16K Dynamic RAM Manual - PolyMorphic
Contents
1. x x X Xx x x X x X X Xx x X X X x x x x XxX X x X X X X X X x X If addressed higher than C000H the memory above FFFFH will appear in the lower end of the address space If set at E000 it will appear at EQOO FFFFH and 0000 1FFFH The RAM card may now be plugged into your system backplane Consult the user s manual for your computer for card insertion instructions SPECIFICATIONS Memory Size Access Time Cycle Time Wait States Power Consumption Card Size 16 384 Bytes 375 nS from 01 525 ns 0 16 to 20V 200 mA max active 16 to 20V 90 mA max standby 8 to 10V 600 mA max 16 to 20V 24 mA max 5 5 x 102. 16K Ram PolyMorphic Systems 460 Ward Drive Santa Barbara Colifomia 93m 805 967 2351 This manual is PolyMorphic Systems part no 810119 Copyright 1977 Interactive Products Corporation Card Revision C Page 1 16K RAM Card Operation PolyMorphic Systems The PolyMorphic Systems 16K RAM card provides 16 384 bytes of read write storage The card uses proven 4K dynamic RAM chips and provides transparent refresh circuitry onboard no wait states Each card has been tested for 72 hours before shipment This includes 48 hours of GALPAT and checkerboard testing at high temperatures with no errors This card should provide years of trouble free service in your 8080 based S 100 system THEORY OF OPERATION Refresh cycles are inserted during the T4 state of the Ml cycle of the 8080 central processor or during a hold or halt state of more than 15 cycles Memory read cycles are initiated by the coincidence of the phase 1 clock PSYNC and DO7 MREAD staus Write cycles are initiated by the leading edge of MWRITE If the card is used with systems using DMA Direct Memory Access the DMA controller must provide the proper status bits on the DO bus during SYNC time The bus timing must match that of an 8080 processor Contact the manufacturer or distributor of the DMA controller before attempting to use the 16K RAM card with a DMA device ADDRESSING Consult the user s manual for your computer to determine the correct address for t
3. his memory card For POLY 88 or System 88 computers the card should be addressed just above the present top of memory If your system uses only 16K cards the first card should be addressed at 2000H the second card at 6000H and the third card at AOOOH The 16K RAM card may be addressed to any 4K boundary within the 64K address space of the S 100 bus and will occupy the next 16K bytes of storage space If addressed at 2000H the RAM will occupy 2000 5FFFH The address switches are located in the lower left corner of the card Up to seven switches may be present but only the top four are used These switches are numbered 1 through 4 from the top of the card The switch settings for various addresses are given below Rocker switches are ON when the on or plus side of the rocker switch is pressed down For purposes of reference note the numbers down one side of the card and across the top These numbers indicate the ad dresses of the memory chips within the 16K block Numbers down the side indicate byte address row 0 on the card is addressed in the first 4K of the block row 1 in the next and so on Numbers across the top correspond to the bits in each byte Column 0 contains the first bit in every byte column 1 the second etc Page 2 16K RAM Card Operation PolyMorphic Systems Switch Settings X on blank off Address 0000 1000 2000 3000 4000 5000 6000 7000 8000 9000 A000 5000 C000 Bodo E000 F000 1 2 3 4 Xx x
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