SET of Soviet Punch Cards (IBM 80-column), Magnetic Tape, Circuit Board MIR L32MDescription

This lot included:

• Vintage mainframe computer perforated punch cards (IBM 80-column card format) - 2pcs;
• Vintage magnetic tape (IBM 9 track format) - 3.96 meters / 156 inches / 13 feet;
• Vintage logic circuit board MIR L32M for soviet computer mainframe - 1pc.

Many years ago these punch cards, magnetic tape and circuit board were used how information carriers instead of diskette, CD/DVD and Flash drives in Soviet mainframes (series: BESM, MIR, Ural, Kiev, Dnieper, Minsk-32, and others series ES-10XX). These punch cards, magnetic tape and circuit board were created in period 1970's-1980's in USSR.

Punch cards

Speed of the Soviet punch cards reading depended on the specific implementation of the reader and ranged from 20-50 punch cards/min in the first computers and up to 2000 in newer machines such as the ES-series computers (late 70s). This performance was achieved by using several readers (readers) punch cards in parallel. Information recording ("hole punching") was performed at the rate of 10-250 punch cards per minute. Soviet punch cards made similar as IBM format and have 80 characters as standard. According to the IBM standard, each card must have size 7⅜ × 3¾ inches (187.325 × 82.55 mm), card thickness 0.007 inches (0.178 mm). Total one punch card can save only 24 machine word. One machine word had a size of 36 bits (in period time when were used the punch cards). Similar punch cards were used for first mainframes in USA (IBM series: 704/709/711/709/7094, American machines UNIVAC) and also for others computing systems. With help these punch cards first programmers wrote first programs using programming languages: Cobol, Algol, Fortran, Assembler and others.

Magnetic tape

Vintage magnetic tape reel 9-track (IBM 9 track format) ORWO GDR, width ½ inch has 9 tracks and allowe to write exactly one byte in each position of the tape (8 information bits plus 1 control), and the 9-track tape was invented and started its work together with IBM System/360. In the USSR, magnetic tapes were used with recording densities of 32, 63, and 243 bits/mm (800, 1600, and 6250 bits/inch). The tape was wound on a plastic spool (bobbin). Bobbins were made in two formats: standard coils with a diameter of 267 mm (10.5 inches) containing 730 meters of tape, reduced coils with a diameter of 178 mm (7 inches) containing 183 meters of tape.

Circuit board

This is Printed Circuit Boards (PCB) module - L32M of first very rare USSR/Soviet/Russian mainframes MIR. This is electronic assembly used as a logic element (AND, OR, NOT, XOR) for first transistorized computer mainframes in USSR (series: MIR-1, MIR-2, MIR-3). The mainframes MIR were made in USSR in 1960's and used programming languages: ALMIR-65 for MIR-1 and MIR-2 and Analitik (Analitik-74) for MIR-3. The machines MIR were a competitor for the well-known American computer "Stretch" ​​(IBM-7030), English transistorized computer "Elliot-803" and the German computer "Siemens-2002". These and similar electronic modules have been working in the Soviet industry on various computer systems until the 1980's.

Similar goods for purchase

• You can purchase perforated punch cards separately, please click buy perforated punch cards
• You can purchase magnetic tape reel, please click buy magnetic tape

100% Genuine Soviet itemsSafe and careful packaging30 days returned acceptedFast handlingCombined shipping100% Genuine Soviet itemsSafe and careful packaging30 days returned acceptedFast handlingCombined shipping100% Genuine Soviet itemsSafe and careful packaging30 days returned acceptedFast handlingCombined shippingPhotos

• Set Of Soviet Punch Cards (Ibm 80-Column), Magnetic Tape, Circuit Board Mir L32mSet Of Soviet Punch Cards (Ibm 80-Column), Magnetic Tape, Circuit Boa…Set Of Soviet Punch Cards (Ibm class="col-font-size"> Weaccept payments through PayPal (Mastercard, Eurocard, Visa, Maestro, American Express, Discover, Bank, etc. via PayPal). We are passionately wishing to deliver the goods to you as fast as possible and will always send them in no time after the transaction and being notified by PayPal.
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