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Amstrad PPC640. I used to own one of these, it's a great little portable turbo XT.

Large Scale Systems Museum (LSSM) - mact.io - Pittsburgh, PA

#lssm #large scale systems museum #amstrad #amstrad ppc640 #ppc640 #luggable

Bought some games

Infocom made a ton of text adventures in the 1980s, this is their first collection. Titles like Hitchhikers guide to the Galaxy and Zork.

This computer doesn't like graphical games, even if it can run them. He is picky

#vintage computer #1980s #old computer #amstrad ppc640 #retro game

got my PPC640 to dial in to a BBS successfully

#BBS #amstrad ppc640 #old computer

#old computer #Amstrad PPC640

PCDR 1.5 benchmark results from all my current DOS-capable machines (and one that I sold years ago)

The 286 results are my Toshiba T3100 (1986) semi-laptop in "low speed compatibility" mode attempting to approximate an IBM 5150's performance and in the normal full speed mode. The V30 result was my Amstrad PPC640 (1988), a portable "XT" (which had no hard drive, hence no fixed disk results)

The Pentium III results are my recently acquired Dell GX110 tower (2001 for this unit) as it shipped to me originally, stuck in "compatibility mode" meant to work with very very slow things, and how it runs after I managed to figure out how to swtich back to normal mode. Note the Massive performance delta.

The Pentium OverDrive results are my AT&T Globalyst 515 (1994) slimline desktop, originally shipped with a 486 DX2 66 MHz and upgraded with the Pentium OverDrive 83 MHz chip using the specially designed socket. Not quite as fast as a similar Pentium in a purpose designed board to be sure.

Of note is that the super slowed down Pentium III - and I spent a bit thinking there must have been horrible damage to it or its cooling to lead to this -performs only around 2.9x as well as the 8 Mhz 286, and only 4.4x faster than the 8 MHz V30 (essentially a sped up clone of the 8086 with some extra instructions and optimizations, commonly used in "Turbo XT Clones" of the time before the 286 came out). And it was performing 1/7 the speed of the cpu in the Penitum OverDrive 83 MHz and its fpu was perfoming at a bit less than half the speed of the OverDrive's fpu. Very surprising and concerning notes! And of course in comparison to running in normal mode it was only doing 1.27% the expected CPU speed and 3.85% the normal FPU speed.

#old computer #toshiba t3100 #amstrad ppc640 #at&t globalyst 515 #dell gx110 #comparative benchmarks