Editing Nascom (section)

{{Short description|British single-board computer kit}}
{{About|the computer kits|the NASA network|NASCOM}}
{{Infobox information appliance
| name         = Nascom
| title        = 
| aka          = 
| logo         = 
| image        = Nascom 2 Computer 1981.jpg
| caption      = Nascom 3 Computer, September 1981
| developer    = Chris Shelton<ref name=ChrisShelton>[https://www.theregister.co.uk/2013/08/21/unsung_heroes_dr_chris_shelton/?page=1 UK micro pioneer Chris Shelton: The mind behind the Nascom 1]</ref>
| manufacturer = 
| family       = 
| type         = [[single-board computer]]
| generation   = 
| releasedate  = Nascom 1: {{Start date|1977}}<br>Nascom 2: {{Start date|1979}}<br>Nascom 3: {{Start date|1981}}
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| display      = 
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}}
The '''Nascom''' 1 and 2 were [[single-board computer]] kits issued in the [[United Kingdom]] in 1977 and 1979, respectively, based on the [[Zilog Z80]] and including a [[computer keyboard|keyboard]] and [[video]] interface, a [[serial port]] that could be used to store data on a [[Compact Cassette|tape cassette]] using the [[Kansas City standard]], and two [[8-bit]] [[parallel communication|parallel ports]]. At that time, including a full keyboard and [[video display]] interface was uncommon, as most [[microcomputer]] kits were then delivered with only a [[hexadecimal]] keypad and [[seven-segment display]]. To minimize cost, the buyer had to assemble a Nascom by hand-soldering about 3,000 joints on the single circuit board. Later on, a pre-built, cased machine named Nascom 3 was available; this used the Nascom 2 board.

{| class="wikitable" style="margin-right:0"
|-
! Model
! Nascom 1
! Nascom 2
|-
! Introduced
| December 1977
| December 1979
|-
! MSRP (price)
| [[Pound sterling|£]]197.50
| £225
|-
! CPU (μP)
| [[Zilog Z80]]
| Zilog Z80A
|-
! CPU speed
| 2 [[megahertz|MHz]]
| 2 or 4&nbsp;MHz (switch on main board)
|-
! Monitor/OS*
| NAS-BUG 1 (1 [[kilobyte|KB]] [[EPROM]])
| NAS-SYS 1, most were shipped with NAS-SYS 3 (2 KB [[read only memory|ROM]])
|-
! RAM
| 2 KB (1 KB used for display), exp. to 64 KB
| 8 KB, exp. to 1 [[megabyte|MB]]
|-
! Dimensions
| 8" x 10" (main board)
| 8" x 12" (main board)
|-
! Discontinued
| 1979
| 1983
|-
|colspan="3"| * A [[machine code monitor|debug monitor]] and simple [[operating system]] (OS) was included with the devices. [[CP/M]] versions 1.4, 2.2 and 3.0 were also available later.
|}