Sinclair QL User Manual

.1. A pixel is the smallest area of light that can be displayed on the screen.
2. There are 256 pixel positions across the low resolution mode.
3. There are 256 pixel positions from top to bottom in the low resolution mode.
4. An address is determined by:
the up value, 0 to 100
the across value, 0 to a number computed by the system
5. There are eight colours available in the low resolution mode including black and
white.
6, i. LINE draws a line, eg, LINE a,b m x,y
ii. INK selects a colour for drawing, e,g, INK 5
iii, PAPER selects a background colour, e,g, PAPER 7
iv BORDER draws a border
e,g. BORDER 1,5
7. REPeal name .... END REPeal name.
•
•
8,
9,
A REPeal loop ferminates when an 'EXIT name' statement is executed,
Loops
in SuperBASIC have names so that it is possible to EXIT from them in a
straighrtorward
way. It is not necessary to work out line numbers in advance,
ANSWERS TO
SELF TEST ON
CHAPTER 3
11 to 13 IS very good. Carryon reading.
•
8 to 10 is good but re-read some parts of chapter three.
6 or 7 IS fair but re-read some parts of chapter three and do the test again.
Under
6, You should work carefully through chapter three again and repeat the test
CHECK YOUR
SCORE
4. Names such as wordS are sometimes pronounced 'worddollar:
ANSWERS TO
SELF TEST ON
CHAPTER 4
A character string IS a sequence of characters such as letters, digits or other
symbols,
The term, character string: is often abbreviated to 'string:
A string variable name always ends with $,
1.
5
2
3.
The keyword LEN will find the length or number of characters in a string. For
example, if the variable meatS has the value 'steak' then the statement:
PRINT LEN(meat$)
will output 5.
6, The symbol for Joining two strings is &,
7. The limits of a string may be defined by quotes or apostrophes.
•
8. The quotes are not part of the actual string and are not stored.
9. The function is CHR$. You must use it with brackets as in CHR$(66) or with brackets
as in CHR$(RND(65 m 67)
10, You generate random letters with statements like:
lettereode = RNO(65 TO 90)
PRINT CHR$(lettereode)
•
9 or 10 is very good, Carryon reading,
7
or 8 is good but re-read some parts of chapter four,
5 or 6 is fair but re-read some parts of chapter four and do the test again.
Under 5 You shourd work carefully through chapter four again and repeat the test
CHECK YOUR
SCORE
12/84
107

Sinclair QL Specifications

General

Processor	Motorola 68008
Clock Speed	7.5 MHz
RAM	128 KB (expandable to 640 KB)
ROM	48 KB
Operating System	Sinclair QDOS
Release Year	1984
Storage	Microdrive tape loop
Graphics	256x256 pixels, 8 colors
Ports	RS-232, ROM cartridge
Sound	Beeper (internal speaker)