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Forum: Hardware mods Today, 05:10
Replies: 13
Views: 719
Posted By A4000Bear
It would be nice if any of these re-made boards...

It would be nice if any of these re-made boards incorporated some simple upgrades, such as using a SIMM instead of ZIP RAM, and increasing the memory to 16MB as outlined here:...
Forum: support.Hardware 08 March 2020, 14:40
Replies: 12
Views: 961
Posted By A4000Bear
Most people these days fit a CR2032 non...

Most people these days fit a CR2032 non rechargeable battery with a series diode to prevent charging. These are far less likely to leak than the old NiCd batteries.

Some information here, showing...
Forum: support.Hardware 20 February 2020, 12:38
Replies: 24
Views: 1,056
Posted By A4000Bear
Looks like your problem is misadjustment of the...

Looks like your problem is misadjustment of the purity magnets that are located on the deflection yoke on the CRT. They may have been bumped in transit.


It is easy to fix - if you know what you...
Forum: support.Hardware 05 July 2019, 06:29
Replies: 16
Views: 738
Posted By A4000Bear
I would expect the CPU to get hot, yours is an...

I would expect the CPU to get hot, yours is an early version 60 Mhz 060 overclocked to 66 MHz. It would be wise to attach a heatsink to the CPU, or you could change the oscillator to 60 MHz (or even...
Forum: support.Hardware 20 November 2018, 13:53
Replies: 19
Views: 2,013
Posted By A4000Bear
This is a common problem caused by battery...

This is a common problem caused by battery leakage damaging some of the TTL logic chips that controls the fast RAM. I have repaired a few A4000s with this problem. If my memory serves me correctly,...
Forum: support.Hardware 22 October 2018, 15:04
Replies: 26
Views: 1,863
Posted By A4000Bear
I have three A4000 motherboards, all modified for...

I have three A4000 motherboards, all modified for 64MB and two A4000 Warp Engines. All work perfectly together.
Forum: support.Hardware 29 June 2018, 07:24
Replies: 17
Views: 1,093
Posted By A4000Bear
What version is your gvpscsi.device? You can find...

What version is your gvpscsi.device? You can find out by looking at what is printed on the sticker on top of the ROM or by typing in 'version gvpscsi.device' (without quotes).

Latest version is...
Forum: support.Hardware 18 June 2018, 15:51
Replies: 21
Views: 11,570
Posted By A4000Bear
Many years ago I made a TV test pattern generator...

Many years ago I made a TV test pattern generator from an A1200 motherboard. I needed to get extreme overscan to get an accurate representation of a PM5544 pattern, in excess of overscan normally...
Forum: support.Hardware 17 May 2018, 16:33
Replies: 11
Views: 1,188
Posted By A4000Bear
That is correct. As your A2000 is originally...

That is correct. As your A2000 is originally NTSC, you already have the appropriate 28.6 MHz oscillator installed (PAL is 28.3). Your video toaster should work as well as it does now, once you select...
Forum: support.Hardware 16 May 2018, 15:34
Replies: 11
Views: 1,188
Posted By A4000Bear
As you have probably noticed, there is a...

As you have probably noticed, there is a bewildering assortment of different Agnus versions. Here is a good list of the different versions, translated from a French website....
Forum: support.Hardware 14 May 2018, 15:04
Replies: 32
Views: 5,483
Posted By A4000Bear
OS 3.9 HD toolbox fails with or without the...

OS 3.9 HD toolbox fails with or without the onboard terminators. There are no external devices, however, I no longer get the recoverable alerts now that the onboard terminators are removed. If I...
Forum: support.Hardware 07 May 2018, 14:08
Replies: 13
Views: 1,319
Posted By A4000Bear
I have the 15" version of that monitor, and the...

I have the 15" version of that monitor, and the VGA does not support 15 Khz. It does not even support 50 Hz vertical refresh, so to use it on an Amiga, you will need to use a scan doubled NTSC mode.
Forum: support.Hardware 03 May 2018, 05:14
Replies: 32
Views: 5,483
Posted By A4000Bear
I have a similar system to that of the original...

I have a similar system to that of the original poster and I found his summary to be excellent.

I didn't realise the combo board had inbuilt SCSI termination, the GVP instructions seemed to be...
Forum: Hardware mods 27 March 2018, 13:03
Replies: 88
Views: 17,088
Posted By A4000Bear
Fantastic work! I can see quite a few people...

Fantastic work! I can see quite a few people wanting one of those.... like me!

It would be great if a few simple updates could be incorporated, such as those already available as hacks to existing...
Forum: support.Hardware 08 February 2018, 13:28
Replies: 12
Views: 1,351
Posted By A4000Bear
You can always try using a LR2032. This is the...

You can always try using a LR2032. This is the rechargeable version of the CR2032. I recently ordered a quantity of them, and plan to give them a try. It should simply be a matter of fitting a CR2032...
Forum: support.Hardware 01 February 2018, 04:01
Replies: 3
Views: 663
Posted By A4000Bear
I'm very aware of those capacitors, having had...

I'm very aware of those capacitors, having had them blow up in numerous electronic items over the years. They can also be found in those IEC mains sockets that contain filters.

The reason they...
Forum: support.Hardware 01 February 2018, 03:48
Replies: 8
Views: 665
Posted By A4000Bear
In order to make an MS-DOS floppy bootable, you...

In order to make an MS-DOS floppy bootable, you need to copy some system files to it.
This is normally done during formatting by adding /S to your format command.

Format A: /S

Incidentally...
Forum: support.Hardware 29 January 2018, 14:04
Replies: 24
Views: 1,354
Posted By A4000Bear
Actually its easier than that. Simply disconnect...

Actually its easier than that. Simply disconnect the red and blue inputs to the circuit, while leaving all component outputs connected. If you want to simulate an amber monitor, disconnect the blue...
Forum: support.Hardware 29 January 2018, 13:25
Replies: 7
Views: 1,310
Posted By A4000Bear
As other people have already indicated, you will...

As other people have already indicated, you will not be able to properly view a 7MHz square wave on a 20 MHz scope.

When a bandwidth is quoted, it is commonly accepted that the frequency response...
Forum: support.Hardware 22 November 2017, 23:40
Replies: 27
Views: 1,942
Posted By A4000Bear
I have a good clear pdf of the Sidecar schematic....

I have a good clear pdf of the Sidecar schematic. Have a look in the zone....
Forum: support.Hardware 19 October 2017, 14:14
Replies: 34
Views: 2,470
Posted By A4000Bear
I noticed the original poster is from Argentina. ...

I noticed the original poster is from Argentina.

They use PAL-N there, it's not exactly the same PAL as used in the rest of the world (PAL B/D/G/K/I).
The difference is in the colour subcarrier...
Forum: support.Hardware 19 October 2017, 13:57
Replies: 12
Views: 1,010
Posted By A4000Bear
If you look carefully, that battery is a NiMh...

If you look carefully, that battery is a NiMh replacement. Looks like someone has already replaced the old battery. NiMH are less likely to leak compared to the old NiCd batteries. The PCB damage...
Forum: support.Hardware 16 October 2017, 14:17
Replies: 1,190
Views: 443,098
Posted By A4000Bear
Actually you are both correct. Vanish laundry...

Actually you are both correct. Vanish laundry booster comes in two varieties. A gel or a powder. The gel contains hydrogen peroxide, the powder contains sodium percarbonate. When water is added, the...
Forum: support.Hardware 18 August 2017, 15:30
Replies: 4
Views: 979
Posted By A4000Bear
Brasso might be a bit too aggressive for cleaning...

Brasso might be a bit too aggressive for cleaning the edge connector contacts. A soft pencil eraser followed by a soft cloth or tissue soaked with methylated spirits usually works well for me.
...
Forum: support.Hardware 26 March 2017, 13:51
Replies: 1,190
Views: 443,098
Posted By A4000Bear
No, as the solution only affects the surface of...

No, as the solution only affects the surface of the plastic, not the internal structure. Some people have claimed it does, but I would be inclined to blame long term exposure to heat and light. The...
Forum: support.Hardware 22 February 2017, 13:06
Replies: 15
Views: 1,613
Posted By A4000Bear
I have an interesting variation on this problem. ...

I have an interesting variation on this problem.

In my case I get no boot, just the insert disk animation on initial power up. Resetting the Amiga still results in no boot. However, if I turn the...
Forum: support.Hardware 17 January 2017, 06:14
Replies: 10
Views: 1,186
Posted By A4000Bear
It was a choice of one of three buffer chips,...

It was a choice of one of three buffer chips, unusually I chose the correct one to replace first, so it was pretty much blind luck!

Removing the old chip and replacing it was easier than I...
Forum: support.Hardware 16 January 2017, 08:44
Replies: 10
Views: 1,186
Posted By A4000Bear
Finally tracked down the problem. U705, a...

Finally tracked down the problem. U705, a 74FCT16245 buffer IC was faulty. I managed to replace it with a lot of careful soldering, and now everything seems to be OK. I'm running a memory check...
Forum: support.Hardware 15 January 2017, 15:10
Replies: 10
Views: 1,186
Posted By A4000Bear
I have tried four different CPU cards, so I think...

I have tried four different CPU cards, so I think I can consider them blameless!

Having said that I had an extremely frustrating day today.

I've been testing the motherboard with a CF card on...
Forum: support.Hardware 14 January 2017, 07:35
Replies: 10
Views: 1,186
Posted By A4000Bear
Hmm...Mine is a Quikpak system too, but I have...

Hmm...Mine is a Quikpak system too, but I have already replaced Bridgette. I'm wondering if it could be U705, U706 and U707. Not looking forward to soldering those. The pins are so fine.
Forum: support.Hardware 13 January 2017, 12:05
Replies: 10
Views: 1,186
Posted By A4000Bear
Thanks for that, I'll download it and give it a...

Thanks for that, I'll download it and give it a try.

Edit: I have tried a new P702 (and also a new P701) but I still have the Zorro problems previously mentioned.
The noise on pin 12 has gone...
Forum: support.Hardware 13 January 2017, 09:40
Replies: 10
Views: 1,186
Posted By A4000Bear
A4000T Zorro problems.

I have an A4000T that has problems with Zorro cards.

Plugging in a Zoram card, which works on other computers gives the infamous red faulty expansion screen on boot up.
A Cybervision 64 card is...
Forum: support.Hardware 26 September 2016, 15:16
Replies: 9
Views: 1,509
Posted By A4000Bear
The 3.1 ROM you have is most likely an EPROM,...

The 3.1 ROM you have is most likely an EPROM, which uses a ceramic package which is a little taller than the plastic package of the original 2.04 ROM. An EPROM has a window under the sticker which...
Forum: support.Hardware 21 April 2016, 15:20
Replies: 11
Views: 1,485
Posted By A4000Bear
The CSPPC has a surface mount 68060 socket, and I...

The CSPPC has a surface mount 68060 socket, and I have found that there are almost always dry solder joints associated with it.

To test for this, try pressing firmly on the top of your 060 chip...
Forum: support.Hardware 19 August 2015, 14:43
Replies: 1,190
Views: 443,098
Posted By A4000Bear
Here are my experiences with retr0brite:...

Here are my experiences with retr0brite: http://members.iinet.net.au/~davem2/overclock/Retrobrite.html

In the article, there is also a link to a very detailed and technical explanation of why it...
Forum: support.Hardware 13 July 2015, 15:28
Replies: 16
Views: 2,152
Posted By A4000Bear
Seems my vague memories of this are getting a bit...

Seems my vague memories of this are getting a bit clearer.

I originally purchased my VXL-30 on it's own.
A little later I purchased the RAM expansion card for it. A set of updated PALs came with...
Forum: support.Hardware 13 July 2015, 15:17
Replies: 27
Views: 5,122
Posted By A4000Bear
I would also add that in the case of the A4000,...

I would also add that in the case of the A4000, it's the 22uF capacitors that are the most prone to leakage. I have also seen two A4000 power supplies with leaking capacitors too.
Forum: support.Hardware 10 July 2015, 16:40
Replies: 16
Views: 2,152
Posted By A4000Bear
That's me.... It was a very long time ago,...

That's me....

It was a very long time ago, and I no longer have the VXL-30, but I have a very vague memory of receiving documentation with my VXL-30 about a PAL update for earlier versions of the...
Forum: support.Hardware 10 April 2015, 15:42
Replies: 13
Views: 1,572
Posted By A4000Bear
Here you go: ...

Here you go:

http://members.iinet.net.au/~davem2/overclock/batt.html
Forum: support.Hardware 03 February 2015, 09:06
Replies: 40
Views: 4,561
Posted By A4000Bear
I had a similar problem with two A4000s several...

I had a similar problem with two A4000s several years ago. Like Voyager, I traced the fault to U891, though in both cases the chip itself was faulty, presumably caused by the battery chemicals...
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