You'll need a free slot and an available system interrupt for the controller card . ( An interrupt is how a device in a computer talks to the main chip .)
12.
These cartridges map into $ F000 rather than $ 8000 and displace the kernel ROM . If MAX Mode is used, the programmer will have to provide his own code for handling system interrupts.
13.
The company points out that users can now connect their external modem to one of the card's serial ports, and use the additional port to run their PalmPC or digital camera without using an additional system interrupt.
14.
In fact, if you've used up all your system interrupts ( the things that tell the main chip something is happening with a peripheral, like data is being received ), disabling COM2 is a good way to free one.
15.
Due to keyboard scan being controlled by the system interrupts, it is one of the troubleshooting hints when MSX machine does not display any image ( given correct power is tested to be present ) to press CAPS key and see if respective LED toggles.
16.
Early microcomputer systems such as the Commodore 64 and many game consoles ( which use televisions as a display device ) commonly synchronize the system interrupt timer with the vertical frequency of the local television standard, either 59.94 Hz with NTSC systems, or 50.0 Hz with most PAL systems.
17.
These S / 360-67 features plus reference and change bits as part of the storage key enabled operating systems to implement demand paging : referencing a page that was not in memory caused a page fault, which in turn could be intercepted and processed by an operating system interrupt handler.
