In general, since I am a novice with Socket 5/7 PCs, I've been told there's a jumper setting on normal boards for the CPU. Does anyone see that on the PC Compatibility card? I have some high res scans of the cards (low res thumbnails—click through) of the Pentium 100 12" card (the one I hope to modify).

To throw a monkey wrench in the works, the Pentium 166 board is …different. I don't have scans, but a decent res photo of the two (back side), P100 top, P166 bottom. I added the heatsinks to the Viper and LSI chips, because boy they get hot even while the "PC" side is off.

The P166 appears to have some 000 SMD resistors (jumpers?) around the CPU, but again, I'm not technically deep as to know off-hand what's doing what here. Thanks.

If someone that has a 486/DX2 PC-Card in a PPC 6100 or other compatible model, could you please test installing win30?
I can't get Win30 working on that card with the chips450 drivers. I thin k I know why, but that does not help.

Installing Win30 in standard vga-mode 640x480 16 colors works fine.
After rebooting the machine, starting win30 always crashes to the desktop after loading the logo.
I can run win30 in standardmode if I start "win s"
If I install the suitable win30 drivers for the ct450 standard mode also crashes to the desktop.
I think win30 does only work in standard-mode and the ct-drivers need perhaps 386-mode.

I've just got PC Compatibility Card (PCI) working inside PowerMac under 9.2.2 with PcSetup 1.6.4. I confirm MIDI in/out are working perfectly and I have Voyetra Sequencer running just fine.
See here:
https://www.instagram.com/p/B9yN--ChBHh/
Obviously, unlike PDS version, PCI one has MIDI i/o routed.

I have read that on g3-machines pci-cards from apple do not work, only other cards from orange...there was something on the voltages.
what g3 do you have exactly and what pc-card are you using?

They work, but you need to install a more powerful PSU.

FWIW I've had them (7" Cyrix100, 12" Pentium100, 12" Pentium166) running for hours on end on several Power Macs of the era to no ill effect. A lot of these were meant for and bundled with midling desktop machines, like the 7200. The one consistent exception is the 12" Cyrix 133"P166" card which only came bundled (possibly standalone from Apple, I'm not sure) with the Power Macintosh (7220)4400/200 PC Compatible model. And the manual specifically states not to use this card with any other Power Macintosh (7200-9600).

The main hypothesis is that since the 4400 is a clone, for all intents and purposes (see Motorola StarMax et. al.), and was essentially a quasi(proto?)-CHRP spec machine: it had an LPX PSU with different (stronger?) output than a normal Mac, despite a similar overall W rating, which the Cyrix card took advantage of. Most anecdotes show that putting this specific card in a lesser Power Mac (e.g. 7600) would fry the PSU. Again, I haven't looked at an OEM 4400 PSU in a while now, as mine was toast when I got it and re-wired a Dell ATX (300W) PSU and have never had issues. IIRC, the OEM rating was only 180-200 W. While not as powerful as say a 9600's PSU, there might be design differences. It wasn't until the Power Macintosh G3 (beige) minitower that got an actual, standard ATX PSU. Most everything was custom to what the board design needed, and not much else.

I have read that some newer machines do not match the voltages +/- 5/12volt. but I am not sure about that.

I have an original Commodore A2386SX that is a 386 16Mhz PC Bridgeboard. I have installed it in my Amiga 4000. I have not tried it yet but someone says it is much slower than a REAL pc with the same CPU. I also have a 486 SLC 50Mhz to transplant.

jessenator wrote on 2020-02-27, 21:06:

Sorry for the necro quote—also, hi. I sort of discovered this forum by way of the 68kMLA forum. […]
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dr.zeissler wrote on 2016-07-31, 12:29:

Can the cpu be changed like on orange cards?

Sorry for the necro quote—also, hi. I sort of discovered this forum by way of the 68kMLA forum.

Has anyone ever attempted to socket and change the CPU on these cards?

As far as I can tell, based on Oliver Schubert's site, the BIOS is all contained in the PC Setup control panel. Is any modification necessary? I've been looking at CPUs with similar specs (most importantly voltage and TDP) and a WinChip 200 seems like an okay upgrade (for the P100 card, anyway).

It also seems like there's ample lateral space on the 12" card itself for a socket 7 ZIF. ANyway, I'm sure I haven't thought of everything necessary for attempting a swap like this, but I'll bump to see if anyone has ever attempted this. Thanks!

The older Houdini I and II can be upgraded. The I has a stock 25mhz FSB... but you can drop in a SX2/50 with no trouble. Move a resister and you can run it at 33mhz... move a different one and I think it opens up DX CPUs.

The Houdini II comes with a Cyrix 486 DX2/66... but can be swapped for an Intel part for a tiny little speed bump. Or since it's a 169pin Socket 3, you can ad a DX4/100 Overdrive, or any of those AMD 5x86/133 chips from companies like PNY (as long as they have the 5V step down adaptor built in, you should be fine).

Can the Houdini II card (486-DX2/66) from the PM 6100 put in a 68K Centris 610, or do I have to search for the Houdini I card with 486-sx/25
...or is it possible to swap the DX2/66 out of the houdini II and put a 486 SX-25 in it?

dr.zeissler wrote on 2022-11-15, 20:37:

Can the Houdini II card (486-DX2/66) from the PM 6100 put in a 68K Centris 610, or do I have to search for the Houdini I card with 486-sx/25
...or is it possible to swap the DX2/66 out of the houdini II and put a 486 SX-25 in it?

I don't know if the bus freq is fixed to 33Mhz...as for the 68k 610 compatibility, I googled and found a thread on 68kmla where people (including you) posted the card from 6100 worked fine in a Centris...

I dont't have a centris 610 yet, perhaps I will get one....I would prefer finding the suitable houdini 1 card.
I think the Houdini II requires 7.5x on MacOS and 1.64+ for the pc-software.
I would prefer 7.1.3 on centris 610 and perhaps the older pc-software for the houdini 1 will work on 7.1.3.

Houdini 1 has no SB16 ? Then I will not use it.

https://www.reddit.com/r/VintageApple/comment … ible_card_came/

tomytronics […]
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tomytronics

I realize this is a few months late, I just found this by accident. The "L" adapter that came with 486SX is for Centris and Quadra 610 only. Those can also be used in 660av but you will lose the av support. 840av do not have a correct slot to work. Quadra 605 and 630 uses different DOS card and can't use the Houdini line.

There's another Houdini card that has 486DX2 with soundblaster add on, they came in Powermac 6100 but oddly uses Quadra PDS slot. So take the 6100 adapter off, the card is usable in most of Quadra and all of Centris. I have the 6100 version installed in my 650 and playing music through DOS version of Ultima 6. You can use the 6100 L adapter with the other DOS card containing 486SX, and a PowerPC upgrade card for Quadra also fits in that (probably won't work since 6100 already has PPC)
Remove the adapter, the card can fit in Quadra 650, 700 (lid won't fit on without a mod), 800, 900, and 950. You will have to route the cable through the slot to connect the card to monitor, and to be careful not to jostle the cable while it's running. Reply did release extension card but it's rare as fuck. I have one (lucky eBay sale 6 or 7 years ago). This one was unreliable due to dirty ports but it was simple enough that I cloned the PCB. 2 connectors from Digikey and it's working in my 650, although I think it needs a minor fix: better RF covering. The original card was 4 layers, signals was in between ground planes. Mine was made with cheaper 2 layers with no cover.
Front of the extension card, installed Back The metal plate came with the original Reply extension card but a short ground jumper connecting both PCB through the screwhole should work.

!!!! https://web.archive.org/web/20120428115825/ht … os/q610dos.html

In short: If I get the centris 610 I have these options:
- Getting a Houdini 1 with 610 PDS adapter. Problem = no SB16 Sound
- Using a Houdini 2 with the PDS Adapter of the 610 because the PM 6100 PDS Adaper is not the same!

So the only option is hoping to find the Centris 610 PDS Adapter (I have a Houdini 2 card)

Doc

https://web.archive.org/web/19990222021141/ht … Eanton/houdini/
https://web.archive.org/web/19970614224541/ht … udini/tech.html

A PowerMac 6100, some Dos Compatibility card, Apple or Reply branded:

Interesting function here:

Tripping up an error message on a soft reboot:

What do you mean "Run Setup"? There is a Setup screen?
Looking up in a Bios dump made in Dos, which is really just a resource inside the pcsetup application, there are mentions about pressing "F2 to enter the bios setup now", or ctrl-alt-s, and the latter works just after the memory check, it's not mentioned on the screen though.

Spoiler

Accessing the Cmos Setup:

Drives and Display settings can be changed but don't do anything on reboot.