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Bolle

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9 minutes ago, Bolle said:

I am also curious to see if it works in the IIci and IIsi.

It works in the Iici as is, but the IIsi had a special single slot adapter (no PDS port). I think it was due to power or something like that.

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I have an adapter for the IIsi of course ;)

 

The T601 was supposed to have different part numbers and ROM revisions depending on what Mac it was made for, that’s what makes me curious.

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I think that SE/30 NIC is meant for a IIsi or IIsi/SE/30.   The SE/30 would never have a use for an FPU socket.  That might explain the lack of a PDS pass through.

 

There is some discussion on "The Unofficial Turbo601 Home page" about using the Turbo601 in a IIvx.  There was some kind of video problem, that led to Daystar issuing a special ROM for the card, IIRC.   The Unofficial Turbo601 Home Page went down a while back, but I think  it is archived, or possibly mirrored.

 

https://web.archive.org/web/20040415145546/http://www.brinnoven.co.uk/turbo601/miscinfo.html#anchor475621

 

If you ever have the heat sink off, would you post the CPU's rated speed?

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It’s a 66MHz part... first thing I checked.

I have a spare 100MHz chip, not sure if I should attempt the swap though. That’s some damn fine pitch right there.

 

It seems to have the 256 color patch as it did work just fine at 640*480@16bit color with the onboard video.

Edited by Bolle

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4 hours ago, Bolle said:

It’s a 66MHz part... first thing I checked.

I have a spare 100MHz chip, not sure if I should attempt the swap though. That’s some damn fine pitch right there.

 

Debatable.   I wouldn't do it.    And you would need to have an ICS9178 chip in order to perform the speed bump, otherwise it just runs at 66.   Guessing, I haven't actually read the datasheet carefully, the PPC601 doesn't generate its own internal frequency based on jumpers, but gets it from an external clock source.   It's easy to generate a 2X or 1/2 clock.  But generating a 3X clock is more challenging, hence the need for the ICS9178.   I could be completely wrong.  I really need to dig out the PPC601 datasheet, assuming I have one here somewhere.   But that's what I've been assuming all these years.  Otherwise, why do the clock tripled PPC601s need a special PLL/clock buffer?

 

I hesitate to mention this as I don't want to encourage any murders, but the ICS9178 is also on the PM8100/100 and faster.   I think I've seen it come up on Ali Babba or other Chinese suppliers as well.  No idea if those are trustworthy.   I've seen an MPC part that serves the same function, maybe on the 120MHz PPC601 CPU card for the original PowerTower (Power Computing), oh, and probably on the faster 7200s, but it is not pin compatible with the ICS9178.

 

Instructions for switching from 2X to 3X are on Marc Schrier's Clock Chipping Home page, which is also gone now, but preserved/mirrored.  (Is it mirroring if it's gone?   Imaged?)   However, the Turbo601 does not like to operate much outside its 33MHz bus speed.    So, you can't slow down much below 96.   And I'm not sure if faster will work.   It didn't for me, but that could have been the limits of my PPC601 chip (rated for 66 or 80, can't remember) not the limited range of bus speed of the whole card.

 

I know for sure it won't slow down much.  It might speed up.

 

Almost forgot, though you may already know this.  Some (all?) PPC601 at 100MHz and greater operate on 3.3V instead of 5V.  There was a transition there somewhere between 90MHz and 100MHz.    The PCC Power 120 has a bunch of level shifters on the I/O pins because of this.

 

ICS9178_02.pdf

Edited by trag

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The 601 and 601v are not directly pin compatible because of voltage differences. The fastest 601 you could swap in would be 80MHz. Also the 601 may not support 1/3 bus ratio so an overclock to 100MHz on a 33MHz bus may not be possible. 

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Yeah I agree, leave it alone. Even if it was as simple as a CPU swap, these things are hen's teeth, especially the NuBus varients.

 

I'm lucky I have a 100MHz PDS one for my Q650 but frankly, after trying that and a stock 6100, there's not a huge difference. Probably partly thanks to the 6100 having a little more cache.

 

I am stararting to wonder if I should pull the heatsink off mine and replace the paste though. It kicks out some crazy heat!. Especially when Quaking!

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Yeah I agree, leave it alone. Even if it was as simple as a CPU swap, these things are hen's teeth, especially the NuBus varients.

 

I'm lucky I have a 100MHz PDS one for my Q650 but frankly, after trying that and a stock 6100, there's not a huge difference. Probably partly thanks to the 6100 having a little more cache.

 

I am stararting to wonder if I should pull the heatsink off mine and replace the paste though. It kicks out some crazy heat!. Especially when Quaking!

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I could press that reset button all day and listen to that sweet chime coming out of an SE/30. :D

 

 https://www.dropbox.com/s/jghslvq25kwot99/IMG_720.mov

 

Too bad there won't be happening anything else.

 

The card seems to be working fine in the IIsi and IIci at least in a quick test in both of them.

It lists the following info:

 

ROM Family: $77D
ROM Checksum: $7C4F0317
ROM Version: 2.5f2
Patch ROM Version: 1.1

 

So according to the unofficial Turbo 601 site this card does not have the 256 color fix for the IIvx but still I can select more thousands of colors...

Edited by Bolle

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4 hours ago, Bolle said:

So according to the unofficial Turbo 601 site this card does not have the 256 color fix for the IIvx but still I can select more thousands of colors...

Interesting.   I haven't read the UT601 site in a while.  Was there some indication that hte problem affected some but not all IIvx users?

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19 hours ago, Franklinstein said:

The 601 and 601v are not directly pin compatible because of voltage differences. The fastest 601 you could swap in would be 80MHz. Also the 601 may not support 1/3 bus ratio so an overclock to 100MHz on a 33MHz bus may not be possible. 

The 601 definitely supports a 1/3 bus ratio.   The PM8100/100, 8100/110, 9150/120 and Power 100 and Power 120 all used it. Oh, and the PM7200/120.    Also, the Turbo601 I switched from doubling to tripling had either a 66 or 80 PPC601 on it, so it's not a 601v vs. 601 feature.

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To be fair the only proper 601 you mentioned in your list was on the Turbo 601 where all the others were 601v; the original 601 didn’t exceed 80MHz and Apple never used them at 3:1, only the later >100MHz 601v-based models (the only exception being the 7500/100, running 2:1 on a 50MHz bus). 

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Are the 601 and the 601v different enough that you would expect one to support 1:3 and not the other?

 

You seem better versed on this than I am.   Is it correct that the 601 (and 601v) don't synthesize their own CPU clock and must be fed both the bus clock and the internal CPU clock?  It may be a failure of my imagination, but I can't think of another reason why the 3:1 cases would need the ICS9178 chip.

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I was on mobile so was not inclined to try to dig up and quote the specifics (i hate touch screens), which is why i said “may not” instead of “does not.”

After looking through the original 601 UM on a proper computer, buried in chapter 8 it appears that the 601 will support operating at bus multiples other than 1:2 but for that you need to do some clock skewing with that chip you mentioned; it’s not as easy as simply changing a resistor for other chips. 

 

Speaking of other chips, I do know for sure that the 603 does not support half speed multipliers where the 603e does. 

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