Name Derived from: PC (Personal Computer) 1 (1st in Amstrad’s IBM compatible line)
512 (512kb of memory)
The original internal code name within Amstrad for the 1512 was “Airo” reputedly standing
for “Amstrad’s IBM Rip Off”.
This was intended as a joke, as it was a serious worry for Amstrad to actually not be perceived
as an IBM rip off, at the time.
The design of the IBM PC was an open one – meaning it could be built from “off the shelf”
parts.
Mainly due to the speed IBM wanted their original machine manufactured & shipped, all of the
components were available to buy as standard – i.e. no custom components.
All that is, except for the machine’s BIOS.
IBM retained the intellectual property for the BIOS, and therefore it was not possible
just to rip the chip out and use it in a rival machine.
It wasn’t even possible to look at the IBM BIOS and copy it, unless you wanted a hefty
lawsuit on your hands.
The only way to get around this was to give a specialist development team the specification
of exactly what the IBM BIOS did and then work out a way of duplicating it, using their
own methods.
This didn’t always result in 100% compatibility, but it was usually pretty darn close, especially
given the complexity of the method!
Amstrad employed MEJ Electronics to re-create the IBM BIOS, who had previously put together
the hardware for Amstrad’s CPC and PCW machines.
Amstrad had initially approached Locomotive software to take up the task (responsible
for writing the BASIC on CPC models), however, they declined due to the fear that IBM might
pull a lawsuit against them regardless.
Upon opening the IBM machine, MEJ discovered that most of the system architecture was made
up of small discreet components on a hefty motherboard – typically an expensive way
of doing things as opposed to creating custom chips, that could take up the task of many
of the smaller chips.
This confirmed to Amstrad that the machine could be produced much cheaper, and therefore
become a player in the home and small business markets.
First manufactured in 1986, the PC1512 was released after Amstrad had purchased the Sinclair
name, along with it’s line of home computers.
It also came before Amstrad’s home line; The Amstrad CPC 464, the CPC 664 and the CPC
6128 (early home computers based on the Z80 processor).
Amstrad had launched a couple of business type machines, namely the PCW 8256 and the
PCW 9512, a year earlier in 1985 – these were dedicated to word processing use, but
were affordable and filled a market gap (i.e. replacing type writers).
Alan Sugar wasn’t ever a traditional “boffin” who got into the computing industry through
passion.
Instead, he was all business (as quoted in an interview “We are business men, we’re
not made up by a team of ex-graduates who have thrown a few electronic components in
a plastic box”…
Sugar’s typical arrogant, non-shit giving, slightly ignorant and simplifying style),
and got into the computing market as it looked lucrative.
His tactic was to spot holes and try to improve on what already existed.
Building on this, the 1512 was Sugar’s attempt to create a ‘serious computer’ and break
into the IBM Compatible PC market.
The home market was no where near as strong in the UK as it was at the time in the US
and Sugar saw an opportunity to change this.
As with all Amstrad's before it, there was some quirkiness with the machine.
It also stuck to his tried and tested approach of creating something affordable, simple (i.e.
complete and easy to setup) and reasonably spec’d.
This multiple box ticking approach worked well in the UK and Europe, and as intended,
it was one of the first cheap PCs to land in this area.
The UK PC magazine PC Plus, even sold itself as for “Amstrad PC 1512 and compatibles”.
However, even though the advertising was aimed at home use, it also fared well in the office
& business sectors.
The standard machine shipped with up to two 5 1/4″ drives or an optional hard drive
alongside a 5 1/4″.
For video output, it featured an “enhanced” CGA graphic mode, which could display 640×200
pixels with 16 colors (or grey scale depending on the monitor).
The PC also shipped with 512kb of RAM (it’s in the name!) and was followed up with the
PC1640 (you can guess how much RAM was involved here) which also featured EGA compatible graphics.
Rather uniquely, the power supply for the machine was built into the monitor, falling
in line with Amstrad’s earlier CPC range.
This also meant that the cable between base unit and display was a unique, round affair
with 9 pins (with an additional 14 pin plug providing power from the monitor to the base
unit) and a different video signal type (analogue with composite sync).
Microsoft had recently overtaken Digital Research as the largest operating system supplier,
and MS-DOS was pretty standard on IBM Compatible PCs.
MS-DOS was in fact heavily based on Digital Research’s CP/M Operating System.
Sugar approached Microsoft to licence their software, but wasn’t happy with the price
offered.
This came to the attention of Digital Research, who wanted to regain ground, and they swiftly
brought all their support to the Amstrad PC with DOS-Plus.
They expected it to show the same success as the CPC and PCW series.
However, near launch, Microsoft realised how big the 1512 could be in the European markets
and revised it’s offer.
Sugar (astutely?)
decided to then also include MS-DOS on floppy (as a dual boot setup on HDD versions).
This, unfortunately, destroyed Digital Researches hopes of getting one up on Microsoft and massively
limited their progress into the markets.
Digital Research’s DOS Plus was largely compatible with MS-DOS (although in my tests,
slower), and also incorporated some features from CP/M with the additional ability to read
CP/M discs.
As well as the HDD versions having a dual boot of MS-DOS 3.2 and DOS Plus (separate
floppies on standard machines).
Amstrad shipped the machines with the Digital Research’s GEM (Graphic Environment Manager)
Window system, which was heavily based on the Apple MAC OS.
This is the same desktop that shipped with Atari ST models and had a reasonable feature
set, but never really gained traction in the market.
Accessory wise, the machine shipped with a bespoke Amstrad mouse, which was incompatible
with most software designed for the standard serial mouse.
Rather uniquely (and impressively), the keyboard had a port for an Atari (9 pin) compatible
joystick.
The movements of the joystick could be mapped to keyboard codes which allowed users to take
advantage of this control method even in games that weren’t designed to use anything other
than keyboard controls.
The monitor based power supply meant that it was difficult to expand the machine, but
also that the machine was much quieter than a typical PC of the time; the monitor allowed
for more vents and cooling, therefore a noisy fan (which they were at the time) was unnecessary.
Typically a minority of users were upset about this and complained of overheating issues
– although these were unsubstantiated, it was enough to disrupt the market share of
the machine, which had done well in home markets up until this point.
Many ignorant people had assumed that Amstrad had left out a fan to cut costs.
Alan Sugar repeatedly expressed to the press and media that it was unnecessary due to the
increased convection cooling from the monitor case and was quoted as saying;
“I’m a realistic person and we are a marketing organisation, so if it’s the difference
between people buying the machine or not, I’ll stick a bloody fan in it.
And if they want bright pink spots on it I’ll do that too.
What is the use of me banging my head against a brick wall and saying ‘You don’t need
the damn fan, sunshine?'”
I, for one, can feel his pain here!
The result of this, was that Amstrad started putting fans into HDD models shortly after,
which although ridiculous, was necessary to help stop the rumours!
It is quite likely that the rumours of unreliability were started by the IBM sales team.
A dirty tactic that IBM were already known for at the time.
As well as having a unique design, the pricing of the 1512 was substantially cheaper than
IBM machines.
The cheapest model, with a single floppy drive and monochrome display was just £399, with
the most expensive 20MB HDD model tipping the scales at £949.
In comparison, the cheapest IBM machine at the time was almost £1500, with an inferior
spec. to even the cheapest 1512.
The problem encountered by Amstrad, was that people were happy to pay for the HDD model
over the cheap version, but not enough were produced.
Combined with rumours of overheating, this lead to the 1512 not performing as well as
it should or could have.
Specification Overview
OS MS-DOS 3.2 Alongside Digital Research DOS Plus.
Also shipped with GEM Desktop (Window environment, as included with Atari ST models).
CPU Intel 8086 clocked at 8MHz Storage 1 or 2 360KB 5/14″ Floppy.
Optional 20MB HDD RAM 512KB Expandable to 640KB
Video CGA Compatible Display Monochrome (Greyscale CGA) or Colour
Sound PC Speaker Ports Atari Joystick port on keyboard, RS232c
Serial, Parallel, Mouse, Keyboard, Monitor/Power Combined, 3 Full length expansion slots accessible
via.
top back panel Other Volume Control for PC Speaker!!
I picked up my boxed, PC1512 up from eBay for the reasonable price of £49.95 (with
£16 shipping charges).
All in all, not a bad price (for eBay!).
The machine came in it’s original packaging (including poly inserts), with original software
discs, manual, keyboard and mouse.
In addition my model has been expanded to 640kb with a 30MB HDD installed – Now we’re
talking!