Editing Amstrad PCW (section)

====CP/M operating system and applications====
The PCW included a version of [[CP/M]] known as "[[CP/M Plus]]".<ref name="OldComputersPCW8xxx" /><ref name="Austin1989MoreThanWP" /> This provided a range of facilities comparable to those of [[MS-DOS]], but imposed a significant limitation: it could not address more than 64&nbsp;KB of RAM. Since CP/M took 3&nbsp;KB of this, the most that CP/M applications could use was 61&nbsp;KB. The rest of the RAM was used as a [[RAM disk]] (exposed under the drive letter "M:" for "memory"), which was much faster than a floppy disk but lost all its data when the machine was powered off.<ref name="Austin1989MoreThanWP" /> On the other hand, the [[standalone program|standalone]] Locoscript word processor program was able to use 154&nbsp;KB as normal memory, and the rest as a RAM disk.<ref name="OldComputersPCW8xxx" />

[[Mallard BASIC]], like  LocoScript, was a Locomotive Software product, but ran under CP/M. This version of [[BASIC]] lacked built-in graphics facilities,<ref name="Austin1989MoreThanWP" /> but included JetSAM, an implementation of [[ISAM]] that supported multiple indexes per file, so that programs could access records directly by specifying values of key fields.<ref>{{cite web|url=http://www.fvempel.nl/basic.html|title=Joyce Computer Club Public Domain - BASIC|date=April 2005|access-date=2009-05-03}}</ref> The CP/M software bundle also included the [[Digital Research]] implementation of [[Seymour Papert]]'s [[LOGO programming language]] and a graphics program that could produce [[pie chart]]s and [[bar chart]]s.<ref name="Whitehead1986ElecOfficSys" /><ref name="Austin1989MoreThanWP" />