IBM 51xx PC Family Computers / 5150 / 64-256
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Introduction

To be continued ... but if you follow this link you will find "almost" everything about the IBM XT 5150.

Basics

Please read this first: IBM 5150 - Basics, for 5150 beginners (minuszerodegrees.net).

Figures

IBM 5150, 64-256 KB
IBM 5160 (IBM PC), 64-256 KB, mainboard
IBM 5150, 64-256 KB
IBM 5150 (IBM PC), 64-256 KB, Intel 8088

In the meantime I exchanged the i8088 for the NEC V20. So far I didn't see any problems. On the contrary, the NEC V20 even runs the terminal program TERM95 from the Norton Commander package! With the i8088, however, TERM95 cannot be started.

In contrast to the 5160, the 5150 has a cassette interface (2nd DIN plug from above). Below is the white relay for the cassette interface. You can hear it (slight crackling) when you copy files from/to the cassette recorder.

IBM 5150, 64-256 KB
IBM 5150 (IBM PC), 64-256 KB, BIOS
IBM 5150, 64-256 KB
IBM 5150 (IBM PC), 64-256 KB, RAM

All banks (0-3 with parity) are completed with 4164 class RAM chips (150 ns, 128 cycle/2ms). The mainboard works perfectly.

  1. 8+1 / OKI M3764A-15 / 64 KByte (soldered)
  2. 8+1 / OKI M3764A-15 / 64 KByte
  3. 8+1 / OKI M3764A-15 / 64 KByte
  4. 8+1 / Fujitsu MB8264A-15 / 64 KByte

The tantalum capacitors are also working perfectly so far; round about 40 years.