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Summary of Contents for OMNIRAM

Page 1: ...ide The edge opposite to the 100 pin S lOO bus connector is called the top and is so illustrated in all figures All of the 8 sec tions of the dip switches are numbered from the top down i e Sl l is the section of Sl closest to the top of the card Shorting of pin jumpers is accomplished with the shorting plugs supplied with the OMNIRAM The symbol which appears in the following sections indicates th...

Page 2: ...ll respond to a sixteen bit transfer request on S lOO bus line 58 by pulling 8 100 bus line 60 low and by reading or writing a sixteen bit word via the data bus lines The pins in jumper area D and E are used to select this option To select 16 bit transfers short the two pins in jumper area D and short the right two pins in jumper area E 8 bit transfers in 16 bit systems may be forced by setting th...

Page 3: ...ite into the OMNIRAM from the front panel switches short the left two pins in jumper area A To disable this ction short the right two pins in Ct_ a A The IMSAI front panel will read the contents of the OMNIRAM even if this option is disabled It is recommended that this function be disabled if operation of the front panel is not required front panel enabled A E 1 front panel disabled A BANK SELECT ...

Page 4: ...switch S4 Bank O is selected by turning ON switch section S4 1 Bank 7 is selected by turning ON switch section S4 8 A section of the OMNIRAM may reside in more than one bank This is accomplished by turning ON more than one section of switch S4 at one time The banks in which the high address section is located are selecte y switch S3 The operation of this switch is similar to that of switch S4 BANK...

Page 5: ...will not acknowledge the request on line 60 SIXTN The INTEL S6 will not make such a request The OMNIRAM has two internal data busses All of the memory chips which are addressed when AO is true are connected to one bus while those chips which are addressed when AO is false are connected to another bus A bipolar prom U22 receives as inputs board select 16 bit transfer request AO AIS and sMEMR This p...

Page 6: ... select qualifier to the board select comparitor U Use caution when removing the memory chips frcm their sockets CMOS parts are susceptible to damage from static electricity MEMORY CHIP LOCATIONS ON THE OMNIRAM BOARD FACE COMPONENT SIDE OF BOARD 3 2 1 A 8 BCD E F 1 D B C E E E E E E E E E E 0 0 0 0 54090 2 346 7 5 A 9 8 E E E E 0 0 0 0 0 a 0 000 6 7 F E E E 0 0 EVEN E MEANS AO 0 ON BYTE TRANSFERS ...

Page 7: ...1 0 BYTE WRITE ODD HIGH o 1 0 1 1 1 1 1 0 0 0 0 0 BYTE READ ODD HIGH o 1 1 0 0 1 1 1 1 0 0 1 1 WORD WRITE ODD LOW NO RESPONSE 1 0 1 1 1 1 1 0 0 1 1 WORD READ ODD LOW NO RESPONSE _L 1 1 0 1 1 1 1 0 0 1 1 WORD WRITE ODD HIGH NO RESPONSE o 1 1 1 1 1 1 1 1 0 0 1 1 WORD READ ODD HIGH NO RESPONSE 1 0 0 0 0 1 1 1 1 0 0 1 1 NO RESPONSE 1 0 0 0 1 1 1 1 1 0 0 1 1 NO RESPONSE 1 0 0 1 0 1 1 1 1 0 0 1 1 NO RES...

Page 8: ...F z J GlJ H D X either 82 83 84 85 ON OFF ON ON X ON ON ON ON X ON ON ON ON X ON OFF ON ON X ON OFF ON ON X ON ON ON ON X OFF ON ON ON X ON ON ON ON X m are as lows X e ither 81 82 83 84 85 ON OFF ON ON X ON ON OFF OFF X ON ON ON ON X ON OFF ON ON X ON OFF ON ON X ON ON ON ON X OFF ON ON ON X ON ON ON ON X 8 ...

Page 9: ...system the OMNIRAM jumper areas should be connected as follows A E J B E J C J D I C1 H J The switch settings are given below The address of the board in this X either position 82 83 84 S5 ON X X X X ON X X X X ON X X X X ON X X X X ON X X X X ON X X X X ON X X X X ON X X X X 9 ...

Page 10: ...hout front panel the jumper settings are as follows If the OMNIRAM is to be used with the IMSAI front panel the jumper settings are as follows F G i J G J H J MPUA A 8080 system with D D H ALL switch settings are inoperative when using IMSAI protocal phantom A 16 10 ...

Page 11: ... IT lIT I i i I I iLl 01 1 ITf L r 0 J I I I I ...

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Page 13: ...15 14 13 16 6 8 1 13 14 8 i i I i 9 15 fJ _ f oj t5 I I p 16 PHUA F E G ...

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Page 15: ...1 t l LJL L 13 F J f 1 I S I 13 s j RF d M58725P oPD 1 III I F 5 Col1n1dio s COM on to 0 11 581eS j FULCRUM EUROPE VALLEY HOUSE PURLEIGH ESSEX ENGLAND CM3 6QH TELEPHONE 0621 828763 oOIiOAl coooouctOl CI I I u cu uu _o _ E TI1 C Of tO IiIT 27014 REV o 12 11 10 9 ...

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