AMSTRAD cpc 6128 User Instruction page 317

Value Name Parameter
Meaning
&1B 27 ESC No effect. Ignored.
&1C 28 FS Oto 15 Set Ink to a pair of colours.
Oto31
Equivalent to an INK command.
Oto31
The first parameter (MOD 16)
specifies the Ink, the next two
(MOD 32) the required colours.
(Parameter values 27 to 31 are
un-defined colours.)
&1D 29 GS Oto31 Set Border to a pair of colours.
Oto31 Equivalent to aB 0 R D E R command.
The two parameters (MOD 32)
specify the two colours.
(Parameter values 27 to 31 are
un-defined colours.)
&1E 30 RS Move cursor to top left hand
corner of window.
&1F 31 US 1 to80 Move cursor to the given
1 to25 position in the current window.
Equivalent to a LO CAT E command.
The first parameter gives the
column to move to, the second
gives the line.
The housekeeping of the 6128 is provided by a sophisticated real time operating
system. The operating system 'directs the traffic' through the computer from the
input to the output.
It primarily interfaces between the hardware and the BASIC interpreter - for
example the ink flashing function, where BASIC passes the parameters - and the
operating system gets on with the task, with one part determining what is required
- and the other part determining the timing of these events.
The machine operating system is generally referred to as the 'firmware', and
comprises the machine code routines that are called by the high level commands in
BASIC.
Chapter 7 Page 6
For your reference ....