Maxc OperationsLocal Memory Chip Charts6718. LOCAL MEMORY CHIP CHARTSThe most common cause of hardware problems in Maxc is failure of the storage chips used in theprocessor's local memories (LM, RM, IM, SM, DM, and MAP). Once the addresses and bitnumber(s) of the failures have been determined (by means of the micro-diagnostics DGRL orDGIML/DGIMH), the chips may be located by means of the information in this section.The chips used in LM and RM are either Intel 3101A or TI 74S289, which are 16-word by 4-bitmemories. They are located on the three ALUA boards, each one of which provides a 12-bit sliceof the 36-bit Maxc ALU. In the following table, the top three rows show the card slot number as afunction of the machine and bit number, and the main matrix below it yields the chip position onthat card as a function of the memory name and address within the memory.CardBitsSlot2/230-34-78-11Memory &2/2112-1516-1920-23Address2/1924-2728-3132-35LM 0-17442464LM 20-37452565RM 0-17553575RM 20-37543474Figures 1, 2 & 3 in the Appendix show the storage chip layouts for the old and new bipolar memorycards used in the microprocessor. Old bipolar cards are used in only the MAP slot; new bipolarcards are used in all other positions.If it is necessary to replace an entire card, one should be aware that not all the bipolar cards aredirectly interchangeable. In particular, old bipolar cards in four of the IM slots have had pullupresistors removed and cannot be interchanged with cards in the other slots. New bipolar cards usedin IM slots have different pullup resistor chips (680 ohms) than are used in SM/DM slots (330ohms); these must be changed if cards are substituted.î ·ïfªpôiî4ÇqôXîFùpîýï_£rî ·ï\1sô—ð!ô˜ð=î ·ïZfôÒôÓð6î ·ïXœôÐð2ôÑð'î ·ïVÑô€ðSî ·ïS_ô¤ðUô¥î ·ïQ”ô”ð-ô•ð2î ·ïOÊô…ð>ô†ð$î ·ïMÿô–ð;ô—ð%î ·ïL5ô€ðIî! ïHÃî(`î! ïFøî! ïC†î(`î-äî5âî~ïA¼ôXî! î(`î-äî5âî~ï?ñî! î(`î-äî5âî~ï<î(`î-äî5âî~ï:´î(`î-äî5âî~ï8êî(`î-äî5âî~ï7î(`î-äî5âî ·ï3­rô‚srsrsrsðAî ·ï1ãô›ð4ôœð,î ·ï0ô€ð&î ·ï,¦ô¢ô£ð_î ·ï*Ûô¦ð)ô§ð:î ·ï)ô†ðPô‡î ·ï'Fô·ðRô¸ î ·ï%|ô€ð7ÿ” ·%5=çBÖï TIMESROMAN  TIMESROMAN  TIMESROMAN  TIMESROMAN ÿÿj/—ý²,ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿMaxcOps18.BravoRWeaverOctober 21, 1981 10:23 AM