hello,

has anyone implemented multitasking yet? how? i'm in FRM, so i can't use TSS. and now i'm searching an other method. my idea is, to set up a table in the memory, where the ss and sp and some other thing is saved, and then set up the int 0x08 software (0x00 hardware) to save the current values to the stack, go to the next entry, load ss and sp and then return to the programm. i've implemented it yet, but it only runs, if there's only the kernel-task. whenever i start a new task, it crashs. i think it's because the stack hasn't the return-adress. when the kernel-task stops, the interrupts goes to the next entry, but on the stack are no values, and so it jumps by iret into 0x0000:0x0000. and now i'd like to ask somethings:
1.: if the interrupt starts, it saves first the flags, then the segment and then the offset, right?
2.: how did you do this? have you an other idea?

mfg

JN!

Take a look at the 512b compo winner, full multitasking in 512 bytes, may help ?.
http://512.decard.net/entries/
Its called "nanoos2.zip".

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ASHLEY4.

Batteries not included, Some assembly required.

is it also in FRM?

Realmode i think.

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ASHLEY4.

Batteries not included, Some assembly required.

ok... i'll have a big look at it. but till now i didn't find the special code-part. who is the coder?

KVP, he's usually on here: http://groups-beta.google.com/group/alt.os.development

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(@@)
ASHLEY4.

Batteries not included, Some assembly required.