Browse Prior Art Database

Unattended Data Card Recorder With Error Control

IP.com Disclosure Number: IPCOM000074549D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Kane, MH: AUTHOR [+2]

Abstract

This data card recorder incorporates electronic logic to record skip codes and card termination codes when recording errors are encountered which are caused by defects in the magnetic recording medium.

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Unattended Data Card Recorder With Error Control

This data card recorder incorporates electronic logic to record skip codes and card termination codes when recording errors are encountered which are caused by defects in the magnetic recording medium.

Input data is gated through AND gate 11 to read/record head 13 for recording on parallel data tracks on magnetic card 15. Card 15 is moved in the direction of arrow 17 for reading and recording operations. A track end data code, detected by reader control 19, is recorded as the last data character on a track and reader control 19 effects the stepping of head 13 from track N to track N+1 under control of step clutch control 21. Sensing of a card eject code by reader control 19 causes that code to be recorded as the last code on card 15 and effects the ejection of card 15 into stacker 23. A new card is then fed from hopper 25 and head 13 is returned to the first track position.

If a recording error is detected, error control 27 provides a signal to track link logic 29 to record a track link code as the first character on track N and reader control 19 causes head 13 to step the track N+1 for the recording of the data. If a track link code can not be recorded without error, card end logic 31 provides a signal to step control 21 to move head 13 to track N-1. Information previously recorded on track N-1 is read into line buffer 33. A card eject code is then recorded as the first character on track N-1 and reader control 19...