TF534 + Mem68k

[robban]

Hello!

I did not find anyone that have actually reported this configuration as working, so i just wish to show off this Thing of Beauty:

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Together with a Boobip 2mb memory expansion and gary adapter in and 500+ i end up at 12mb of autoconfiguring fastram (i suppose the 8mb from the mem68k is "kinda-fast" 7MHz though?), 2mb chip and 1mb slowram for any old software that expects it at c00000. To me this makes the TF534 a perfect plug and play package for just about any need i can come up with on a classic amiga A big thank you to Terriblefire and the betatesting team for making this possible!

[go0se]

Looks excellent!

I'm trying to picture how you attached the relocator and Mem68k headers to the upper and lower side of the board. I assume there's a bit of a gap under those female headers on the top of the 534 to allow soldering access? Any chance of a closeup side profile shot and/or a description?

Also, have you taken any rough temperature measurements with that CPU running the big heatsink VS one running without?

Cheers.

[robban]

The female headers are actually soldered to the Mem68k, upside down. Then i carefully adjusted the pin-headers connecting the tf534 and the relocator to get the maximum amount of height on the topside of the tf534. This meant that there was only around 1mm of pin header to solder on the underside of the relocator, but that was enough I will post a picture later.

The heatsink was mostly a last ditch effort to find a problem i had during testing. The processor read 50-52C with an IR-thermometer before the heatsink and i thought it might be too high, as I had problems booting sometimes. It turned out my PSU had developed some intermittent problem with delivering 5V reliably on boot.

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I changed the PSU and all was well.

I will cook the internals properly tonight with the case closed to see what temperature everything reaches (agnus seems to run even hotter than the processor)

[terriblefire]

Nice! glad it all works.

[8 Bit Dreams]

I think You should grab long pins to be able to buils such kind of sandwiches...
Ebay item: 253671549880

[go0se]

Long pins would be ideal, but those round ones wouldn't help for the sandwich as there's no adjustment in them. Female square headers on the topside of the relocator combined with long square male pins such as: Ebay item: 163650502553 mounted with the plastic stop positioned just over half length through the 534 board would give you the extra clearance you need, assuming that the Mem68k is using female square pins.

I think we need to see some more detailed close up images of the individual parts and how it all currently fits together

I think You should grab long pins to be able to buils such kind of sandwiches...
Ebay item: 253671549880

[8 Bit Dreams]

Yeah.. once TF536 arrives this will be out of the game, because it acts like a handbrake to the system. Have similar problems running TF534 in pair with GVP. Total amount of memory i have is 12MB, but ide is terrible slow, only 700kb/s..

[robban]

I agree that longer pins would be better, this is how it looks with normal ones:

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Juuust enough length to make it work I made sure to fill the vias properly in both the 534 and relocator to get a somewhat durable connection.

Do you know how the additional fastram hinder the performance of IDE? I have 1330kb/s in Sysinfo. If i find a full 030 (non EC) i will see what happens with cpu fastrom

And yes, this frankenstein will be very much obsolete by the time TF536 arrives. Still fun to play around with

[robban]

Using a full MC68030RC50 and "cpu fastrom" i get 6.8-7.3 Mb/s! Not sure if those are 100% correct numbers, but navigating folders seems very snappy now.

[go0se]

Ah, you soldered the 534 to the relocator rather than using a female header. Makes more sense to me now!

Cheers for the photos.