ScuzzBlog: Diaries October 2017
Entry 18th October 2017: Post: 1
Just received Amstrad Action Pack Tape 9 featuring the very wonderful
RSX-Lib including RSX routines from Smogware Systems.
For this you will need to know the command 'Shift + AT' as in the 'at'
symbol for email [ I am unable to enter the symbol in html as it will
be interpreted as an actionable email ]
RSX extend the command set of Locomotive BASIC, i.e. for accessing
external peripheral devices such as disk drives, light pens,
RSX commands are distinguished by the preceding pipe symbol "|"
( "RSX bar", "RSX pipe" and "RSX slash").
These provide some of the best RSX commands provided by AMSDOS,
present on all CPC664, CPC6128, CPC6128+ and CPC464 with DDI-1:
Makes drive A: the current work drive
Makes drive B: the current work drive
Starts CP/M (or other systems) from a system disk
Switches back to disk drive use after |TAPE
Makes the CPC use the tape recorder for file access
See AMSDOS RSX commands for AMSDOS.
RSX command extensions can be implemented through ROMs
(i.e. AMSDOS and other disk operating systems). They
can also be implemented by programs.
;; This program provides the framework for the installation of a Resident System
;; Extension (an RSX).
;; An RSX is a command which is accessed from basic by prexifing the command
;; with the '|' symbol.
;; e.g. An RSX could provide a "MEMEDIT" command, which allows the user
;; to edit the RAM contents. It would be accessed from BASIC by typing:
;; This program shows how an RSX is set up. You are free to use this
;; example code to create your own RSX's.
;; Kevin Thacker 1993
Read ... Rsx - Anatomy Of An Rsx - Part 1|Amstrad Action) by David Holmes.
[ quote ]
One of the most powerful features of the Amstrad CPC is its ability
to develop Resident System Extensions (RSXs), machine code routines
which can be installed in the memory and then used and handled as
It is possible to write simple routines which add to or modify the
existing commands supplied in the BASIC interpreter or to create
sophisticated systems which can be accessed easily from within a
Quite professional results can be obtained with very simple code
which can then be developed as the programmer's expertise increases.
The major advantages of the RSX over CALLing machine code routines
are the error checking on the command name done by BASIC and the
increased readability of programs using RSXs.
[ end quote ]
See also .
BIOS Kernel RSX Functions (Resident System Extensions)
Installing RSX Functions (defined in Expansion ROM or in RAM)
Using RSX Functions
Executing RSX Functions in Machine Code
Executing RSX Functions in BASIC