A1200 REV2B pictures or info wanted

[Animagic]

I am interested in buying an A1200 REV2B mobo I found in amibench.

I really have no idea if this mobo is any different to my existing A1200 computers, so I'm searching for some information, like pics or tech data.

I allready checked google and yahoo, but no results.

Does anybody have a REV2B mobo?

If so, please send me some pics, or just write me about the differences with the older mobos.

Thanx  :-)

[Mad-Matt]

some pictures here :-

Amiga Hardware

And also some info here :-

Eyetech

[Animagic]

Thanx Mad-Matt !

[fragment]

Animagic wrote:
Does anybody have a REV2B mobo?

Here's mine with the patches discussed before..

[Ryu]

I have what I think is a 2B mobo... without looking, but it has all the hardware fixes carried out on it... and im selling it :-)

[Stedy]

@ Fragment

Here's mine with the patches discussed before..

Could I use that Mobo picture for a tech note on A1200 motherboard fixes?

Your board has the PCMCIA fix, timing fixes and something to do with Paula I can not work out.

@Animagic

The REV 2B board had a few timing bugs that needed to be fixed so that it worked with all A1200 accelerators.

Ian

[fragment]

Stedy wrote:
Could I use that Mobo picture for a tech note on A1200 motherboard fixes?

Sure, go ahead  :-) There are links to closeups on another thread.

[Radfoo]

I bought a 2B fixed motherboard from Eyetech, but the only mods I can see are connected around the PCMCIA slot.  Is there anyway of checking if my 2B board is a later one that does not need the extra fixes?

The board works fine when it boots up, but I sometimes need to do ctrl+a+a a few times to get it to boot. I have tested with different PSU, IDE buffer and scandoubler to try and fix the problem. The only items not swapped are the keyboard adapter and an apollo 040.

Any ideas :-?

[Panthro]

I got  a A1200 rev 2b I know it was fixed by my local
Amiga supplyer MVB here in vic and I thought it was just a timing problem + the trap door expandtion issue dunno about the pcmcia slot having said that it worked fine with my PPC +Bviz  along side my LAN card in the slot. possibly the timeing affects the pcmcia slot???

[Stedy]

@ Radfoo

http://www.haigh1.freeserve.co.uk/Apollo_crashing.htm

All rev 2B boards need a mod. I'm surpised your Apollo 040 works well with yours, mine did not.

The boot up problem, have you cut pin 1 of the IDE cable?

[Animagic]

Thanx to all of you.

Ryu - I have what I think is a 2B mobo... without looking, but it has all the hardware fixes carried out on it... and im selling it

Mail me!

Another question coming up: I want to put an accereraton board (a 030 or 040 board - DEFINATELY A BLIZZARD), does anybody know if Blizzards work ok with Rev2B ?

Thanx again.

[Radfoo]

[Stedy]

Hello,

The main modification for the timing fix is to remove 2 resistors from the underside of the PCB see

A1200 timing fix pic

Note: This pic has the resistors in place, another one has them removed (writing a guide ATM).

[fragment]

A1200 timing fix pic

Too bad your server doesn't like direct linking to pics  :crazy:

[Stedy]

Grr stupid IE6! Works with Netscape.

Try http://www.ianstedman.co.uk/Downloads/A1200-timingfix2.jpg