SECTION D. MEMORY IDENTIFICATION TABLE

SOME TRAP ERRORS HAVE BEEN CAUSED BY INCORRECT MEMORY BEING USED. THE TABLE BELOW GIVES THE MANUFACTURING P/N'S, RESISTORS PRESENT AT THE TOP RIGHT (IBM MANUFACTURED) OR MANUFACTURER CODE MARKING ON THE SIMM CASING MADE BY VENDOR FOR THE DIFFERENT SPEEDS AND SYSTEMS WHERE USED.

P/N23F9779 IS THE IBM MANUFACTURED 100NS MEMORY AND IS RECOGNIZED BY THE R1 AND R2 RESISTORS AT THE TOP RIGHT. P/N68X6254 IS THE VENDOR MANUFACTURED EQUIVALENT AND HAS ONE OF THE MARKINGS. EITHER ONE CAN BE USED IN THE 8570 16MHZ OR 8555.

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PART NUMBER | SPEED |     MARKINGS             | WHERE USED
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23F9779(IBM)| 100   | R1 AND R2 RESISTORS      |  8570 16MHZ
____________|       |__________________________|
68X6254(OEM)|       | MSC2321-10YS18A          |     AND
            |       | HB56D512361B-10          |
            |       | MH512361B-10             |    8555
            |       | ZA3617                   |
            |       | THM265102S-10            |
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65X6249(IBM)|  85   | ONLY R1 RESISTER         |  8570  20MHZ
____________|       |__________________________|  8555
68X6127(OEM)|       | MNB36512S85              |  8570  16MHZ
            |       | THM365120S-85            |  OPTION
            |       | MSC2321-85YS18A          |  6450605/9
            |       | HB56D512361B-8           |
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68X5806(IBM)|  80   | ONLY R2 RESISTOR         |  8570-A21
            |       |                          |  8570-R21
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[Back: SECTION C. TRAP NUMBER TABLE.]
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