part-07. ARMCB + Procedures

[Hans Cadans]

Hi everyone,

I'm sorry, that I'm not on time with writing the new topic.
Alas I'm a week later than I hoped.

The last three weeks, when I was designing the I/O-hardware, I realised that the possibility of calling procedures
would be very easy. So the topic introduces you to calling subroutines. Also I implemented PUSH-/POP-instructions.
The PUSH-instruction, saves the value of a register in memory, for later use. POP-instruction gets this value back.

Last week when I finished these instructions, I realised that these instructions affect the flags.
They are not meant to do this. So I had to change them.

Now implementing the I/O- routines will be much easier.
This week I'm gonna start, making these routines


Best regards
Hans Cadans