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The Colour Plotter
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EN
ES
Contents
Introduction
A bit of history
Lesson 1. The plotter and the panel
1.1. Idea: two axes — any point of the sheet
1.2. Idea: an arrow means steps from a clock
1.3. Idea: PEN UP/DOWN — one button, two positions
1.4. Idea: ERROR
1.5. Build
1.6. Check
Lesson 1 paste (Cmd+I)
Lesson 2. The turret: four pens
2.1. Idea: changing the pen means turning
2.2. Idea: the motor is two flip-flops in a ring
2.3. Idea: a quarter turn = 6 steps
2.4. Idea: two two-bit counters
2.5. Idea: turn until they match
2.6. Idea: BUSY — the pen is up while turning
2.7. Idea: which pen to lower
2.8. Build
2.9. Check
Lesson 2 paste (Cmd+I)
Lesson 3. The card in the slot: the computer draws
3.1. Idea: the card has three addresses
3.2. Idea: the decoder — «no bit differs»
3.3. Idea: writing to a register
3.4. Idea: reading $C091 — onto the same bus
3.5. Idea: who drives — the CD4019
3.6. Build
3.7. Check
Lesson 3 paste (Cmd+I)
Lesson 4. A program with a menu: seven pictures
4.1. Idea: the whole program is three addresses
4.2. Idea: «home» by the limit switches (lines 900–940)
4.3. Idea: a straight line from steps (lines 1000–1090)
4.4. Idea: colour and waiting (lines 1300–1330)
4.5. Idea: a picture is a table in DATA (lines 1500–1570, 3000…)
4.6. How to run it
4.7. Check
The whole PLOTTER program
Summary
All the parts
Instructions in pictures
Lesson 4 in pictures
← Back to the lesson: Lesson 4. A program with a menu: seven pictures
4
A program with a menu
the PLOTTER4 disk: seven pictures
kh
HT-06
COLOR PLOTTER
1 HOUSE 5 SPIRAL
2 RAINBOW 6 HELLO
3 FLOWER 7 SPIROGRAPH
4 STAR 0 EXIT
PICTURE: 7
© 2026 Daniil Khanin · khanin.info · HT-06
31
CANVAS
1
disk drive ⬆ → PLOTTER4.dsk
2
PLOTTER4.dsk
Disk II ⬆
3
REMOTE on, speed MAX
4
]RUN PLOTTER
PICTURE: 1
PUT A NEW SHEET, PRESS RETURN
1 house
2 rainbow
3 flower
4 star
5 spiral
6 HELLO
7 spirograph
© 2026 Daniil Khanin · khanin.info · HT-06
32
← Back to the lesson
Lesson 4. A program with a menu: seven pictures