Fingers Crossed for 2021 ...

2020 was the worst! COVID kept the museum closed for much of the year and a mains water pipe bursting causing a flood kept us closed for the rest. 
We're hoping to re-open in the next few months ... fingers crossed! Read More >>>

Please Donate Via Just GivingNo visitors, no workshops, no events, no school visits... no income. We know that things are tough for everyone right now, but if you can afford to help us through these tough times please donate what you can.

There's over 36,000 exhibits here! That should keep you occupied for a bit - get searching!

Or come and get involved on our social media channels ...

      Twitch  Facebook          Online Gift Shop      

Thank you.

IBM - IBM System/370 - Principles of Operation

System/370 was a range of IBM mainframe computers.  It was first announced in 1970 and the final associated machine was released in 1988.  

This item is the overall manual to System/370, but it is by no means a complete guide.  Different features of the system will have their own extensive documentation.

From the preface:

'This publication provides, for reference purposes, a detailed definition of the machine functions performed by System/370.

The publication describes each function at the level of detail needed to prepare an assembler-language program that relies on that function. It does not, however, describe the notation and conventions that must be employed in preparing such a program, for which the user must instead refer to the appropriate assembler-language publication.'

560 pages.

Reference Number : GA22-7000-10

Date Published : September 1987

Manufacturer : IBM

Format : PDF






This exhibit has a reference ID of CH8505. Please quote this reference ID in any communication with the Centre for Computing History.

IBM - IBM System/370 - Principles of Operation

Click on the Images For Detail

This manual can be downloaded from the Computing History Shop.

  • File Size: 46.53 MB
  • Price: £4

Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum