Chilton::ACL::SPROGS Technical Paper

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Applications Associates Literature Society Technology Software revisited

Early history □ Minutes of committee meetings □ Progress reports □ Other reports □ News cuttings □ In-house publications □ Committee papers □ Personal recollections □ ACL publications □ Books □ Early Atlas publications □ FR80 reports □ Atlas manuals □ ICL1906A manuals □ Other manuals and papers

General □ Applications Software Group □ Basic Software Group □ FR80 □ FR80 operations □ FR80 project notes □ FR80 technical notes □ FR80 user notes □ Graphics □ Graphics Section □ Graphics Notes □ Graphics User Notes □ PDP15 □ PDP15 Notes □ SPROGS □ SPROGS Technical Notes □ SPROGS Papers □ SPROGS Notes

SPROGS Technical Paper No 6: Bugs

G A England

1 January 1973

PURPOSE

To draw PDP 15 users attention to various bugs in and changes to the PDP15.

INTRODUCTION

H Bolas has photostated DEC software News for December and sent it to me. It will be put in the Software Summary folder in the PDP15's bookcase.

DEC have fitted a switch so that the BSI may be isolated.

The spark interferes with the display on occasions.

SOFTWARE NEWS

1. There is a bug in CHAIN VSA. Library files cannot contain BLOCK DATA subprograms. Block Data files must be specified explicitly.

2. Numbers compared by AMOD and DMOD are restricted to being less than 131072. If anyone objects to this, a new DMOD may be compiled.

3. If you write:

DO 20I=1

the wrong error message is given - the compiler thinks it is an incorrect assignment statement.

BSI SWITCH

The BSI Switch is fitted to the front of the cabinet next to the DECtapes. It is an American switch, so is on when up and off when down. No illegal interrupts have happened, so far, with the BSI switched off.

SPARK PEN

WDS, JRG and B Woodard have found that the spark pen interferes with the display on occasions, causing the picture to break up, or causing items that should not be displayed to reappear.

Similar interference with display files happens, sometimes when programs are changed, or the display is switched off.

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