The technical specification of the Acorn A4: -------------------------------------------- Central processing unit: ARM3, 32 bit RISC processor with integrated 4k cache, clock rate 24MHz (6Mhz in automatic powersave mode) Memory: 2Mbyte OS ROM, 2Mbyte RAM (model I), 4Mbyte RAM (model II) - 32 bit datapath throughout, all memory directly addressable - clock rate 12Mhz (3Mhz in automatic powersave mode) Floppy disc drive: 3.5" 2Mbyte (unformatted) - 1.6M, 800k and 640k ADFS formats - 1.44M and 720k DOS formats Hard disc drive (model II): 2.5" 60Mbyte formatted internal IDE hard drive - auto-parking - automatic powersaving, software configurable spindown delay Parallel interface: Industry standard Centronics (R) compatible (25 pin D-type female) - low level bi-directional capability via OS interface Serial interface: Industry standard RS232 (9 pin D-type male, AT pinout) - 75-9600 baud via OS interface, software rate selectable Sound system: Two channel, 7 position, 8 voice, full stereo sound system - compact internal mono speaker - stereo jack socket (32W 3.5mm) Display system: Twin layer Formulated Twisted Nematic LCD display panel - fluorescent edgelighter with brightness adjustment - 640 x 480 (VGA) pixel resolution - 182 x 1377mm viewing area (4:3 aspect ratio) - 15 greyscale shades via Acorn patented greyscaling engine Industry standard video interface (15 pin VGA D-type female) - VGA, VGA+ (256 colour) and SuperVGA (800 x 600) - automatic monitor detection and identification Keyboard: Internal 83 key UK PC layout with embedded numeric keypad - full 3mm travel, force reflex curve External AT-type keyboard port (6 pin miniDIN, PS/2 pinout) Mouse: Three button ergonomically designed mouse, 200 TPI resolution Battery pack: 1800mAh rechargeable Nickel-Cadmium, solid block construction Mains supply/charger unit: Separate mains supply/charger unit - quick and trickle charge rates under control of the power management system (around seven hours to full charge) - recharge time independent of system operation - auto-ranging mains input (100-240Vac), IEC320 inlet connector Power management system: On-board independent microprocessor management of battery charging and power utilisation enables battery life of between 2.5 and 4hrs, dependent on use. - minimises power consumption, even between keystrokes - user-configurable powersave settings for display blanking and hard disc spindown delay - separate LCD five segment indicator reflects battery charge state - iconbar battery monitor provides graphical display of charge status Physical: Robust polycarbonate main unit enclosure, sub-micron copper plated with nickel overplate inside and out; 'suedecoat' epoxy resin bonded paint on external surfaces. Computer unit: 297 x 210 x 53mm, weight 2.3kg (excluding battery) Mains supply unit: 147 x 74 x 44mm, weight 420g (excluding 2m mains lead) Battery pack: 140 x 111 x 25mm, weight 720g Mouse: 100 x 60 x 30mm, weight 120g (including 1.8m lead) Environmental: Operating: +5 to +35 degrees C. 10 to 80% RH, up to 2500m altitude Non-operating: -10 to +60 degrees C. 5 to 95% RH, up to 10000m altitude Standards compliance: Designed, manufactured and type-tested to EN60950 (BS7002). Manufacturing facility registered to BS5750 part 2. ---End---