PAK-68/20 - Repository

General discussions or ideas about hardware.
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rubber_jonnie
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Re: PAK-68/20 - Repository

Post by rubber_jonnie » Fri Feb 23, 2018 3:34 pm

redhawk668 wrote:
Fri Feb 23, 2018 2:02 pm
Where did you find the PGA114 socket? I've searched, but they seem really difficult to find. I now have the 68020, the FPU and the GAL's and the PLCC68 socket. That was'nt a big problem to find. Rest of the stuff will be ordered from DigiKey.

If I can't find a 114 PGA socket, I think I will make a socket with SIL socket connectors.
Unfortunately for you :cry: , I got lucky with the sockets. When I bought the board I was sent the CPU socket with it (I'd accidentally been charged too much for postage, the socket was compensation :D ), and I had the FPU socket in a bag in the drawer.

I don't have an FPU yet, but I'm initially going to run without one to remove some complexity. If I can get the damn thing working, then I will add the FPU later.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

redhawk668
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Re: PAK-68/20 - Repository

Post by redhawk668 » Sat Feb 24, 2018 6:11 pm

Well, then.. The GAL's, 68020 CPU and 68882 FPU are on their way, so I'll expect to receive them soon. Also ordered the rest of the needed stuff at DigiKey, so that will also arrive in a few days. So, the only thing I can't find is a PGA114 socket. Bummer, but I have thought of a solution. I am going to use SIL sockets to build a socket. That might as well work too. Next week, I have some time off, I hope my stuff arrives so I can start the build.
Total retro nut, my collection: 1040 STE, TOS 2.06, 4 mb, CosmosEx - 520 STFM, TOS 1.04, 4 mb, Blitter, CosmosEx - 520 STFM, TOS 1.04, 4 mb - 1040 STF, TOS 1.04, 1 mb, Gotek - Amiga 1200 with Blizzard 1220/4 - Amiga 500 + ACA500 - Amiga 500 + TF530, 1 mb chipram hack.

Atari 8 bit: 800XL, stock - 600XL, Ultimate 1 mb, Sophia RGB - 130XE, 320 kb, Sophia RGB

Sinclair stuff: ZX Spectrum Plus - ZX Spectrum 48 kb and self built clones.

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rubber_jonnie
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Re: PAK-68/20 - Repository

Post by rubber_jonnie » Sat Feb 24, 2018 6:49 pm

Good luck redhawk, let us know how you get on.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

guus.assmann
Posts: 58
Joined: Sat Sep 23, 2017 8:52 pm
Location: Ede Netherlands

PAK-68/20 - Repository

Post by guus.assmann » Sat Feb 24, 2018 8:18 pm

Hello,
For me, two of these boards are working.
Both in a Mega ST.
Some complications though. Not all CPU's do work.
And I cannot tell any diffrence between them.
A CPU could work well in anouther 68020 board and not in this one or vice versa.
Also, I needed to replace the LS244 and LS373 by F types.
And for this board the original OS is needed to provide the reset vectors.

Dil sockets do make a very good receptible for the CPU...

Just my experience....

BR/
Guus

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rubber_jonnie
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Re: PAK-68/20 - Repository

Post by rubber_jonnie » Sat Feb 24, 2018 11:49 pm

Thanks Guus, great information and very useful.

My board is built, but I'm waiting on the CPU, ROMs and GALs.

Once they arrive, I'll look at next steps.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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rubber_jonnie
Posts: 308
Joined: Thu Aug 17, 2017 7:40 pm
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Re: PAK-68/20 - Repository

Post by rubber_jonnie » Tue Feb 27, 2018 12:48 pm

So, this is where I'm at right now:
PAK.jpg
PAK.jpg (433.54 KiB) Viewed 352 times
I'm waiting on the CPU and GALs, plus I have a GAL/ROM programmer coming too. I'm doing without the FPU for now to reduce complexity.

The large 68K socket is not soldered in yet, as I have to decide how it's going to connect to the mainboard

I think the next job is to build up the courage to remove the 68K CPU from the mainboard I'm intending to use, and then probably solder in another 68K socket to the mainboard, plug the original CPU back in and test to make sure it still works as normal before the PAK goes in.

I think that I should get the list of jumpers and their functions up here too, as there are many, and I think the only one I know for sure ATM is J4 for disabling the FPU.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

redhawk668
Posts: 29
Joined: Sat Jan 06, 2018 3:03 pm
Location: Netherlands

Re: PAK-68/20 - Repository

Post by redhawk668 » Tue Feb 27, 2018 10:18 pm

I’m still waiting for stuff to arrive, need some more sockets. It seems that one of the components has arrived, only I don’t know which.... Postie hasn’t delivered it, but left a note that I can collect a package at the nearest post office....

Need to have patience, but my build will surface too. A friend of mine has a desoldering station and has offered to help me with the removal of the 68000 out of one of my STFM’s. So, that should not be a problem.
Total retro nut, my collection: 1040 STE, TOS 2.06, 4 mb, CosmosEx - 520 STFM, TOS 1.04, 4 mb, Blitter, CosmosEx - 520 STFM, TOS 1.04, 4 mb - 1040 STF, TOS 1.04, 1 mb, Gotek - Amiga 1200 with Blizzard 1220/4 - Amiga 500 + ACA500 - Amiga 500 + TF530, 1 mb chipram hack.

Atari 8 bit: 800XL, stock - 600XL, Ultimate 1 mb, Sophia RGB - 130XE, 320 kb, Sophia RGB

Sinclair stuff: ZX Spectrum Plus - ZX Spectrum 48 kb and self built clones.

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rubber_jonnie
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Re: PAK-68/20 - Repository

Post by rubber_jonnie » Thu Mar 01, 2018 12:36 pm

So, my CPU arrived today, slowly getting closer to where I need to be. GALs have shipped too and are en-route, as is my programmer.

Should be able to complete assembly soon.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

guus.assmann
Posts: 58
Joined: Sat Sep 23, 2017 8:52 pm
Location: Ede Netherlands

Re: PAK-68/20 - Repository

Post by guus.assmann » Thu Mar 01, 2018 8:13 pm

Hello,
One more thing, maybe a bit late though:
The FPU can be overclocked quite a bit.
Most my 68882-16 do work fine up to 33Mhz or above.
On a 8Mhz or 16Mhz CPU it doesn't help a lot to go faster than about 40Mhz though.
The transfer of all data takes relatively long and at some point this becomes the bottle neck.

The oscillator that you seem to have soldered into the board (hence the "late" remark) is for the FPU clock.
It would be good to put that into a socked as well, so as to be able to change it for a faster one....
And without FPU, the oscillator is not needed.

BR/
Guus

redhawk668
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Joined: Sat Jan 06, 2018 3:03 pm
Location: Netherlands

Re: PAK-68/20 - Repository

Post by redhawk668 » Thu Mar 01, 2018 9:04 pm

Yes, the CPU clock is derived from the 8 mhz clock from the ST and doubled on the card itself. The oscillator clocks the FPU, as I recall the FPU runs asynchronously from the CPU, so a faster FPU can be used.

Now for something else, today I thought I’d received my GAL20V8’s.. Well, they are indeed GAL20V8 chips, only in the wrong package :(.... I got PLCC28’s instead of DIL24’s :oops:

Put a new order out, they are GAL20V8-25. So, I hope they also work. I also did receive my other stuff from Digikey. Resistors, capacitors, etc. Also received a 16 mhz FPU.

Now waiting for the CPU and the rest of my sockets and I can start the fun :)
Total retro nut, my collection: 1040 STE, TOS 2.06, 4 mb, CosmosEx - 520 STFM, TOS 1.04, 4 mb, Blitter, CosmosEx - 520 STFM, TOS 1.04, 4 mb - 1040 STF, TOS 1.04, 1 mb, Gotek - Amiga 1200 with Blizzard 1220/4 - Amiga 500 + ACA500 - Amiga 500 + TF530, 1 mb chipram hack.

Atari 8 bit: 800XL, stock - 600XL, Ultimate 1 mb, Sophia RGB - 130XE, 320 kb, Sophia RGB

Sinclair stuff: ZX Spectrum Plus - ZX Spectrum 48 kb and self built clones.

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