Recent content by joevt

The default boot-device is disk2:aix disk2 is a devalias for /bandit/53c825@11/sd@2,0 The default diag-device is cd fd:diags which I guess is a list of devices? I'm not sure how to interpret this because cd is not a devalias. It appears that cd is a special device that initiates a search for a...

Is it the first of these? 1987-03 - 97851DB6 - MacII (800k v1) 1987-12 - 9779D2C4 - MacII (800k v2)

My suggestion of creating an Open Firmware script to patch the firmware won't work if you can't boot into Open Firmware. Startup the B&W G3 with the programmer switch held down as if you were going to perform a firmware update (read the firmware updater instructions from Apple). Let go of the...

Apple II sound is 1-bit but it's not just a square wave. There's same oscilloscope captures in this video:

The firmware updaters from PowerLogix and Sonnet for G4 upgrades do not appear to be in the form of an Open Firmware script so they cannot be applied from Open Firmware. https://www.sonnettech.com/support/kb/kb.php?cat=317&expand=_a3&action=b153#b153 Apple's Firmware Updater (to upgrade to...

@startvec.>'excp stores the default exception handler which is _exception This does a throw of the exception vector number. Maybe it can be replaced by something that saves more info (copy all the registers and the stacks?). @startvec.>'syscatch stores the default catch handler which is...

I have a Trace for Open Firmware script that can show what's getting executed. It needs more work but can do some simple stuff. It works by patching every word or words that you explicitly ask to patch. Then when you enable tracing, it will output each word as it enters and exits, and displays...

The nvramrc script and nvram variables that get modified by classic Mac OS are stored in OFpt resources in the Startup Disk control panel. 'OFpt' (128, "PowerSurge") 'OFpt' (129, "PowerExpress") 'OFpt' (130, "Gossamer") 'OFpt' (131, "PowerMac G3") 'OFpt' (132, "Wallstreet") 'OFpt' (133...

Does the ANS graphics controller or internal SCSI devices work once you are booted using the 1.1.20.1 ROM? #42 describes ndrv's in 2.0 that aren't in the other versions. These ndrv's can probably be converted to system extensions to make the ANS graphics controller work and the...

Right. 1.1.20.1 and 2.0 have a normal implementation for AAPL,ROM's load and open words. 1.1.22.1 removes a call to <bye> in AAPL,ROM's load word and changes open to always return false. 2.26B6 and 2.26NT has normal load from 1.1.20.1 but broken open from 1.1.22.1.

Does the extra work require more than the nvramrc patches for the AAPL,ROM device I suggested at https://tinkerdifferent.com/threads/apple-network-server-macos-based-roms-found.4756/post-41404 ? (unselect-dev should probably be device-end) The first 3 MiB (68K ROM) of 2.26NT matches 1.1.20.1...

So pci137a,5 is probably connected to the pci-bridge. The bridge is a "XIO2000(A)/XIO2200A PCI Express-to-PCI Bridge" which means pci137a,5 is a PCI controller instead of a PCIe controller. The Accelsior probably doesn't have an Open Firmware fcode image in the PCI Option ROM? Apple never made...

Are you sure the SATA controller is not the one in SLOT-2? ASMedia (1b21) ASM1060 is a SATA controller PCIe 2.0 x1. The bridge chip says the connection is only 1 lane so putting it in a x8 slot is not going to improve things (unless that slot is closer to the CPU?). You'll always be limited to...

Your benchmarks for the Orico are better than SATA I (150 MB/s) but not SATA II (300 MB/s). Are you sure it's connected as SATA III? What does the PCI and SATA tabs in System Information.app show? Power Mac G5 with PCIe has PCIe 1.0: 2.5 GT/s per lane * 4 lanes * 8b/10T = 8 Gb/s. 8 Gb/s * 1B/8b...

B&W G3 Yosemite REV C schematics at: https://www.macdat.net/repair/apple_schematics.html The pages are not in order and it's not OCR'd and Apple's OCR has a tough time with 80% of the text. There's a revision history with many items but they are not detailed. For U48, it says "PROG, CMD HACK...