Additional clockports for the A1200 ?

[Sparky]

Hi there,

Is there anyway to connect more than one one device to the clockport of the A1200 ?

I'd like to connect up a soundcard AND and Subway USB device ?

I seem to remember that there was a widget around that would allow it.

Any ideas ?

Thanks!

[cgutjahr]

Is there anyway to connect more than one one device to the clockport of the A1200 ?

Yes. RMB Digitaltechnik once sold the "Quadroport", a device that connects to the clockport (via a ribbon cable IIRC) and provides four clockports.

Note that RBM left the Amiga market ages ago - I don't think they are still able to supply such a device. Good luck locating it on ebay

[Matt_H]

Most Individual Computers boards have additional clockports on them. You'll need Zorro slots, though. I don't think they can be daisy-chained.

The Z-IV Zorro busboard has more clockports on it as well.

[leirbag28]

@Sparky


The same device I told you about that plugs into the A600 clockport, also plugs into the A1200 one.............its called the Quaddddraport, spelled just like that. it gives you four more ports I think.  I myself am looking for one Badly.

 I want my A600 to explode from all the Power inside! I am planning on destroying the Universe with this little machine! hehehe

[Brian]

One need to remember that the Q.port only support some clockport hardware, I'm doubtfull if the subway is supported.

[platon42]

Actually, the Quaddddroport is supported in the Subway driver -- but I never have tested it and AFAIK never got reports back from users.

And no, clockport cards cannot be chained -- there are only four address lines (!) and 8 datalines creating a mere address/register space of 16 bytes. The subway needs all of them to operate. Clockport cards are some kind of magic

The only exception to this chaining was the Melody soundcard, which can be chained with a Twister serial port (the cards would share the address space). But it will only work exactly this way and no other.

Ah yes, the following Zorro card clockports are supported by the Subway:

/* Highway */
/* Unity Prototype CP 0 */
/* Unity Prototype CP 1 */
/* X-Surf CP 0 */
/* X-Surf CP 1 */
/* ISDN-Surfer */
/* VarIO */
/* Buddha flash */
/* Kickflash */ (the last one only the next release of the driver)

[Sparky]

What this space!

Someone very skilled in electronics, who we've all probably got something from, "might" be doing something most generous about this :-)

I'll post up more info later if it happens.

[Stedy]

A clockport device can only reside at these addresses, nothing else:

$D80001, $D80005, $D80009, $D8000D, $D80011, $D80015
$D80019, $D8001D, $D80021, $D80025, $D80029, $D8002D
$D80031, $D80035, $D80039, $D8003D

Whilst you could generate more by perhaps multiplexing the 8 data bus pins, you would break existing software drivers.

Also bear in mind that the maximum, theoretical, throughput of the clockport is 2.8 MByte/sec but is is CPU not DMA driven.

[platon42]

@Steady:
While this is valid for the original A1200 clockport, zorro clockports have the same address offsets, but with a different base and often use faster timings. This no problem for most clockport devices. And nearly all of them at least support one of the zorro clockport cards -- hacking them into using a different one with different base is very simple then. The Quaddddroport uses the same addresses as in the original A1200, but has three additional clockports at 0x4000 offsets.

[Doobrey]

AFAIK, the Z-IV busboard uses the same offsets for it`s clockports too.
 It`s a simple 1 chip job to generate these new chip selct signals, although you can`t build it on stripboard cos the clockport headers are 2mm pitch instead of 0.1". So you`ll have to either get your own PCB made, or hack it into a 2mm IDC cable!

[Sparky]

:-)  Instructions on how to build your own clock port expander have just appeared in my in-box  :-)

I'll see if I can turn them into a schematic and then take things from there.

Some people in the Amiga community are top notch  :-D

[joetee]

"The same device I told you about that plugs into the A600 clockport, also plugs into the A1200 one"

The A600 does not have a "ClockPort".
Both A6 and A12 have expansion ports.
Niether 2 Layer European nor the 4 Layer American A600 PCB's have Clockports.
Perhaps you meant another HW product that fit over a PLCC chip?

Please elaborate...

...and YOU with the schematics in the INBOX: Share-em!!  

[Sparky]

...and YOU with the schematics in the INBOX: Share-em!!  

I intend too, just need to get a nice schematic done and get them QA'd .. then up on Aminet they go :-)

[CD32Freak]

[idiot-mode]
The A1200 revision 1A has two clockports and the extra port is located at P9A near the keyboard connector on the right
[/idiot-mode]
:lol:
Post Edited, see below :-D

[mboehmer_e3b]

The A1200 revision 1A has two clockports and the extra port is located at P9A near the keyboard connector on the right

Wrong. Sorry. It is the normal expansion header for memory which was only present in early revision machines.
Don't even try to connect clockport devices there!

Please read the SUBWAY manual to get more information on this issue.

Michael