Harris H series - Revision history

Jnc: Fix to match new category name

2023-12-22T16:22:24Z

Fix to match new category name

Larsbrinkhoff: Typo.

2023-08-10T06:45:48Z

Typo.

Larsbrinkhoff: Might as well.

2023-08-10T06:45:19Z

Might as well.

Larsbrinkhoff: Stub, because I like odd word sizes.

2023-08-10T06:42:23Z

Stub, because I like odd word sizes.

New page

The Harris '''H series''' computers began with the '''Slash 1''', or '''DC 6024''', offered by Datacraft Corporation in 1969. Harris acquired Datacraft in 1974 and kept the Slash name for a while. The first H branded computer, the '''H-100''', was released in 1978. In the early 1980s, the H series extended into the [[super-mini]] segment. One of the last models was the '''H-1600''' in 1987.

The integer [[ALU]] width was 24 bits; [[Floating point processor|floating-point]] numbers were 48 bits. The instruction set had support for double-width integers, and a full 48-bit ALU appearing in late hardware iterations. Addressing is by word. Instructions were originally all 24 bits; later architectural updates came with some two-word instructions.

Early [[operating system]]s were '''DOS-II'''—''Disc Operating System'', and '''DMS'''—''Disc Monitor System''. The Harris machines ran the [[virtual memory]] [[operating system]] '''VULCAN'''—''Virtual Core Management Operating System'', later replaced by the newer '''VOS'''—''Virtual Operating System''.

The architecture evolved over the years:
* The compatibility ''C-mode'' had a 16-bit address space.
* The address extension ''X-mode'' had a 20-bit address space.
* The full address ''F-mode'' expanded 48-bit integer capabilities in the instruction set.

In the late 1980s, Harris sunset the H series in favor of a new 32-bit [[Tahoe]] based CX series.

{{semi-stub}}

==External links==

* [http://bitsavers.org/pdf/datacraft/ Datacraft documents at Bitsavers]
* [http://bitsavers.org/pdf/harris/ Harris documents at Bitsavers]
** [http://bitsavers.org/pdf/harris/Evolution_of_the_Harris_H-series_Computers.pdf Evolution of the Harris H-series]
** [http://www.bitsavers.org/bits/Harris/vulcan/ VULCAN software at Bitsavers]

[[Category:24-bit_Computers]]

@@ Line 1: / Line 1: @@
-The Harris '''H series''' computers began with the '''Slash 1''', or '''DC 6024''', offered by Datacraft Corporation in 1969.  Harris acquired Datacraft in 1974 and kept the Slash name for a while.  The first H branded computer, the '''H-100''', was released in 1978.  In the early 1980s, the H series extended into the [[super-mini]] segment.  One of the last models was the '''H-1600''' in 1987.
+The Harris '''H series''' computers began with the '''Slash 1''', or '''DC 6024''', offered by Datacraft Corporation in 1969.  Harris acquired Datacraft in 1974 and kept the Slash name for a while.  The first H branded computer, the '''H-100''', was released in 1978.  In the early 1980s, the H series extended into the [[supermini]] segment.  One of the last models was the '''H-1600''' in 1987.
 The integer [[ALU]] width was 24 bits; [[Floating point processor|floating-point]] numbers were 48 bits.  The instruction set had support for double-width integers, and a full 48-bit ALU appearing in late hardware iterations.  Addressing is by word.  Instructions were originally all 24 bits; later architectural updates came with some two-word instructions.
@@ Line 10: / Line 10: @@
 * The full address ''F-mode'' expanded 48-bit integer capabilities in the instruction set.
-In the late 1980s, Harris sunset the H series in favor of a new 32-bit [[Tahoe]] based [[Harris CX series|CX series]].
+In the late 1980s, Harris sunset the H series in favor of a new 32-bit [[Power 6/32|Tahoe]] based [[Harris CX series|CX series]].
 {{semi-stub}}

@@ Line 10: / Line 10: @@
 * The full address ''F-mode'' expanded 48-bit integer capabilities in the instruction set.
-In the late 1980s, Harris sunset the H series in favor of a new 32-bit [[Tahoe]] based [[Harris CS series|CX series]].
+In the late 1980s, Harris sunset the H series in favor of a new 32-bit [[Tahoe]] based [[Harris CX series|CX series]].
 {{semi-stub}}