Atari CX70 Documentation

The Atari CX70 documentation below is the operator's manual for the Atari CX70 Light Pen.

Atari Light Pen Operator's Manual

The Atari Light Pen Operator's Manual, model CX70, is Atari, Inc.'s manual C016367 Rev. 1, © 1981, for use with the Atari 400 and Atari 800. The hosted scan has 68 PDF pages: the cover, the title and copyright page, the contents and list of illustrations, and 64 numbered pages. Printed page n is PDF page n + 4. The scan has a text layer, but its OCR is unreliable in places, particularly in the program listings.

Contents

Section	Printed page	PDF page
1. Introduction	1	5
2. Possible uses of the light pen	3	7
3. Connecting the light pen	5	9
4. Atari Light Pen demonstration program cassette (loading, 8K and 16K PALLET)	7	11
5. Programming example 1: using the light pen with Atari BASIC	29	33
6. Programming example 2: using PENBUF	33	37
7. Programming example 3: a keyboard substitute	37	41
8. Programming example 4: a teaching aid	39	43
9. Periodic maintenance	43	47
A. Basics of light pen operation	45	49
B. Atari Light Pen characteristics	49	53
C. Troubleshooting	51	55
D. PENBUF flow chart	53	57
E. PENBUF assembly language listing	55	59
F. Description of PENBUF operation	57	61
G. Notes on memory conservation and PENBUF memory usage	61	65
H. General programming notes	63	67

What this manual does not contain

• A schematic, parts list or any electrical specification of the pen. It names the phototransistor in the tip (p. 43) but gives no part number.
• Service or disassembly information. Appendix C tells owners not to take the pen apart and to refer repairs to an Atari Service Center.
• The cassette itself; its PALLET programs are described in section 4.

Appendix A (p. 47) prints a horizontal correction (add 154, subtract 128 if the reading is below 10) that does not agree with line 40 of programming example 1 (p. 29), X=Q+154-228*(Q>10). The program line gives the 0 to 159 range that the appendix describes.

Pages that cite this manual

• Atari CX70: how the pen works, register addresses and value ranges, connecting, the demonstration cassette, care, the test program and the troubleshooting checklist

Download: Atari CX70 Light Pen Operator's Manual C016367.pdf