nothing to see under my normal magnifier but under my wee hand held microscope, it's hard to tell, then nearly every single joint has...
Forum: support.Hardware 26 January 2017, 03:06
Replies: 7
Views: 908
Posted By jimbob
PSU is not a standard Amiga one, it is an...

PSU is not a standard Amiga one, it is an industrial type thing I keep for testing. Works great on lots of other Amigas so I think it is solid.

I am thinking of changing the two main filter caps...
Forum: support.Hardware 26 January 2017, 02:10
Replies: 7
Views: 908
Posted By jimbob
A500, cold boot gurus?

I have almost fixed an A500 which came to me dead but it has a niggling fault remaining which I'd like to track down given the damage that had previously been done somehow.

First the symptoms -
...
Forum: support.Hardware 22 December 2016, 03:06
Replies: 13
Views: 1,343
Posted By jimbob
I would say it is normal to hear low level...

I would say it is normal to hear low level digital rubbish during many types of activity on the amiga, mouse movement, heavy screen updates, and particularily disk activity and it will be especially...
Forum: support.Hardware 07 December 2016, 03:35
Replies: 7
Views: 1,133
Posted By jimbob
Got the bastard! Turned out to be a ceramic...

Got the bastard! Turned out to be a ceramic decoupling cap at the video DAC. Freeze spray worked a treat, it was very obvious which component was cooking itself when it got a dose.

Everything...
Forum: support.Hardware 04 December 2016, 23:59
Replies: 7
Views: 1,133
Posted By jimbob
Had a good hunt for this and still no luck....

Had a good hunt for this and still no luck. Before I start lifting components one by one I might try this -

1. Something on the board is broken and gives ~20 ohms between 5v and ground.

2. 5V...
Forum: support.Hardware 04 December 2016, 23:46
Replies: 4
Views: 951
Posted By jimbob
If you haven't got them, great redrawn schematics...

If you haven't got them, great redrawn schematics are here -

http://www.amigawiki.de/doku.php?id=en:service:schematics

You'll want to look first at the the pages on Video out and Lisa.

As...
Forum: OT - Gaming 03 December 2016, 18:38
Replies: 838
Views: 127,074
Posted By jimbob
I have a GOG key for Shadowrun: Dragonfall -...

I have a GOG key for Shadowrun: Dragonfall - Director's Cut. PM if you want it.

EDIT: Taken.
Forum: support.Hardware 30 November 2016, 01:49
Replies: 7
Views: 1,133
Posted By jimbob
Good idea, hoped I would be able to at least...

Good idea, hoped I would be able to at least isolate an area of the board but I didn't manage to find any clues. I have an LCR meter which is a bit more accurate than my cheapo multimeter but I...
Forum: support.Hardware 28 November 2016, 22:50
Replies: 7
Views: 1,133
Posted By jimbob
Weird fault on A1200, how to find it?

I have an A1200 here which seemed to be working properly after a recap except the keyboard wasn't working. No keys worked and the caps lock light would flash three times every so often. I then...
Forum: support.Hardware 22 October 2016, 23:59
Replies: 6
Views: 759
Posted By jimbob
Is this a different diagnostic ROM from the one...

Is this a different diagnostic ROM from the one you have?

http://www.diagrom.com/

Looks very useful for a partially booting board. (oh, a new version announced as I posted -...
Forum: support.Hardware 24 September 2016, 17:11
Replies: 13
Views: 1,260
Posted By jimbob
I wouldn't bother with the piggy back chip RAM...

I wouldn't bother with the piggy back chip RAM mod. It would be different if 1MB cards were unavailable or it freed the connector for another use but as it is, not worth it.

It's a slightly tricky...
Forum: Nostalgia & memories 19 September 2016, 22:21
Replies: 30
Views: 4,449
Posted By jimbob
Galahad, you've been a naughty boy and must be...

Galahad, you've been a naughty boy and must be punished. We're gonna lock you up in the cupboard under the stairs. ;)
Forum: support.Hardware 19 September 2016, 00:53
Replies: 5
Views: 731
Posted By jimbob
I'm sure your right, proper grounding and it's...

I'm sure your right, proper grounding and it's potential problems are a bit mysterious to me.

Anyway, I wired it up properly this time and it works fine. There is a some slack inside the shell...
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