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EKA1

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Operating system kernel

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Operating system

EKA1
Developer	Psion Symbian Ltd.
Written in	Assembly language, C
OS family	EPOC (Symbian)
Working state	Discontinued
Source model	Proprietary
Initial release	1989; 36 years ago (1989)
Marketing target	PDAs, mobile phones
Available in	English
Platforms	x86, ARM
Kernel type	Microkernel
Succeeded by	EKA2
Official website	developer.symbian.org/wiki/index.php/Category:Kernel_&_Hardware_Services

EKA1 (EPOC Kernel Architecture 1) is the first-generation kernel for the operating system Symbian OS. EKA1 originated in the earlier operating system EPOC. It offers preemptive computer multitasking and memory protection, but no real-time computing guarantees, and a single-threaded device driver model. It was largely superseded by EKA2.

Much of EKA1 was developed by a single software engineer, Colly Myers, when he was working for Psion Software in the early 1990s. Myers went on to act as CEO for Symbian Ltd., when it was formed to license this kernel and associated operating system to mobile phone makers. He is now CEO of Issuebits Ltd.

See also

Psion (company)

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Psion–Symbian

Pocket computers	Psion Organiser Organiser I (1984) Organiser II (1986)
Clamshell designs	Psion Series 3 (1991) Psion Siena (1996) Psion Series 5 (1997) Psion Revo (1999)
Subnotebooks	Psion netBook (1999) Psion Series 7 (2000)
Laptops	Psion MC series (1989): MC200, MC400, MC400 Word, MC600 DOS

Operating
systems

Kernels	EKA1 (1989) EKA2^° (2005)

EPOC
- EPOC16–SIBO (1989)
- EPOC32 (1997)
Symbian^° OS (1997) (GUIs: MOAP(S) (2001), S60 (2001), UIQ (2002))

Open Programming Language, OPL (1984)

Organisations

Psion (1980) Symbian Software (1998) (UIQ Technology (1999), Symbian Foundation (2008))
Executives	Nigel Clifford (Symbian) David Levin (Psion, Symbian)

italics = Microkernel
^ = Real-time
° = Open-source software
Category: Psion devices

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Microkernels-nanokernels

L4 family	Eumel → L3 → L4° OKL4°
Macintosh hosted	Mac OS nanokernel NuKernel
Psion	EKA1 → EKA2^°
Amiga-type	Exec ExecSG Quark WarpOS

ADEOS°
EROS^°
K42°
Little Kernel
Mach°
- GNU Mach°
MicroEmpix
µ-velOSity^
nucleus
Off++ → Plan B
Opus
PowerUP
RTLinux°
TI-RTOS kernel^°
Vanguard

Operating
systems

POSIX support

Unix-like	ARX GNU Hurd° Lites MeikOS Minix° Minix-vmd° Minix 3° MkLinux° Multi-Environment Real-Time^ (MERT – Unix-RT) OS2000 QNX^ Redox° Spring Tinix UNICOS VSTa
Partial	ChorusOS^ Integrity^ Nucleus RTOS^ NuttX^° OSE^ RIOT^°

Capability-based

GNOSIS → KeyKOS → EROS → CapROS
Hydra
seL4^°
Midori
NLTSS
HarmonyOS NEXT (OpenHarmony, Oniro OS) → HarmonyOS

L4 kernel

LLinux^°
PikeOS^
REX OS^
Wombat^°

Java virtual machine

JavaOS (Chorus/Jazz^ integrates ChorusOS^)
JX°

Macintosh hosted

Unix-like	MachTen MacMach

Copland
Classic Mac OS (PowerPC kernel)

EPOC → Symbian OS^°

Amiga-type

AmigaOS
AROS°
- AspireOS°
- Broadway°
- Icaros Desktop°
MorphOS

Pink → Taligent OS → Workplace OS

Amoeba°
BeRTOS^°
ChibiOS/RT^°
FreeRTOS^°
HelenOS°
µC/OS^°
MQX^
OpenComRTOS^
Phantom OS^°
RC 4000
SharpOS°
SPIN°
Thoth^ → Harmony^ → V
VRTX^
Zephyr^°

Frameworks, kits

Italics = discontinued
^ = Real-time
° = Open-source software
Category: Microkernel-based operating systems Category: Microkernels

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