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Hate to necro this thread, but this document will probably be of use:
http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/datacomm/GA27-3093-3_SDLC_Concepts_Jun86.pdf
The reason the SCC was needed for LocalTalk is because LocalTalk uses IBM SDLC as its low-level transport protocol (hence the...
Yeah, durr. I had that backwards. Been a while here. I've seen some systems where the ROM was at 0, but the RAM was higher up, as well... (Apollo DN3500 comes to mind)
So, I've got an RS/6000 44P Model 170 here, with a startup chime. I'm curious as to if Dennis Nedry or dougg3 wants to help me take a stab at this. I've got a copy of the latest firmware update from IBM, but the main issue is that it seems to be an executable containing compressed firmware for...
Just a heads up, the 68k does NOT start execution at $00000000. Instead, it loads the starting address at $00000000, then jumps to the address given there. The initial stack pointer is also given at $00000004 (also known as the A7 register).
Here's another fun result:
HP Integrity rx2600, 1.3 GHz/3MB L3 Itanium2 "Madison", OpenVMS 8.4. The compiler is:
IIRC it's a rebadged Intel compiler along with the C++ and FORTRAN ones. I know Pascal and COBOL are modified versions of the DEC Alpha compilers.
386SLC 20 MHz. The SCSI controller performance on that thing blows just about every 68k out of the water too... it's kind of scary that it can reliably pull 3-4 MB/s.
NCSU Design Library. It's in there. While you're at it, DH Hill (the 10-story one off of Hillsborough Street) is a GOLD MINE of vintage computing books.
An IBM PS/2 Model 56 gets about 5900 it seems, under DOS 6.22 with the code built using Open Watcom. Not bad for a 20 MHz 386SX built under license by IBM with added on-die cache...
Too bad token ring didn't catch on too well... in the days before switched ethernet, it was a much better LAN technology. The main thing that gets me about token ring MSAUs (the equivalent of a switch/hub) is that they don't need a power supply... they're passive devices that only need power for...
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