C. Glossary
60
TERMINOLOGY
backplane
Refers to the STD bus.
BHE*
A former STD-80 signal called MEMEX. See
MEMEX.
BIOS
Basic Input Output System. This code typically provides low level basic I/O
services.
CNTRL*
Control. An auxiliary timing signal or an interrupt signal on the STD bus.
CPU
Central Processing Unit.
DMA
Direct Memory Access. Can access memory directly without CPU
requirements. Use for faster data transfer rate when processing of I/O
data on a byte-by-byte basis is not required.
FIFO
First In First Out. Register cue that sequences accesses in the same order
as programmed.
frontplane
User accessible symbols not routed through the STD bus. Also refers to
the front of a card where the I/O connectors reside. The connectors are
typically latching and may be used for chaining interrupts from one card to
another.
IDE
Integrated Drive Electronics (IDE) refers to a disk drive that has the control
logic embedded on the drive itself. There are many types of IDE drives.
The generally accepted reference is to a PC-AT compatible controller that
is embedded. The ZT 8952 uses a PC-AT IDE type disk drive.
INTRQ*
Interrupt request. Processor card input signals that conditionally interrupt
the program when enabled by a specific program instruction.
IRQx
Slot-specific interrupt request used within STD 32 systems.
IXL
Slot-specific interrupt support, low-level asserted.
IXP
Slot-specific interrupt support, positive edge-triggered.
Mbps
Megabits per second. Used to define floppy disk serial transfer rates
between the drive and the controller.
MEMEX
Memory Expansion. Output to STD bus used to expand memory access
capability.
RAM
Random Access Memory.
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