Search results

No, 7448's especially are quite good power efficient chips, from their datasheets, 15-20W for a 1Ghz 7448 vs 5W-10W for a 500Mhz 7410, so a bit warmer, but nothing like a 7455 or the such like

if your gunning for 600Mhz you can probably leave the voltage alone I think most of the PPC750L's run at about 2.0V, at least thats what I did with the 600Mhz Pismo I did :) I imagine you would want some sort of extra cooling, tho I never bothered with mine but i was only running at 450Mhz...

pretty sure the iBook G3's use lower L2 cache voltages, they are Uninorth machines, I have 7410 swapped one in the past without issue, as have a few other folk i'd go with the 7410, its a cooler running chip much better suited for a portable, espically if you get one of the MPC7410RX500LE...

you will have to edit the config block thusly https://forums.macrumors.com/threads/success-powerpc-mac-soldered-ram-upgrade.2462320/ there is GUI tool config block editor, that leaked recently, for editing this sort of stuff, but I have not personally messed with it much other then finding it...

Awesome stuff with the Video repair, and espically the RAM card upgrade, I am quite curious if it is known how RAM sizing detection is done on the 3400 and Kanga? I know the 3400 and Kanga RAM cards are slightly different, if I shove my Kanga 64MB card into one of my 3400's it shows up only as...

if your upgrading the L2 cache to 1MB total (and not 2MB total) the issue here sounds like Bad soldering or Bad chips, I am quite sure the Clamshell has all the address lines for at least 1MB, and I know @max1zzz has done it it before (but sadly we did not know about the config-block issue at...

if you downgrade the BootROM on a Firewire 800 MDD to a Firewire 400 MDD, then it just sees the NEC USB 2.0 chipset as yet another generic USB 2.0 NEC PCI device on the bus and USB 2.0 speeds are enabled :) this would imply there might be something in the device tree of the FW800 machine...

Whoops, missed the tag somehow, I admit I have not run my headless iMonster for very long (because theres no fan cooling the CPU) but I have put it through quite a few boot cycles n things like that, and its been shockingly reliable, never had much in the way of issues with it all my board...

so the answer to my question of "does a Gazelle ROM contain a ATI Rage Pro fCode image" would be a No then worth keeping that in mind then that its likely even once the ATI Rage Pro is made to actually appear properly on the PCI bus, it wont actually work until theres suitable fcode in place...

Have you checked if the Power Macintosh 6500 BootROM has a suitable fCode image for the ATI Rage Pro? without it, it will just appear like an unflashed PC PCI card in a mac its for similar reasons, that if you put a Wallstreet CPU card into a PDQ it will boot, but with no video, since the...

Oh, I am quite aware, see the Mac OS 8 CHRP thread elsewhere on here but I appreciate the heads up still :) for running 8.6 on unsupported systems you will still need my patched Mac OS 8.6 TBXI to act as a System Enabler in addition to Rairri's patched 10.2.1 TBXI :) (just place my TBXI in the...

Ditto! never seen one with Dip-switches before thats fascinating :) but googling the markings on the PCB does bring up another here https://www.vogons.org/viewtopic.php?t=108217

750P is Motorola's later version of the 750A, its die shrunk and runs at a lower core voltage :) https://www.nxp.com/docs/en/data-sheet/MPC750EC.pdf https://www.nxp.com/docs/en/data-sheet/MPC750PEC.pdf

very cool! does Open Firmware/thus OS X report the 100Mhz bus speed properly too? :) BTW with regards to the whole CPU clock speed thing, it would be interesting to see a 500Mhz 750L tried, those are fully 3.3V compatible, and share the same PVR as the first G3 CPU's so are fully OpenFirmware...

thats only needed because of how PowerLogix themselves setup their CPU cards with the first PLL at a slow speed, you could easily just set it to a higher speed on any 750GX based project you yourself design :)

Very Awesome work!, the Big purple and gold ceramic package 68000 slap bang in the middle of the board looks so incongruous, I love it! and I love this project in general :)

yeah the last of the PowerLogix BlueChip Pismo upgrades used 750GX's on interposers, https://web.archive.org/web/20040531122101/http://www.macopinion.com/columns/roadwarrior/04/04/13/index.html earlier ones did use 750FX's which you can see a physical example of here :)...

very cool to see you got this working! in some regards a full replica of the old PowerLogix 750GX Pismo upgrade :) did you ever manage to get the 7447A/7448 working with your interposer on the Pismo cards?

yeah my lasting memory from that ordeal was the amount of faffing about just to get a Darwin build environment up and running, it turns out for example you (or at least I could not) cannot compile this using an intel tiger install, has to be a PPC one (at first I used an intel tiger VM for ease...

Awesome! glad the swap itself worked :) have you tried it at 83.3Mhz just as a sanity check? its also worth making sure all your RAM is PC100 or even PC133 rated, as I imagine PC66 RAM might not overclock to 100Mhz, and also of course make sure the CPU multiplier is set so that 83.3Mhz or...