CSPPC & A3000 desktop?

[Castellen]

I've been working on lots of new HTML technical guides and stuff for the site, and while I haven't intended them to be released just yet, I've made these two accessable here:

http://amiga.serveftp.net/A3000INT_2/a3000_INT2_mod.html

That's the HTML version of the same guide, re-written slightly and tidied up.


A3000 technical hardware guide here, I've converted it to HTML and tidied it up a bit:

http://amiga.serveftp.net/A3000_HardwareGuide/main.html


They will probably contain a few broken links at the moment, so don't complain :-P


Lots more information to come including slightly better site navigation, guides on A4000D audio repair (capacitor replacement, etc), guides on SMD soldering, and more.
New changes should go live in about a week if things go well.

[Castellen]

My apologies, try this:
http://amiga.serveftp.net/A3000-INT_2/a3000_INT2_mod.html

Should work now.
As you can see I'm in the process of sorting it all out properly... :whack:

[Castellen]

Thanks, glad to hear you're finding it useful   :-)
I wrote that after working out how to do it myself, thinking there wasn't any documentation on it, then afterwards found a web page on it...

Anyways, the new HTML version should be even easier to use now, with in-document images and the likes.

If you have any suggestions/requests for new amiga (repair/faultfinding) guides, let me know.
Might have to get more creative with replacement floppy drives one of these days.  Anyone know where I can find protocol/timing details of the Amiga floppy drive control signals??

[Castellen]

Patrik: Thanks for the suggestion.  I've looked in there already and couldn't find the information I needed.  I have the Amiga Hardware Reference Manual 5th printing 1988 edition.  It only contains basic descriptions of the floppy control pins, but lots of details on the system registers and addresses.
Do other editions of the manual have the details you mention?  Any chance the book might accidentally fall into your scanner at the correct page? :-)

I might have to "borrow" the logic analyser from work...


Argus: Good idea, that would be worth documenting.  Haven't done so much with the A1200s, mainly been the "big box" Amigas, so I'll have to do some research.

[Castellen]

Don't forget you can access the Cyberstorm early setup menu by holding down the Esc key during power up/reset.  You can set many SCSI parameters, memory speed access, etc.
Make sure you use the correct cable and terminations.


Not sure about the Spitfire cards, if they do DMA (direct memory access), you'll need Buster rev 11 to support this.


With motherboard SCSI termination, it's fairly simple:

- If there is nothing plugged into the rear panel DB25 external SCSI connector, then fit the motherboard resistor packs beside the SCSI connector.  Or you can fit a DB25 active terminator directly to the external SCSI connector.

- On the internal SCSI cable, you want termination enabled on the device at the very end of the cable, all devices in between (if any are fitted) should have termination disabled.

-  If you have ultra-wide SCSI devices fitted using a 50 to 68 pin adaptor, you probably have to enable termination on that device, even if it's in the middle of the cable.

- The termination power supplied from the A3000 motherboard often had a fault.  Diode D800 can sometimes be open circuit, or mounted in the PCB backwards.  Check for 5V at pin 25 of the external SCSI connector at the back to make sure the diode is OK.  Device termination may not function correctly if there is no termination 5V supplied from the motherboard.