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that's basically what I thought when I saw it, I was randomly skimming the code for other reasons. it may be a lead on things to mess with if the djmemc changes aren't enough to improve the overclock. I'll note, as an aside, that the nubus interface has its own clock, so maybe if the onboard...

brief note on something to look at: the video driver for these machines checks the CPU speed, see DAFBDriver.a and search wombatspeed maybe there are other drivers that also check like this

do you have a programmer? I've been trying to figure out the most convenient setup for experimenting, but I haven't seen anything great yet.

You need a disassembler to turn the hex into instructions, but the problem is that the hex may be either data or instruction, so it needs a lot of manual work to disassemble a whole ROM into something fully useful. based on this, one can search for "7000 72FF 2448" and replace the "7000" with...

yes, I wrote a little script to calculate and insert a new checksum. (I just also checked with a deliberately incorrect checksum, it looks like BasiliskII will boot anyway, so maybe that's not a good test) Entirely disabling the checksum verification code is also doable, but I kinda like...

So I had some caffeine today (bad idea), and ended up writing some scripts to mess with ROMs. Since this is probably going to be a bunch of related little bits of stuff, I've made a new github repo for it (see the rom-hacking folder for details). A proper disassembly would be cool, but for now...

So in reading the code and wondering how to get the other config settings going, here's another twist * the changes in the source for speedbump are dated "9/26/93" * there's some more changes dated "12/7/93" * Centris 650 release date: February 10, 1993 * Quadra 650 release date: October 21...

all of the stuff it prints is read from the registers or reported by the OS, the "ideal for XX mhz" takes the number of cycles in the register and basically reverses the calculation described in the ROM comments (+/- rounding errors) there are like 6 different ways that the ROM seems to set the...

Did a little more work on ultra-wombat-hax-tool, code and the new binary are on github (or download from my site). It interprets the bits and nicely prints a little more info.

Only have the one, someone was selling a pile of them on ebay for $5 each last year (must have found some old stock).

are you in the US? since I have no use for it now, I'm willing to send you my macclip so you can test out clock speeds without needing all the oscillators, send me a message if you're interested it looks like gestalt 51 will work for 7.5.3 and later, so that's probably the one to go with (so...

the comment on that line in the definitions is "Top of stitched RAM" so I think that's just the "top" address of the physical RAM. I couldn't easily tell from reading the source, so I think the question is now: does a gestalt of 59 (or maybe 51) convince it to load the speedbump values?

Ok, you got me hooked, I just wrote a little program that reads the values out of the djmemc configuration registers. Here's "ultra-wombat-hax-tool" which you can also download, for the moment, from http://www.cy384.com/media/bin/ultra-wombat-hax-tool.bin (I'll put the code and whatever on...

Thanks for the report, I'll take a look at what's going on, that's not an error I expected to see.

I think the cat is out of the bag on this one, so here's a thread announcing my SSH client (beta release): SSHeven is a bare-bones open source SSH client with support for the latest protocol version and encryption standards, allowing access to the default configurations of all modern servers...

I'm now very curious what my C650 gets detected as and what values it picks for these various registers. Sometime soon I'll try to write a little program to read them out (like what the VIA reports, what timings it chooses, etc.). Maybe a modified ROM could be made to get more overclocking...

My C650 has 70ns onboard chips. The socket is a pretty ordinary one plus some bits of wire.

I've been running my Centris 650 at 44 MHz for 8 months or so with no issues; actually I'm a little unhappy it wouldn't run at 50 Mhz. I started with a NewerTech MacClip Junior, but didn't like how flimsy it seemed, so I soldered a socket on top of the original oscillator. The stock...

weirdly, scsi2sd can cause a sad mac if there's garbage data on the SD card, so try zeroing it out.