Recent content by herd

Nice find! Thanks for sharing. Do you have plans for it?

What CPU does it have? I would guess that a 1.4GHz upgrade uses a 7455, and if so it would not need anything changed in the firmware.

If quake is your measure of daily usage, then yes, the only thing faster than a pentiumTM is another one with more cache. My point is, I think you are looking at a very narrow part of the scene and the comparison is not objective. Even including other games, on nearly the same hardware, shows...

I was curious so I looked and the dnet statistics server is still up: cgi.distributed.net/speed/ You can pull up graphs like this: The thruput is fairly linear vs clock speed, and the slope of the lines shows the efficiency of the chip. For this thread, here are some specific results I...

Respectfully, I disagree. I think that would be one of the worst ways. Even among contemporary x86 chips, quake is notorious for skewing results due to the hand-tuned assembly made specifically for that particular FPU. There are detailed explanations of this available. If quake is the only...

There is still a lot of good info in archives of cubeowner.com

I thought I'd share a little weekend project here. I picked up a "dead" Digital Audio tower and below are some steps I took to restore and upgrade it using extra parts I had. It was in pretty sad condition when I got it. I'm a little curious about its history because judging by the dust...

I can't think of any issues in particular; these are generally nice and reliable. I'd look at the usual things to check on a used computer: cosmetic condition, function, corrosion, broken ports, dirt/smoke/fur, upgrades installed, etc. The power supply should probably be re-capped (or at least...

Are you using a little thumb drive, or a whole disc? If the port works with other devices, it could be that it can't power the drive. Does the drive enclosure allow external power? If the MDD works, you could put the powerbook into target mode and connect it to the MDD as an external firewire...

With a few versions to compare, that location seems to agree with the cache speed. 133MHz 0x86, 150MHz 0x98, 167MHz 0xB1. Maybe 0xFC is faster than it expects. You could try some other values to see what it does. If you change it to 0x86 then it should slow down to match the iMac version...

Nice work! What does the Lombard EEPROM dump look like? If the Wallstreet CPU had cache chips rated for 150MHz, what is the speed rating of the Lombard cache chips? In the Wallstreet ROM, the 0x98 at offset $012 may be the cache speed. What happens if you change this to 0xFC?

Take a look at "MPCPCMEC.pdf" as this seems to be the closest documentation to what you have. For example, it says: "The Software Presence Detect (SPD) describes the PCM but does not tell the software what register bits to use" So the EEPROM may have an entry for the speed of the cache chips...

I was testing various Pismo CPUs and I have a pile of 64MB memory modules so I stuck one in to test a new CPU. I figured if the newly soldered CPU was going to grenade there was no reason to risk a nice RAM stick too. It did nothing and of course I first suspected the CPU. But after a bit of...

Hello, welcome to the forum. There may be ways of tricking the installer, depending on what it's looking for. For real hardware limitations there may be a few; I think OS X needs at least 128MB of RAM to even boot, for example. One common approach to this sort of thing is to use a supported...

The external L2/L3 cache is configured with a register, via software. This can be done at boot through the firmware and/or after boot with software that has access to CPU registers. To get an idea what is happening at boot, look for a .pdf titled something like "Yosemite BootROM ERS.pdf" which...