IBM Memory Expansion Boards

IBM 64KB Memory Expansion Option 

  • Placed in IBM PC 5150 rev. A #2
  • IBM Part Number: 1806823 XM
  • Manufactured Date: 44/81 (last IC)

IBM 64KB Memory Expansion Option #2

  • Placed in IBM PC 5150 rev. A #1
  • IBM Part Number: 1806823 036 XM
  • Manufactured Date: 5281 (last IC)

IBM 64KB Memory Expansion Option #3

  • Not Placed
  • IBM Part Number: 1806823 XM
  • Manufactured Date: 05/82

IBM 64/256KB Memory Expansion Option #1

  • Not Placed
  • IBM Part Number: 1803816 XM
  • Manufactured Date: 29/82

IBM 64/256KB Memory Expansion Option #2

  • Not placed
  • IBM Part Number: 6449021 XM
  • Manufactured Date: 4/84
  • Now full 256kb RAM installed

IBM 64/256KB Memory Expansion Option #3

  • Placed in IBM PC XT 64-256k
  • IBM Part Number: 1501989 XM
  • Manufactured Date: 31/83

IBM 64/256KB Memory Expansion Option #4

  • Not placed
  • IBM Part Number: 1501989 XM
  • Manufactured Date: 1983

IBM 128KB Memory Expansion Option

  • Placed in IBM PC AT Model 099
  • IBM Part Number: 1503087
  • Manufactured Date: 40/85

IBM 512KB Memory Expansion Option

  • Placed in IBM PC AT Model 099
  • IBM Part Number: 1501516
  • Manufactured Date: 07/84 (PCB) April 11, 1985 

IBM 128KB/640KB Memory Expansion Option

  • Placed in IBM PC AT Model 319/339
  • IBM Part Number: 62X0780
  • Manufactured Date: 51/86

IBM 512KB/2MB Memory Expansion Option 

  • Placed in IBM PC 5162
  • IBM Part Number: 6450343
  • Manufactured Date: 45/88

IBM 256KB Memory Expansion Option

  • Placed in IBM Portable PC 5155
  • IBM Part Number: 6407740
  • Manufactured Date: 24/84

Microsoft PC RAMCARD


Box of 41128 DRAM chips for IBM PC AT model 099