Access to Interrupts

[Onkar Shinde]

the simulator already provides access to memory, I/O ports and the stack, however for programming with interrupts, it would also be useful to be able to easily access interrupts - so that interrupts can be easily triggered manually, or possibly be configured to occur regularly, using a configurable timeout/delay.

This would help emulating a basic timer for example, where we can configure gnusim8085 to trigger a certain interrupt every couple of milliseconds (or at a rate of x hz/khz), which in turn could be used by a corresponding interrupt handler to implement a timing routine.

Having an option to dynamically trigger/modify interrupts at runtime would also be very useful, too!

[Bug Importer (bug-importer)]

also, we have to keep in mind that there's a distinction between software/hardware interrupts and interrupt priority.

[Bug Importer (bug-importer)]

And these may be helpful during implementation:
http://yesnarayanan.googlepages.com/interrupts.ppt
http://www.ee.hacettepe.edu.tr/~kenan/ele415/interrupt.ppt

[Bug Importer (bug-importer)]

you cannot really do much interrupt programming without the ORG directive being supported in the first place

[Bug Importer (bug-importer)]

Implementing support for the ORG directive is already considered with pretty high priority (7/10), see: http://sourceforge.net/tracker/?func=detail&aid=1799444&group_id=86462&atid=579702

[The Escapist (wisd00m)]

having this would be very useful for prototyping purposes.
I would in fact suggest supporting optional interrupt routines that can handle I/O, for example triggering a custom GNUSim8085 interrupt could be used for writing strings to the log window or doing other simple output tasks. This could be tremendously useful for troubleshooting purposes. Similarly, having a way to ask the user for input data just by triggering an IRQ would be powerful. For example, this would make it to execute an interrupt for getting or showing data from the user.

This could be a good workaround to emulate features that are currently provided by an EEPROM or BIOS

[The Escapist (wisd00m)]

Here are some good links regarding 8085 interrupts:

http://www.8085projects.info/Interrupt-Structure.html
http://www.8085projects.info/Hardware-Interrupts.html
http://www.8085projects.info/SIM-and-RIM-for-Interrupts.html