Using the IBM System 36/38 Emulation Adapter Card As a Time Source
Original Publication Date: 1988-Dec-01
Included in the Prior Art Database: 2005-Feb-15
A card for emulating the IBM 5250 has a single-board computer that has link interfacing hardware to a 5250 protocol twinax and shared memory with the IBM Personal System/2*. A private communications protocol utilizing an interrupt line and shared memory with the Personal System/2 gives this environment an extremely easy way to define events or transactions between the two processors. A new function this adapter card provides is a guaranteed attempt to interrupt PC execution on an extremely regular interval. This is possible because the adapter card has its own timer hardware and the processor on this card, which is ultimately responsible for causing the hardware interrupt to the Personal System/2, can establish event types to the Personal System/2 via a private protocol in shared memory.