Introduction
Basics
Please read this first: IBM 5160 - Basics, for 5160 beginners (minuszerodegrees.net).
Figures
All banks are completed with 4164 class RAM chips (150 ns, 256 cycle/4ms). The mainboard works perfectly
- 8+1 / Texas Instruments TMS4164-15 / 64 KByte
- 8+1 / Texas Instruments TMS4164-15 / 64 KByte
- 8+1 / Texas Instruments TMS4164-15 / 64 KByte
- 8+1 / Texas Instruments TMS4164-15 / 64 KByte
The working unit has 256+384 KByte RAM, a IBM WD25 (20 MByte) harddisk and two floppy disk drives (360 KBytes). The hard disk drive controller is a XEBEC (62X0786).
The memory expansion card is from Quadram, namely the short version. As far as I know, there is no documentation on this short card on the Internet.
Upgrading to 640 KB
One of my next projects will be to upgrade the mainboard of my 64-256 KB (5160) to 640 KB.
!!! WARNING !!!
I EXPLICITLY WARN YOU THAT YOU MAY PERMANENTLY DESTROY YOUR MAINBOARD IF YOU MAKE ANY TECHNICAL CHANGES TO IT. I DO NOT ACCEPT ANY RESPONSIBILITY OR LIABILITY WHATSOEVER IF YOU CARRY OUT MODIFICATIONS TO YOUR MAINBOARD ON THE BASIS OF MY DESCRIPTIONS. IF YOU MAKE ANY MODIFICATIONS TO YOUR MAINBOARD, YOU DO SO AT YOUR OWN RISK. EVEN TOUCHING SENSITIVE COMPONENTS SUCH AS CPU, RAM, ... CAN CAUSE THEM TO BE IRREVOCABLY DESTROYED (ELECTROSTATIC DISCHARGE - ESD).
!!! WARNING !!!
I EXPLICITLY WARN YOU THAT YOU MAY PERMANENTLY DESTROY YOUR MAINBOARD IF YOU MAKE ANY TECHNICAL CHANGES TO IT. I DO NOT ACCEPT ANY RESPONSIBILITY OR LIABILITY WHATSOEVER IF YOU CARRY OUT MODIFICATIONS TO YOUR MAINBOARD ON THE BASIS OF MY DESCRIPTIONS. IF YOU MAKE ANY MODIFICATIONS TO YOUR MAINBOARD, YOU DO SO AT YOUR OWN RISK. EVEN TOUCHING SENSITIVE COMPONENTS SUCH AS CPU, RAM, ... CAN CAUSE THEM TO BE IRREVOCABLY DESTROYED (ELECTROSTATIC DISCHARGE - ESD).
!!! WARNING !!!
From: movshon@acf8.UUCP (Tony Movshon)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Upgrading an old IBM PC/XT to 640k
Date: 2 Mar 88 02:54:00 GMT
The following recipe for upgrading IBM PCs and XTs to 640k of memory on
the motherboard was posted in 1985 by Mike Brown of Nicolet. I did this on
my PC Portable (XT motherboard) and it worked like a charm. It seems like
it's time for a repost ...
Subject: Re: Upgrading an old IBM PC/XT to 640k
External links
- Vintage Computer Forum (VCF): Upgrading an IBM XT to 640k