- A Programming Language
One of the two available programming language for the IBM 5110. The
other one is BASIC.
- Beginners All purpose Symbolic Instruction Code
This is the other available language for the IBM computer. This BASIC
dialect has a very rich instruction set for file and data operations.
- Diagnostic Control Program
Builtin monitor program that is called with the key sequence CMD HOLD '-'
(keep CMD pressed).
An extended mode with diagnostic routines is called with CMD HOLD '-' '*'.
- Internal Machine Fix
- I/O Control Block
This block defines the device address, command etc. to be passed to
the I/O supervisor routine.
- Maintenance Analysis Procedures
- Maintenance Information Manual
- normally closed
Not to be confused with not connected!
- normally open
- Read Only Storage
The same as the expression ROM, not related to a specific access mode.
- Read/Write Storage
This would be called RAM today which is false. The expression Read/Write
Storage is more correct than Random Access Memory since a ROM can be randomly
accessed, too. RWS designates every form of read/write memories, e.g.
magnetic drum memories like the one in the IBM 650, too, which is not a
random access memory.