RCA 301 Programmer's Reference Manual
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Sixteen-Magazine Retrieval Unit681.6 Million CharactersMnrfpl .1488-1 FilfiR/W StationRead/WriteHeadAssembly\D8-10 ms —ZonePhotocell1 fModel 3488-2File Expansion AssemblyMagazines 0-7 Magazines 8-151 I ICard (Feed) Transport Mechanism< «Gate Card (Return) Transport Mechanism.Card ReplacementEntry SlotCard Removal•Dummy MagazinePositionFigure 2Card FormatBands — Each 3488 card contains 128 tracks, each of which runs the full length of approximately 14.5 inchesof recording area on the card. The 128 tracks are divided into 64 separately addressable bands of 2 tracks each.Characters are recorded bit-serial per track. Two tracks are recorded in parallel, each at a density of 700 bits per inch.Blocks — Each band (two tracks) of recorded information is divided into 4 blocks of 650 7-bit characters each.The capacity of the 3488-1 along with the expansion assembly are included below.UNITBlockBand (4 Blocks)Card (64 Bands)Magazine (256 cards)Retrieval Assembly (8 magazines)Retrieval Assembly Plus Expansion Assembly (16 magazines)NO. OF SEVEN BIT CHARACTERS6502600166,40042.6 million340.8 million681.6 millionControlThe Model 380 channel acts as the interface between a 301 Processor and up to four Model 3488 random accessunits. Two Model 380 channels can be used in each 301 System.The channel permits one-way transfer of data between one of four random access units and the 301 Processor.The channel enables selection and reading/recording of magnetic cards contained in a random access unit, underprogram control. Character parity checking and character buffering are performed in the channel.The Control includes the addressing registers, decoding circuitry, necessary control interface, and buffering.11-10 |
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