Raspberry Pi Zero


What other computer system consumes no more than 1 watt of power and costs $~10?

Though not its intended purpose, RPI0 is way too slow as a desktop computer. RPI0 is fast enough to run GUI, but then most complex programs will run tortuously slow. Some programs ran faster on 25Mhz 80486. A few programs do run fast enough, similar programs don't. Lack of L1 cache is what mainly cripples RPI0 apparently.

ARM once had a reputation for being sleek and efficient. But ARM tossed some junk into RPI0's ARM:

processor   : 0
model name  : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS    : 797.66
Features    : half thumb fastmult vfp edsp java tls 
                                           ^^^^ JUNK



Raspberry Pi OS (RPIOS)

Be warned Linux kernel will suddenly HANG when memory becomes over-committed. (Virtual memory in Linux was never written right.)


NetBSD 10 has almost all RPI device-drivers.


FreeBSD 13 has some device-drivers, but lacks wireless. FreeBSD elevated RPI to 'Tier 1' status, goal is to develop complete RPI device-drivers.

Haiku (BeOS clone)

Haiku project is worth watching, its developers have begun porting Haiku to RPI.


Speed of compiling GNU Emacs


Not equal comparisons. Variously compiled Emacs versions 24..27. Emacs may have been compiled in temp RAM on PCs having ample memory.

  ~40 sec   PC Intel Goldmont+ J5005 SoC, 2.8Ghz, 4 cores
  ~80 sec   PC Intel Core 2 Duo, 2.2Ghz, 2 cores
 ~115 sec   PC AMD64X2 2.2Ghz, 2 cores
 ~470 sec   Mac Mini PowerPC G4 7450 1.33Ghz
 2613 sec   Raspberry Pi Zero W, 1Ghz 32-bit ARMv6, 1 core



RPI Foundation will become (or already is) a major manufacturer of computers. Whenever RPI Foundation begins making RPI notebooks, predict RPIs will be sold in physical stores across America and elsewhere (like Commodores were).