12    DATA ARRAY FILES

The  SOS syntax for LOADing or SAVEing a non string array entitled
Money is:
     LOAD "Money"DATA M() or
     SAVE "Movey"DATA M()

For a string array the addition of $ is required, eg:
     LOAD "Money"DATA M$()

Like most of  the TRDOS commands  the LOADing and  SAVEing of data
arrays is achieved by  using SOS  Basic syntax  with a  prefix and
possibly  a  drive  indicator. It  is seldom  that data arrays are
likely to be handled from TRDOS.

The  nature of the arrays is such that they will be saved from and
loaded to a running program. The SOS syntax for use within a BASIC
program would be:
     RANDOMIZE USR 15619: REM: LOAD "Money"DATA M() or
     RANDOMIZE USR 15619: REM: SAVE "Money"DATA M()

Note:  This syntax assumes that the  default drive is either fixed
as drive A. If you have a twin drive system, the alternative would
be  to assume that  the data disk  is always loaded  into the same
drive, say  B whilst the main program  and default drive remain in
A. In this case a temporary drive indicator would be used, eg:
     RANDOMIZE USR 15619: REM: LOAD "B:Money"DATA M()

When COPYing, ERASEing,  or NEWing  a DATA  file the  command must
always  terminate with the designation of the file type, i.e. DATA
otherwise TRDOS  will assume that it is  looking for a BASIC file,
eg:
     COPY "a:Money"DATA, "B:Money"DATA

13.2 Sequential files

A  sequential file may be opened either  for Write or Read but not
both at the same time. To open a file for Write the syntax is:
     OPEN stream_number, "filename",W

When a stream is open for Write the BASIC keyword PRINT is used to
WRITE data to that stream, eg:
     10 LET DOS = 15619
     20 RANDOMIZE USR DOS: REM: OPEN #4, "TEST",W
     30 PRINT #4; "This is a test line"
     40 RANDOMIZE USR DOS: REM: CLOSE #4

Notice the use of "DOS" instead  of  typing  in  "15619"  and  the
closure of the file.

Border (BXX)
Примерно то же самое, что и мультиколор, но для области вокруг экрана – бордюра. Программно задавая цвет бордюра на стандартном ZX Spectrum можно использовать цветные полоски минимального размера 24x1 пиксель для рисования в области бордюра. Более подробно это будет освещено в отдельной статье.