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Molly programming
Although the Molecular was programmed in machine code. Many
tasks were provided by the OS as Subroutines. More
information about the LOS operating system.
An Indirect Jump to Subroutine would be made to an
address in zero page. The words after the called depended on
the subroutine, but would generally supply pointers to the values held in
the user's partition.
For instance :-
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| JSBR
IZ 1747 |
Compute |
Not
a very quick routine! In fact you could almost be shot for
using it!
The routine could accept either single or double word values
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| Pointer
to Multiplicand |
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| Pointer
to Multiplier |
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| Pointer
to divisor |
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| Pointer
to result |
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| JSBR
IZ 1711 |
Add |
Very
quick routine, which could accept single, double, or triple word
lengths |
| Pointer
to first value |
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| Pointer
to second value |
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| Pointer
to result |
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| Word
Length |
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| JSBR
IZ 1670 |
Fetch
File |
Used
to fetch a single record from a disk file. The control word
specified the file number on disk, and an option to lock all file
transfer until the tasks next IO event. |
| Control
Word |
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| Address
of record ID |
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| Address
of extract area |
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| JSBR
IZ 1652 |
Put
characters |
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| Pointer
to NUL terminated string |
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Sends
a stream of characters to the user's terminal.
Not used for printers - for which an entire line was built in core
and sent as one to the printer. |
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