GE V7769-SDK-XP combustion engine card
Like a desktop system, the V7768/V7769 include special input/output instructionsthat access I/O peripherals residing in I/O addressing space (separate and distinctfrom memory addressing space). Locations in I/O address space are referred to asports. When the CPU decodes and executes an I/O instruction, it produces a 16-bitI/O address on lines A00 to A15 and identifies the I/O cycle with the M/I/O controlline. Thus, the CPU includes an independent 64 KByte I/O address space, which isaccessible as bytes, words or longwords.
Standard hardware circuitry reserves only 1,024 byte of I/O addressing spacefrom I/O $000 to $3FF for peripherals. All standard PC I/O peripherals, such asserial and parallel ports, hard and floppy drive controllers, video system, real-time clock, system timers and interrupt controllers are addressed in this region ofI/O space. The BIOS initializes and configures all these registers properly;adjusting these I/O ports directly is not normally necessary.
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TRICONEX 4351B
BENTLY 3500/40M
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