IBM 51xx PC Family Computers / 5150 / 16-64

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Introduction

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

I had to search/wait a long time, but at the end of January 2020 I was able to buy the first 5150 board. Also included was a Tandon TM100-2A without the IBM logo.

Basics

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

Figures

IBM 5150, 16-64 KB
IBM 5150 (IBM PC), 16-64 KB, mainboard, Super PC BIOS v3.1

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

What stands out immediately? I changed the BIOS here once. Why? It's kind of annoying when you don't see anything at boot time and wait and wait.

Super PC/Turbo XT BIOS v3.1
Super PC/Turbo XT BIOS v3.1

I used the Super PC/Turbo XT BIOS v3.1 from Plasma (Jon Ρetrosky and Ya'akov Miles). Note: The cassette functions do NOT work with the Super PC BIOS! Since my GALEP-5 works fine with the Motorola MCM68764, I used this EPROM. Otherwise you have to use a 2764-27512 EPROM with adapter.

IBM 5150, 16-64 KB
IBM 5150 (IBM PC), 16-64 KB, RAM

All banks (0-3 with parity) are completed with 4116 class RAM chips (200 ns). The mainboard works perfectly. Note: These 4116 RAM chips absolutely need -5V from the power supply! Therefore you can not test these chips with „normal“ RAM testers; they do not have -5V.

  1. 8+1 / MOSTEK MK4116N-3GP / 16 KByte (soldered)
  2. 8+1 / MOSTEK MK4116N-3GP / 16 KByte
  3. 8+1 / MOSTEK MK4116N-3GP / 16 KByte
  4. 8+1 / MOSTEK MK4116N-3GP / 16 KByte

The tantalum capacitors are also working perfectly so far; round about 40 years. Unlike the „64-256“, the „16-64“ has two tantalum capacitors at each bank. So the two boards can be easily distinguished, if you can not read the the appropriate label.