ARM (Acorn Risc Machine)
Clock Frequency 4 / 8Mhz
A305 - 0.5Mb
A310 - 1.0 Mb
A410 - 1.0Mb
A440 - 4.0Mb
Seperate CMOS battery backed RAM : 240 bytes, plus 16 for battery backed real time clock.
Machine Operating System (ARTHUR)
(Followed by Risc OS 2 and)
(Later Upgradable to Risc OS 3)
BBC BASIC V
Advanced Disc Filing System (ADFS)
Advanced Net Filing System (ANFS)
Desk Top Manager
Character Sets: ISO 8859, Latin 1-4, Greek.
European Standard Rate (15.625Khz/50Hz non-interlaced)
18 Screen Modes;
High Scan Rate: for use with monitors such as the NEC Multisync;
3 Screen Modes;
Outputs: Analogue RGB + sync; 9-pin D type socket; monochrome composite video; phono socket.
2 channel Stereo with 7 Stereo positions and 8 voices; 1 internal loud speaker, 3.5mm stereo jack for use with 32ohm stereo headphones or amplifier.
All machines fitted with one 1 Mbyte (unformatted) 3.5" drive. An additional 3.5" disc or 20 Mbyte hard disc may be added internally. The 300 series also requires a hard disc controller podule and back plane when fitting a hard disc.
75-19200 baud software selectable; independant Rx/Tx baud rate selectable; 9 pin D-type plug.
8 bit Centronics compatible; 25 pin D-type socket.
103 key 'enhanced PC' style; two-key roll-over with programmable auot-repeat rate; detachable via 6-pin minature circular connector; Mouse input, 3 button mouse included, via 9-pin minature circular connector; adjustable function key card holder.
Welcome Suite - Painting Program, Font Designer, Music Program, tutorials, utilities, 6502 Emulator, Floating Point Emulator, range of Fonts.
Documentation; Welcome Guide, User Guide.
64 way DIN 41612 connector on main PCB; designed to accept 2 socket optional back plane card.
All machines may be upgraded to work with the ECONET Local Area Network by the addition of an internal plug-in module.
198 to 264V AC (50Hz)
Computer Unit: width: 362mm; depth: 406mm; height: 97mm (excluding feet)
Keyboard Unit: width: 485mm; depth: 205mm; height: 46mm (excluding feet)
(Input Output Interface to support many existing BBC applications).
Double Width. Provides User Port, 1Mhz Bus and A-D Port, similar to those provided on the Master 128 including the connector types. Previous Master 128 Operating System calls are genreally supported.
MIDI * (Musical Instrument Digital Interface)
* (Where Purchased)
Two kits will be available to upgrade the model 305 0.5 Mbyte RAM to 1.0 Mbyte, and the model 410 1.0 Mbyte RAM to 4.0 Mbytes.
* (Dealer Fitting Only)
Source of information: Official Acorn Product Brochure.
Front view of an Archimedes A310. This machine has a hard disc and hence the hard disc activity
light on the front panel. A non hard disc machine has this light omitted.
The design in my opinion is flawed, as to upgrade a non-hard disc machine to hard disc or to add a
second floppy drive involves fitting a new front panel moulding. A better option would have been a
removable panel for the second floppy drive and the hard disc activity light pre-installed.
A view inside this machine. The Hard Disc in center front is a SCSI device, popular at the time.
This is the Acorn SCSI Hard Disc controller podule.
A view of the User, Analogue, 1Mhz Bus, Midi podule. This is an excellent upgrade as it gives the
A310 nearly all the ports required for backward compatability with the BBC Micro range of machines.
A view of the Watford Electronics 4-Slot backplane.
A view of the front panel. Note the Hard Disc activity light.
Also, note the small square panel to the left of the Archimedes Logo.
I believe this was originally designed for a front mounted power on/off switch.
A rear view of the same panel showing possible fixing points for a on/off switch.
A view of the A310 mainboard. This machine also has an Econet Module fitted.
A closeup view of the mainboard.
Note, the apparent possible upgrades ie vacant positions for Winchester Disc Upgrade.
Did this ever become a production option? I believe the A540 had SCSI as standard.