https://glaschick.de/rclab/ 2026-06-12T08:23:27+00:00 https://glaschick.de/rclab/ https://glaschick.de/rclab/lib/tpl/dokubook/images/favicon.ico text/html 2019-01-07T16:04:26+00:00 Anonymous (anonymous@undisclosed.example.com) https://glaschick.de/rclab/lgp30/inhalt?do=revisions&rev=1546873466 LGP-30 Der Laborrechner LGP-30 (LGP-30) war ein früher, preiswerter Rechner für wissenschaftliche und technische Anwendungen. Es ist derzeit nur die englische Beschreibung verfügbar. text/html 2018-01-15T21:57:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://glaschick.de/rclab/lgp30/instrcrit?do=revisions&rev=1516049861 Remarks on the instruction set In the hindsight, the instruction set might be desinge slightly different. Load and Store As the machine has a deposit and clear accumulator ( C ) instruction, the B (bring) instruction is dispensible, as the same can be achieved by adding the memory to the cleared accumulator (see text/html 2018-01-15T09:46:25+00:00 Anonymous (anonymous@undisclosed.example.com) https://glaschick.de/rclab/lgp30/loaderinput?do=revisions&rev=1516005985 Programs for the LGP-30 were written using coding sheets, where comments could be added. Unfortunately, the library of subroutines is available only as tape images and documentation on paper. The tape images, althogh plain text, are practically incomprehensible without entering them into coding sheets, or applying similar techniques. Using legacy coding sheets seems unefficient, and there should be a better way to write down LGP-30 progammes. text/html 2018-01-15T10:22:38+00:00 Anonymous (anonymous@undisclosed.example.com) https://glaschick.de/rclab/lgp30/newbies?do=revisions&rev=1516008158 LGP-30 Hints and Tips * The Flexowriter used as input and output device does not have a key for the digit 1; as with many early cheap typewriters, the small letter l is used. Unfortunately, many tapes, translated to ASCII, do not map to the digit 1. * Designed for scientific and technical cacluations, the data word is a 31-bit fixed point fractional number, i.e. representing numbers from -1 .. +1, both excluded. There is a 32th bit at the least significant position, which is always zero, s… text/html 2018-01-16T17:58:48+00:00 Anonymous (anonymous@undisclosed.example.com) https://glaschick.de/rclab/lgp30/samples?do=revisions&rev=1516121928 Small Programmes Blanks are significant if among the last 8 characters before a tick, see proposal for formatting and comments Test halt on overflow As it is rather unusual that the machine stops on overflow, here is a small test program: halt on overflow ;zzz0700' /zzz0700' 00 b0016' get start 01 a0017' stops if overflow u0001' loop variables: ;zzz0716' ,zzz0002' 16 7ww00000' start 17 00002000' increment go .zzz0700'