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Forum: Hardware mods Today, 02:40
Replies: 83
Views: 5,456
Posted By rvctech
To repair that cable, I'd try to use a conductive...

To repair that cable, I'd try to use a conductive paint. It's not really something that can be soldered. But probably not worth the trouble if you can get a replacement.

The A600 came with...
Forum: Hardware mods Today, 02:08
Replies: 83
Views: 5,456
Posted By rvctech
Hi Ceason, I think there would be variation...

Hi Ceason,
I think there would be variation between heads from different drives depending on the manufacturer, so probably not possible to do.

It might be possible though if you found a PC drive...
Forum: Hardware mods Yesterday, 15:06
Replies: 83
Views: 5,456
Posted By rvctech
Yes worth trying with not much else to lose. I...

Yes worth trying with not much else to lose. I would suggest to also check that the motor rotates smoothly and freely when you spin it with your hand (and no disk is inserted). The drive will...
Forum: Hardware mods Yesterday, 01:34
Replies: 83
Views: 5,456
Posted By rvctech
It's rare for the heads to die unless you see...

It's rare for the heads to die unless you see signs of physical damage. What happens if you try to format a disk and read it back in the same drive? Does the drive shaft motor spin smoothly and...
Forum: Hardware mods 26 May 2020, 01:32
Replies: 83
Views: 5,456
Posted By rvctech
Electrically you can use almost any Amiga drive...

Electrically you can use almost any Amiga drive with it (except for the ones used in the ESCOM Amigas which are modified PC drives) but mechanically it's a bad fit because the A600 has it's own...
Forum: Hardware mods 21 May 2020, 05:22
Replies: 83
Views: 5,456
Posted By rvctech
Hi Ceason, There are a few subtle...

Hi Ceason,

There are a few subtle differences between revision 1.5 and 2A/B. In particular the Rev 2 doesn't support the old Rev 1 Gayle (it has no place for the work-around PAL/GAL).

This is...
Forum: Hardware mods 12 May 2020, 05:30
Replies: 83
Views: 5,456
Posted By rvctech
:shocked.. OK that definitely sounds like it is...

:shocked.. OK that definitely sounds like it is damaged beyond repair!

I strongly recommend that you install PLCC sockets on your replacement board for all PLCC ICs. These parts need to be spared...
Forum: Hardware mods 12 May 2020, 04:05
Replies: 83
Views: 5,456
Posted By rvctech
What I meant is that I have looked at Rev 1.5,...

What I meant is that I have looked at Rev 1.5, Rev 2B and Rev 2D mainboards and I can see that the values of certain EMI components do differ. Quality plays no part in this, but cost reductions...
Forum: support.Hardware 12 May 2020, 03:32
Replies: 37
Views: 31,491
Posted By rvctech
Although you are able to communicate with the...

Although you are able to communicate with the FPGA via JTAG, the part could still have for example cracked solder joints. There may also be other issues with the board. Perhaps the installation of...
Forum: Hardware mods 17 April 2020, 02:34
Replies: 349
Views: 34,310
Posted By rvctech
Yes I bought 2 from him a few months ago (1 of...

Yes I bought 2 from him a few months ago (1 of which I immediately used to repair a CD32). I did not consider them to be very cheap :). He had only a limited amount left, and I don't think there are...
Forum: Hardware mods 15 April 2020, 11:16
Replies: 349
Views: 34,310
Posted By rvctech
Someone in Germany already used this approach to...

Someone in Germany already used this approach to make an Amiga in a different form factor.

To be honest I consider any CD32 derivative design to be a waste of the last few remaining Akiko chips in...
Forum: Hardware mods 15 April 2020, 02:58
Replies: 349
Views: 34,310
Posted By rvctech
I don't think it's a matter of faith. The A600...

I don't think it's a matter of faith. The A600 requires very good soldering and technical skills to assemble and debug. Laying it out is only the first step. It's also quite hard to find certain...
Forum: Hardware mods 14 April 2020, 02:14
Replies: 349
Views: 34,310
Posted By rvctech
U49 is a reset supervisor, but on a Rev 2D that I...

U49 is a reset supervisor, but on a Rev 2D that I looked at, the part isn't even loaded! Looks like it was an option Commodore considered.

The boards are definitely not 4-layer. I have some A600...
Forum: Hardware mods 09 April 2020, 02:55
Replies: 349
Views: 34,310
Posted By rvctech
This was the case for the original attempt which...

This was the case for the original attempt which you are working on.

However Mick abandoned that version and started again with an import of the Rev 2A Gerbers that were generated from...
Forum: Hardware mods 31 March 2020, 01:43
Replies: 349
Views: 34,310
Posted By rvctech
You ultimately chose not to use PLCC sockets?

You ultimately chose not to use PLCC sockets?
Forum: Hardware mods 24 March 2020, 22:26
Replies: 83
Views: 5,456
Posted By rvctech
AmigaPCB used Commodore's original Gerber files,...

AmigaPCB used Commodore's original Gerber files, since these files have no information about components in them, they definitely would have had to take the information from a BOM or later revision as...
Forum: Hardware mods 28 February 2020, 10:39
Replies: 83
Views: 5,456
Posted By rvctech
Yes I saw that too, but I don't use Kicad :lol....

Yes I saw that too, but I don't use Kicad :lol. Does it even work? Quite a few of these obscure third party extensions that I looked at in Inkscape, end up not being maintained or are broken (there...
Forum: Hardware mods 28 February 2020, 07:54
Replies: 83
Views: 5,456
Posted By rvctech
I took a look at PCBModE at the time, and for...

I took a look at PCBModE at the time, and for some reason I wasn't happy with the result or I could not get it to work :confused. I will look at it again!
Forum: Hardware mods 27 February 2020, 22:10
Replies: 83
Views: 5,456
Posted By rvctech
Hi CD32Freak, Ghostscript is used to...

Hi CD32Freak,



Ghostscript is used to process PostScript (PS) files, a precursor to PDF files. Unfortunately I don't think it is much use for SVG -> Gerber (in my process I don't convert to...
Forum: Hardware mods 27 February 2020, 13:35
Replies: 83
Views: 5,456
Posted By rvctech
My mistake, I meant one of the joystick connector...

My mistake, I meant one of the joystick connector pads is missing (see attached screenshot from AmigaPCB - not sure if CD32Freak might've already fixed this in his Gerbers). Looks like you fixed it...
Forum: Hardware mods 27 February 2020, 10:54
Replies: 83
Views: 5,456
Posted By rvctech
Hi Mick, I use Altium (my tool of the trade)....

Hi Mick,
I use Altium (my tool of the trade). In theory I can do some checks on the PCB (such as antenna tracks that lack vias) but I can't do this until I do some more work on the PCB/schematic...
Forum: Hardware mods 27 February 2020, 10:43
Replies: 83
Views: 5,456
Posted By rvctech
Hi CD32Freak, Some of those tracks that you...

Hi CD32Freak,

Some of those tracks that you have highlighted are running on the bottom layer, not the top.

I think the "x-ray" layer is a visualisation tool for showing where a particular net...
Forum: Hardware mods 26 February 2020, 22:41
Replies: 83
Views: 5,456
Posted By rvctech
Hi CD32Freak, When I did my own conversion...

Hi CD32Freak,

When I did my own conversion of the SVG data to my CAD package, I saw these. They are not really "hidden" GND tracks. They are just a relic from when the PCB was designed by...
Forum: Hardware mods 16 February 2020, 22:18
Replies: 45
Views: 5,155
Posted By rvctech
The CD32 depends on increasingly rare and...

The CD32 depends on increasingly rare and hard-to-find custom chips and other unique parts. One also needs the custom optical drive.

Unless one is transferring parts from a "dead" board, there is...
Forum: Hardware mods 16 February 2020, 09:32
Replies: 45
Views: 5,155
Posted By rvctech
Clarification (I made a typo) - *Inner plane*...

Clarification (I made a typo) - *Inner plane* layers are always inverted :).

(Inner signal layers are plotted in the normal manner).
Forum: Hardware mods 15 February 2020, 23:54
Replies: 45
Views: 5,155
Posted By rvctech
@Mick My 2c AUD: A lot of internal Commodore data...

@Mick My 2c AUD: A lot of internal Commodore data that we have was leaked and/or taken by ex-employees of Commodore and/or ESCOM.

Normally it is against company policy to leak or take proprietary...
Forum: Hardware mods 15 February 2020, 21:53
Replies: 9
Views: 1,137
Posted By rvctech
There is no 1D4 on AmigaPCB.org

There is no 1D4 on AmigaPCB.org
Forum: Hardware mods 15 February 2020, 03:00
Replies: 349
Views: 34,310
Posted By rvctech
I was more referring to the custom chips, not the...

I was more referring to the custom chips, not the CPU.

Cutting the bottom off a PLCC socket makes it easier to solder by hand for prototypes. It weakens the socket but it's acceptable for a...
Forum: Hardware mods 15 February 2020, 00:03
Replies: 349
Views: 34,310
Posted By rvctech
I've never had reliability issues with PLCC...

I've never had reliability issues with PLCC sockets that are correctly soldered. It would be a shame to solder down custom chips if you need to remove them later.

You probably already know this -...
Forum: Hardware mods 14 February 2020, 23:46
Replies: 349
Views: 34,310
Posted By rvctech
Hi Mick, Have you ever seen an A600 Rev 2A...

Hi Mick,

Have you ever seen an A600 Rev 2A publically released? I've been wondering whether there was something wrong with it, because the earliest Rev 2 that I can can see anywhere is Rev 2B.
...
Forum: Hardware mods 14 February 2020, 23:15
Replies: 45
Views: 5,155
Posted By rvctech
Hi CD32freak, You probably already know this...

Hi CD32freak,

You probably already know this (I am late to the party) - in a Gerber file, *inner plane* layers are always inverted. The layer plot shows where copper does *not* appear

(The...
Forum: Hardware mods 14 February 2020, 23:01
Replies: 25
Views: 2,189
Posted By rvctech
Hi CD32Freak, Good work, I also re-generated...

Hi CD32Freak,

Good work, I also re-generated the A600 PCB using the data on AmigaPCB.org during my Christmas holidays to see if it 'was possible'. I used a slightly different technique which does...
Forum: Hardware mods 14 February 2020, 22:43
Replies: 25
Views: 2,189
Posted By rvctech
Where have you seen the original schematic files?...

Where have you seen the original schematic files? I have looked around for years for these, as a curiosity. Are they still around?
Forum: Hardware mods 14 February 2020, 22:37
Replies: 83
Views: 5,456
Posted By rvctech
The AmigaPCB data has the A600 as a 4-layer...

The AmigaPCB data has the A600 as a 4-layer board, perhaps Commodore was thinking of doing this or perhaps it's an error on AmigaPCB. In reality it's a 2-layer board.
Forum: Hardware mods 28 January 2020, 12:54
Replies: 349
Views: 34,310
Posted By rvctech
@torsti76 No offence taken or intended at all...

@torsti76 No offence taken or intended at all :great

In the case of the A600, we can confidently guess that damage is almost always caused by unskilled recap attempts. In my experience leaking...
Forum: Hardware mods 28 January 2020, 08:11
Replies: 349
Views: 34,310
Posted By rvctech
I've read the thread carefully indeed, and you...

I've read the thread carefully indeed, and you may have noticed that I provided some (basic) support in prior posts?

Due to the age and rarity of any Amiga, there is very little excuse for...
Forum: Hardware mods 28 January 2020, 07:37
Replies: 349
Views: 34,310
Posted By rvctech
Take parts off of a dead machine? Use loose parts...

Take parts off of a dead machine? Use loose parts that were spares to start with?

What's the point of making a new one, if you killed a working one? :crying

<rant>
This is a nasty side effect...
Forum: Hardware mods 27 January 2020, 21:20
Replies: 349
Views: 34,310
Posted By rvctech
You killed a perfectly working A600 for this?

You killed a perfectly working A600 for this?
Forum: Hardware mods 10 January 2020, 10:08
Replies: 349
Views: 34,310
Posted By rvctech
The value of EMI components is generally not...

The value of EMI components is generally not super critical and generally you might not even load them to start with unless they were involved in something important (i.e clocks, bus, reset, etc).
...
Forum: Hardware mods 09 January 2020, 13:42
Replies: 349
Views: 34,310
Posted By rvctech
I'm not sure if that is correct. From my...

I'm not sure if that is correct.

From my reading of the schematic, _RST is generated by GAYLE, and this depends on the signal _KB_RESET which is an input to GAYLE. The _RST signal is the...
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