            CP/M VERSION 2.2

CP/M    2.2   provides   the   following 
enhancements over CP/M 1.4: 

  1.  Improved    BDOS   functions   and  
      in   particular    support     for  
      Random    Access  Files   accessed 
      using machine code programs.

  2.  File    attributes   for    access 
      (read/write and read only) and for 
      disclosure    (hides  files   from 
      directory  listings when using the 
      DIR function and SYS attribute).

  3.  Division  of disc directory   into  
      16 user areas. 

  4.  V24 (RS232C) serial input as  CP/M 
      logical device RDR. 

  5.  Fast  disc-to-disc copying utility 
      (FASTCOPY).

  6.  Simplified creation and copying of 
      CP/M    system    disc     utility 
      (COPYSYS).

Compatibility with CP/M 1.4

CP/M  version 2.2 is upwards  compatible 
with version 1.4.   However, version 2.2 
occupies 1K bytes more than version 1.4.  
Consequently,  the  space available  for 
user  programs  in the TPA is  1K  bytes 
less.   This  reduction may cause  large 
programs  that run under version 1.4  to 
be too large to run under version 2.2.

In  order  to read files  created  under 
version  2.2 with a version 1.4  system, 
files should be created with the default 
attribute  settings of 'Read/Write'  and 
'DIR'. These files should also be stored 
in USER 0. 

After reading this Release Note,  please 
read  the  description in the 380Z  Disc 
System  User  Guide,   PN  10915  or  in 
Technical  Information  Brief Number  2, 
PN 10919, on copying a CP/M system using 
COPYSYS.    When  you  have  created   a 
working system disc you should lock your 
MASTER   DISTRIBUTION  DISC  in  a  safe 
place. 




