Procestrum princeps
Procestrum princeps est pars computatri, quae operationes agit et regit. Sedet in tabula materna.

Partes principis procestri sunt:
 pars arithmeticum 
 pars gubernans 
 pars memoriale intermedia
 pars datorum repositorii

Procestri principis partium multi facti sunt, sed praesenti circuli electronici integrati sunt. Sunt multa genera:
 Zilog
 Zilog Z80, similis Intel 8080 et 8085. Basis computatrorum Sinclaris, TA PC, Tandy TRS80, Commodore 128, Amstrad etc.
 IBM
 IBM PowerPC 750 (G3), 970 (G5) (Mac OS, Linux)
 Intel
 Intel 4004, primus processor circuli electronici integrati
 Intel 8008, octo bit, systema operandi CP/M et alia
 Intel 8080 et 8085, octo bit, systema operandi CP/M et alia
 Intel 8088, sedecim bit internalis, octo bit externalis. Basis primi computatri IBM. MS-DOS
 Intel 8086, sedecim bit, CPM/86 et MS-DOS
 Intel 80186 (mendosus), 80286 sedecim bit CPM/86, MSDOS et Minix
 Intel 80386, 80486 triginta duo bit (Linux, Windows)
 Intel Pentium I, II, III, IV (Linux, Windows)
 Intel Core 2 Duo, Core i5 et i7 (Mac OS X, Windows)
 Intel Itanium sexaginta quatuor bit (HP-UX) 
 MOS Technology
 MOS Technology 6502
 Motorola
 Motorola 6800, octo bit
 Motorola 6803, octo bit, processor computatrorum Matra Alice et Philipps VG 5000
 Motorola 6809, octo bit, processor computatrorum Thomson TO7, MO5, TO7/70 
 Motorola 6502, octo bit, processor primo Applensis, CBM, Atari etc.
 Motorola 68000, 68XXX (AmigaOS, TOS, Mac OS, SunOS)
 Motorola PowerPC G4 (AmigaOS, MorphOS, Mac OS, Linux, AIX)
 SPARC (Scalable Processor ARChitecture)
 SPARC versio ab septimus ad octavus (vel SuperSPARC/hyperSPARC), triginta duo bit, processor computatrum Sun-4 (Solaris)  
 UltraSPARC (vel SPARC versio novus), sexaginta quatuor bit, processor computatrum Sun/Oracle (Solaris) 
 MIPS 
 MIPS R4000, triginta duo bit, RISC, processor computatrum Silicon Graphics (IRIX) et Bull (RISC OS)
 Alpha
 Alpha AXP, sexaginta quatuor bit, processor computatrum Digital Equipment Corporation (OpenVMS, OSF/1, Tru64 UNIX)
 ARM 
 ARM versio ab primo ad septimus, triginta duo bit processor telephonorum (Android,iOS) 
 ARM versio ab octavus, sexaginta quatuor bit
 Hitachi H8
 Hewlett-Packard PA-RISC (HP-UX) 
  

 Apparatus arithmeticus et logicus
 Apparatus computatralis
 Microprocessorium

Notae

Bibliographia
Kuck, David. 1978. Computers and Computations. Vol. 1. Novi Eboraci: John Wiley & Sons. ISBN 978-0471027164.

Apparatus computatralis
Informatica
Technologia digitalis
Elementa electronica