Recent content by joevt

@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...

I think you mean 21.1 cm x 13.1 cm = 8.307 in x 5.157 in = 9.778 in diag = 77.2 dpi cm instead of mm.

You would need to drill through the transparent piece and the plastic of the subframe? The alternative to drilling or cutting is melting. Heat a metal pin (with soldering iron?) sufficiently that it can be inserted into the plastic. Is that possible? Will the hole that is created snuggly hold...

I think it would look cleaner without the transparent plastic piece. The JB Weld might perform better if it's thicker but I have no data or experience (more JB Weld probably means more elongation?). It's a tossup. If JB Weld doesn't stick to the plastic well then it would be nearly useless...

The error may be up to less than an 1/8 of an inch which is not bad since you are measuring in eighths of an inch. bc <<< 'scale=10; (sqrt((5+2/8)^2 + (8+4/8)^2) - (9+7/8))*8' .9249648104 Remind me, do 68K portables have square corners or round corners? Round corners make it difficult to...

The vertical and horizontal resolution also needs to be known to calculate the DPI, but this info can be gathered from the Mac's specs. Alternatively, you can also just use the horizontal number of pixels and width or just use the vertical number of pixels and height. Using the diagonal is...