A while ago that bitsavers published a picture of an Apple 1992 Tesseract Motherboard.
It’s from the 68k to PowerPC RISC transition Apple made in the second half of the 1980s and first half of the 1990s where several groups within Apple were working on new equipment.
More details of those are here:
- Michael Spindler: The Peter Principle at Apple | Low End Mac
- Floodgap ANSwers: The Apple Workgroup Server 9150 and the Story of Wormhole
- The PowerPC Triumph
- Apple A-Z – Everything You Need To Know About Apple – Feature – PC Advisor
- Jak Apple RISCoval (better read the English Google translation)
- Chronology of Apple Computer Personal Computers (1993)
Note this is not [Wayback] TesSeRact from the DOS TSR (Terminate and Stay Resident) days:
- [Wayback/Archive.is] INT 2F – TesSeRact RAM-RESIDENT PROGRAM INTERFACE AX = 5453h (less colors and no navigation at the top of the page, but indentation makes it easier to grasp calling register values)
- [Wayback/Archive.is] Int 2F/AX=5453h: Int 2F/AX=5453h TesSeRact RAM-RESIDENT PROGRAM INTERFACE AX = 5453h (seems easier to read because of colorations, but lacks indentation, so it is harder to understand calling register values)
Via [Wayback] Ralf Brown’s Files
Downloadable files by Ralf Brown:x86/MS-DOS Interrupt List, RBcomm, SPAWNO, AMISLIB, DV-GLUE, RBdualVGA,RBkeyswap, RBspeed, PCICFG, CMU-EBMT. (20aug10)
–jeroen
The Wiert Corner - irregular stream of stuff 