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Power Mac 7200: PC Compatibility

The 7200 was marketed as PC Compatible out of the box and came stock with an 820-0728-A Apple PC Compatibility Card. Getting one of these to work without the original disks was quite a challenge! Let's start by checking it out...


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Once in the case, there's ribbon cables and audio cables running everywhere.

The External Cable (is not required)

It turns out that if you boot the machine up without the cable patched in then it isn't needed; the PC display is routed internally through to your monitor.

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I'm going to guess that the internal ribbon cable, as seen in the last picture above, is the reason for this. It must route the video output through to the standard Macintosh video. I don't know if this causes a performance hit.

Upgrading it

My initial understanding was that the CPU is fixed and so is the on-board 16mb of RAM, but there is an extra slot that you can slap up to 64mb into. See Oliver Schubert's notes here. I therefore purchased an additional 64mb on eBay to get my card to 80mb. Make sure it is 5v NON-EDO FPM 4x64!

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The RAM arrived from eBay (new DIMM is above old in the picture above) and I plugged it in and turned it on. Windows still reported 30mb of RAM (2mb to video, I imagine) and so did the BIOS. I initially thought I'd bought a dud... after a few reboots and poweroffs I still couldn't get the total amount to register. I powered the machine down completely and inspected the card. It seems that the DIMM had around 0.5 of a millimetre more to be pushed into the slot!

Rebooting with a properly seated DIMM showed 64mb in the BIOS. I had actually expected 80mb if it was working properly, as the on-board 16mb should've totalled to that. Nothing I did further remedied this. 64mb worked for me though.

For fun, I removed the DIMM altogether and rebooted. Trying to start the PC got a loud beep. Nothing. It wouldn't start... I then read the actual manual:

Your PC Compatibility Card has one socket available for RAM (random access memory). Some versions of the card come with a DIMM (dual inline memory module) already installed. On these cards, you can increase memory by replacing the installed DIMM with a greater-capacity DIMM.

Some versions of the PC Compatibility Card do not come with an installed DIMM. On these cards, you must install a DIMM in the socket prior to installing the card in your computer. Otherwise, the card will not work.

Hah... so... my card had 32mb in there.. I removed it and added 64mb. When it was partially inserted it somehow appeared as 32mb. When correctly inserted the 64mb was visible.


I then checked out PC Setup and saw that, when no RAM was in, it told me NO RAM.



Mac OS 8.1-8.6

The card just works. The PC Setup Control Panel is installed with the OS and command-return switches you to the PC. I hadn't tried networking from Windows... but I had found that it didn't seem to be configured.

As that the machine came with this OS and had Win95B installed on the PC side, I didn't have to go through anything to get it working. It wasn't until I installed 9.2.2 fresh that I was at the whim of 90's vintage technology.

Mac OS 9.2.2

Nothing. No control panel, no command-return. Mac OS 9 Cross-Platform Issues reports that you can get it to work under 9.0.4... and so I tried for myself on 9.2.2.

Note: This turns into a rant very quickly. If you just want the required files, then jump down to here.

Tips for Running Windows on Mac has a FAQ for getting it to work. They state that networking hadn't worked since 8.5 (probably why it didn't work when I tried.) Their link to PC Setup 2.1.7f failed me, but I found it over here at the PC Card FAQ. It is also available on alksoft's site labelled 'Stuff that might be useful'. Of course... that 'Mac Drivers' link didn't work... so grab it from the PC Card FAQ.

Did that work for you? It didn't for me... the zip from PC Card FAQ had a __MACOSX folder in it and a file that was unrecognised by my 9.2.2 installation. If it still works when you read this, go to the official site here and download the actual driver itself from them.

It worked! And then asked for registration details... enter the following:

  • Licensee Name: FREE
  • Site Number: 469
  • Authorization Key: UEV-EVZ-7TU

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...and I then it tells me that I need PC Setup 1.6.4 installed first. Yey! You'll find the first file you need here. Extracting the BIN will give you a disk image. Simply double-click it and Disk Copy will mount it onto your desktop. Run the installer and reboot.

Once rebooted, I thought I'd try and muck around with PC Setup 1.6.4. It seemed to work, but I had no HDD. I had a 1gb disk in there that I wanted to use natively. Don't even bother trying to use real PC Partitions... go with a Drive Container on a spare disk/folder.

PC Setup will take years to build the drive file, so go make a coffee. Once it's done, start the PC. You'll need a boot disk. There seems to be one at the PC Card FAQ with CD-ROM drivers and the like.

Note: You must insert the floppy only once you are on the PC side. A floppy inserted on the Macintosh side will be mounted onto the desktop and be invisible to the PC. Switch to the PC using command-return and then insert the disk. Use command-E at any time to eject the disk.

Anyway, back to the floppy disk image... the files you've downloaded will prove problematic. It'll be next to impossible to create the disk images as the metadata from the zip files seem to be missing and the files wont be openable in Disk Copy or any such program. Your best bet from here is to load up another machine, say Linux or Windows, and create a floppy. Here's someone else who had the same trouble. Their answer was to get another person to write a physical floppy and mail it to them!

I tried this, booting up my old windows PC with floppy drive, but it didn't work! I'm thinking the zip format was the issue... so I started searching deeper. Googling for more information got me to Oliver Schubert's DOS Card FAQ which had pointers to Apple's download site. This was full of dead FTP links, but gave me the real file names in BIN and HQX. I slapped these into google and came across this directory listing. I don't know who you are yahozna, but I love you. The files were there!.. sitting, waiting to be downloaded. And shite, sometimes things just work: they extracted and mounted perfectly via Disk Copy! I took a copy of the second disk for safe-keeping also.

Turns out this disk isn't bootable. Go figure. You're actually meant to have installed DOS 6.22 from the disks that were originally included with the DOS Compatibility Card. I don't really want to do that, so we'll try trick it. We really just want the drivers for our Win98 install.

Grab the Windows98_SE boot image from here and burn it to a floppy. Once created, grab CDROM.SYS from the PC_Compatibility_1.6.4-2of2 and copy it onto the Windows 98 disk. Either delete an existing driver (like BTCDROM.SYS) and rename it to that, or edit CONFIG.SYS and add in a line for CDROM.SYS.

Or, you can just download the boot disk here that I created which will work fine! It also has all the required networking files.

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Boot this floppy and crawl to a DOS Prompt. You'll get a warning that C:\ is no good, as expected when no partitions exist. Run FDISK and create a new logical partition. Reboot, booting off the floppy again and we should be set... you should now have a CD-ROM drive and usable C: Drive.

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Usually from here, you'd run setup off the CD. Fortunately, we know in advance that the CD will be inaccessible on the second reboot into Windows setup. So, format your disk here and then copy the win98 folder to C:\. You can then run SETUP.EXE from C:\WIN98SE\. This will save a lot of headaches!

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That last screen... Windows will sit there 'updating settings' for a very long time! Prepare to wait for around 30 minutes.

Now you're at the desktop, slap the PC_Compatibility_1.6.4-2of2 disk back in and run setup.exe. Keep all the boxes checked, install the drivers and hit restart.


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After a reboot you should then have your CD-ROM drive in My Computer! Command-Click on My Computer and then choose properties. Go to the Devices tab and you'll see three items that need drivers. With the Windows 98 SE CD in there, you can choose properties and then Reinstall Driver. Let Windows choose the driver off the CD and you'll be set.

At this point, audio still didn't work. Looking at all of the manuals for the cards, you'll note that they all output audio through the CD Audio cable. It's actually patched in... instead of the audio from the CD drive going straight to the motherboard, it is fed into the cd audio input on the PC card, mixed (I assume) and then another cd audio cable connects the cd audio output of the pc card to the motherboard.

The big hint here was that, after installing Mac OS 9.2.2, had I correctly set up the Mac for CD Audio input? Switching back to the Mac and checking the sound panel, I noticed that I was mute to the world. There was no input specified! An easy fix: set this to CD Audio and switch back to Windows. Tada! All the nasty sounds of Windows 98 SE. Actually... I never did mind that guitar solo on the Welcome screen.

Networking wasn't too difficult. Following the 'How do I network the Mac and PC side at the same time?' instructions at the bottom of the pc card faq, I downloaded the DOS NetWare Client file from FreeDOS, copied it to a CD and then transferred it over to Windows on the Mac.

Note: You cannot use multi-session 'USB Style' CDs in the Macintosh. If you're copying files onto a CD in Windows and want it to work in the Macintosh then you have to do it the old way. Select 'With a CD/DVD Player' rather than 'Like a USB Flash Drive'.

Anyway, back to the networking... There's no need to do much here, I've put all that is required on the floppy image I've created. Slap it in and drag the NWCLIENT folder to C:\.

copy-nwclient-over edit-autoexec edited-autoexec

Edit AUTOEXEC.BAT and make sure the following lines are at the end of the file, in the following order:


I'm assuming you would've done all of this from a Command Prompt window inside Windows 98. So reboot your machine once this is done. Hit ESC when you see the pretty Windows 98 loading screen to see what DOS is doing underneath.

Once back in Windows, go to control panel, networks and then add a new adapter. Select the ODI adapter under the 'detected' category. It'll take a really long time... and won't really tell you that it's doing anything... but it is busy! Just leave Windows at the desktop at this point. It shouldn't ask you for a Novell Disk at this point; if it does, then you need to restart the windows side and check your errors on boot up.

add-adapter enable-sharing net-hood

Once installed, reboot as Windows asks. When Windows loads, you should be prompted with a login for Client for Microsoft Networks. You can just hit enter here to set your password as blank.

Once booted, I got to Windows, jumped into a command prompt and typed in IPCONFIG. Oh goody! I had a 169 'internal' IP. This wasn't going to work. There had been no errors, everything seemed to be fine... but PC Setup 1.6.4 on Mac OS 9.2.2 wouldn't let my packets flow. Trying a renew_all on ipconfig reported that my DHCP server wasn't available.

I thought I'd try the patch that was meant for Mac OS 8.5, but that didn't work... it installed, I got my newly patched extension, but on a reboot I still couldn't contact the outside world. Based on the post from Phil Beezley on the FAQ from Oliver Schubert:

...On some Macs, it is also necessary to replace the extension called Apple Enet with the Ethernet (Built-In) extension provided with Mac OS 8.5.
The more official solution to the network problems when using Mac OS 8.5 onwards is to use PC Setup 2.x.

Prior to trying 2.1.7f, I thought I'd try replace this extension. I inserted the Mac OS 8.5 CD, located Ethernet (Built-In) and copied it into the System Folder. It complained that there was an older version in there... how does that happen in 9.2.2? Anyway, You then need to delete/disable/move Apple Enet. Reboot the Macintosh.

It came back up... no errors. Chooser still worked, so did browsing the internet on the Macintosh side... so... I booted into Windows. Command Prompt reported a perfectly defined IP address from DHCP. Internet Explorer even tried to render a page!

configure-ie-1 configure-ie-2 configure-ie-3
configure-ie-4 ie-usage-1 ie-usage-2

After rebooting, I was on the internet! Windows 98 SE is working beautifully! I quickly tried MOD4WIN... nostalgic much? I do wish I could find a copy of Vibe, the MP3 Player that turned into Sonique.

For those who didn't read the fine print

Here are all the files mentioned and how to use them.

Files Comments
Apple Macintosh PC Setup 1.6.4 Disks


The first disk contains the Macintosh side and will get 1.6.4 installed on any Mac OS up to 9.2.2.
The second disk contains the PC drivers. This is NOT a boot disk. The original expectation is that you have already installed MS-DOS!
Macintosh PC Setup 2.1.7f

Windows Drivers for PC Setup 2.1.7f

PC Setup 2.1.7f Setup/Installation Manual

These files were all secured from the Wayback machine. I have no idea if they work or not!
My Windows 98 SE Boot Disk
This disk is bootable and contains the CD driver. It is originally the 98 SE Boot Disk. So it'll drop you to a command prompt where you can use FDISK, FORMAT.COM and then run SETUP from the CD.

I actually recommend that you copy the WIN98 folder to your C drive first! (call it WIN98SE) and run SETUP.EXE from there... that way you wont have to practice magic when it can't find the CD drive during installation.

This also contains the Network Drivers. Copy the NWCLIENT folder to C:\ and edit AUTOEXEC.BAT as specified above.

50mb Hard Disk Image of above boot disk
As mentioned, this is a bootable harddisk image that should work for people having issues booting from floppy disks. It contains everything you need for CD and network. The Win98SE Boot Disk RAM DRIVE is also loaded as D:\ (CD as E:\)
PC Compatibility Card Manuals
7" Card Manual12" Card Manual
The original Macintosh manuals for each card.

It's been a pleasure...


Power Mac 7200: OS 9.2.2

Mac OS 9.1 is officially the final OS supported on the Power Mac 7200. I've got a new PCI graphics card and PCI USB card on the way and so I'll need Mac OS 9.2.2 for full compatibility. Below details how to achieve this.

Mac OS 9 Lives

I had previously downloaded 9.2.2 from here. It's known as Mac OS 9 Lives and it comes as an ISO with Apple Software Restore and a disk image of a partition with 9.2.2 fully installed. To install the software you only need to run the restore and it'll turn a partition on your local machine into a bootable system image.

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..of course, I installed this and rebooted and got the standard This startup disk will not work on this Macintosh. I assume from here you could hack the system folder and edit the gestalt ID matching code (as was done with the 68k) but I instead chose to use OS9 Helper.

To get my machine booting again, I had to find a boot disk that worked fine on my hardware to switch back to the 9.1 startup disk. My old Presto PPC boot disk wouldn't work on this PowerPC... so I had to guess how to boot from a CD. Turns out, with the 9.2.2 boot/firmware, that holding down C at boot will startup from the CD.

Official 9.2.2 ISOs

If you want the real ISO, then go there's more information on it at Macintosh Garden: Mac OS 9.2.2 Universal. You can also get it at winworldpc.

This wasn't going to work either, so I started researching and heard out about...

OS9 Helper

There's quite a few links that explain how the Power Mac 7200 owner should use OS9 Helper to hack OS 9.2.2 into submission. The basic idea is to download OS9 Helper and run it on your machine.

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This application will not hack/fix an installed version of OS 9.2.2. Instead, it requires that a version of 9.1 or a patched version of 9.2.1 reside on a local hard disk. It will then update this to the version you require.

This stopped me from using the partition I'd just created with Mac OS 9 Lives and therefore made me use my previous 9.1 startup disk.

The app requires that the relevant Apple OS Update for the version you wish to install be downloaded locally. I didn't try the download links available... instead I searched the net. Finding this was much easier than expected; it turns out that my own ISP still has a cache of Macintosh software! iinet's public FTP located here has a whole swathe of archaic Apple software to download!

Once you've got the required updater, re-run OS9 Helper. I quickly found out that you can't just jump to 9.2.2, you'll need to follow the upgrade steps and install 9.2.1 first. Installing 9.2.1 via OS9 Helper is a breeze. Once done, restart your Mac. It should boot back up to your desktop without issue.

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Once booted, set up 9.2.1. You're now ready to apply the 9.2.2 update. Do this via OS9 Helper once again.

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And now you're done!

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Power Mac 7200: Power Supply

Whilst searching for a CRT on eBay for the Quadra (that's another story), I came across this item. It was listed as being PC Compatible and, after my last efforts of trying to get a DOS Card to work, I decided to tackle this one.

The Power Mac 7200 was marketed as a PC Compatible because it came with a PCI card containing all the required hardware to run a PC. This card includes a 100 MHz Pentium processor that can have a maximum of 64 MB of RAM dedicated to the DOS/Windows operating system.

Powering it on

The case contents rattled a little, so I opened up (there are two push-buttons on the front under the lip) and inspected it. A few plastic lugs had snapped loose, but there was nothing conductive. With the case open I jammed in a power cable and hit the power button.

Nothing. Not even a zap, whirrr or beep. Just silence. I hate that...

Basic principles told me to disconnect all unnecessary components and try again. No love... Pulled the CMOS Battery, held the CUDA button (but not for 15s), left power off 10minutes... no go.

Testing the power supply (Delta DPS-150GB A) (Apple 614-0039)

From here I thought I'd tackle the power supply first. I didn't want to believe it was the logic board. I disconnected the cables and removed it from the case.

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There are 4 screws holding the lid of the power supply on. After removing these, you'll then have to slide the lid along the main trunk of power cables. Pushing the cables into the supply will make this easier. The fan has a 2-wire cable which easily pops off the main power supply circuit board.

Once open, I first inspected all components for damage... all looked good. Testing the fuse showed that it worked fine... conducting power. I then grabbed the multimeter and tested all of the pins. I found 5v on pin 4, but no voltage anywhere else.

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Here's the pinout for the main 22-pin connector, looking at the plug as if it was facing away from you. Pin 1 is top-left, pin 22 bottom-right.

+5v +5v +5v +5v GND GND GND GND GND N/A -12v
TRKL +5v +5v +5v +5v GND GND GND GND /PFW +12v

And then the secondary 10-pin connector. Pin 1 is top-left, pin 10 bottom-right.

+12v +12v +12v +12v +S

These power supplies are triggered by the power switch on the motherboard. Plugging them into the wall will get them in to 'stand-by' mode and power should be visible on certain pins. To test this, plug the power supply into the wall and check the following:

  • (22-pin connector) +5v is visible on pin 12 (Yellow)

One important point is that, in my case, the 5v above showed up on the correct pin. The power supply still would not power up. It turns out that the above test is not fool-proof; it'll simply tell you if the initial 'trickle' power is available.

To get this thing to power on whilst disconnected from the motherboard, follow these steps (Thanks goes to LT.Maddog420 on the Tech Guy forums):

  1. On the 10-pin secondary cable, connect pin 5 (White) to any of pins 1-4 (Black)
  2. Still on the 10-pin secondary cable, connect pin 10 (Brown) to any of pins 6-9 (Orange)
  3. Confirm the power supply is plugged in to the wall and that the pins connected above are not exposed or touching metallic surfaces.
  4. Now, on the main 22-pin power plug, connect pin 12 (Yellow) to pin 21 (Purple)



The above should jump-start the power supply. The fan should at least fire up. If you get nothing then you've got a dead power supply. This would be the first item to replace in a Macintosh that doesn't power on. Of course, when the supply died it could've also fried other parts... but replace the power supply first as it's cheaper. I tried to jump-start mine and it didn't work at all. I decided to pull it completely apart for thorough inspection.

Cracked Circuit Board

Once out of the casing, the issue became quite obvious. The base circuit board for the power supply had a crack in it. The crack formed a semi-circle around the area where the circuit board is held by notches in the metal case. It seems that, somehow, the board has received lateral pressure and cracked! It doesn't quite make sense as the board is thoroughly enclosed. I can only imagine that weather/heat has caused this. I have a hunch that this machine had been out in the elements for a while.

There also seemed to be new flux and solder at the base of a 3-pin component. I really wouldn't be surprised if this had been repaired in its past life; this machine is nearly 20 years old.



Repairing the crack was pretty straight-forward. I was really lucky that this was a single-sided circuit board with large tracks. If there had been tracks on the top side, then this would've been a lot more difficult.

I bared the copper on the tracks around the solder joints and messily bridged all of the component pins. I made sure that I followed the tracks and didn't bridge any circuits. My butane-powered soldering iron decided to let its tip melt in the process and so the first fix shown below looks really crappy. I bought a proper soldering station (I needed it to work on the DOS Card for the Quadra 950) and re-did the soldering. Hence the two pictures of the finished job below.

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And then... the friggen thing spun up! Using the jump-start instructions above, I bridged the two wires and then joined yellow to purple. It felt like I was hot-wiring a car and I, honestly, had very little faith in my hack working. I had a celebratory beer as the fan kicked off and I then crossed my fingers that the logic board wasn't also damaged.

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A final note: be careful when pulling/pushing the bunch of wires in and out of the power supply case. You can easily peel the insulation off the individual wires and the last thing you would want is a short!