
Installation of ULTRIX 4.5 in GXemul, on an emulated DECstation 5000/200, according to these instructions: gxemul.sourceforge.net The CPU emulated was a MIPS R3000 (32-bit, mips1), although ULTRIX 4.5 on that particular machine could perhaps also run using a R4400 CPU (64-bit, mips3). ULTRIX is not a meaningful operating system by today's standards, but from a computing history preservation perspective, it is nice to still be able to run it. One screenshot was taken every 0.2 seconds, so at 25 fps it plays five times faster than real-time (where "real-time" is how fast the emulator ran on my particular machine, not how fast ULTRIX ran on real hardware). The graphic board used in the emulated DECstation machine, PMAG-BA, has a resolution of 1024x864, which was best represented as 512x432 with pixel averaging. ULTRIX does not draw cursors (text nor graphical) as regular graphics using the framebuffer, but rather uses the PMAG-BA's hardware sprites for that. GXemul supports emulation...
Author: 0debug; Tags:
ULTRIX
MIPS
R3000
gxemul
computer history preservation