Hardware Interrupts; Dma Channels - Epson Equity IIe Product Information Manual

Hard Disk Drive Interface Board
I
Jumper
4 5
Built-in HDC is primary
A
B Built-in HDC is secondary
Enables built-in HDC
A
l
Disables built-in HDC
B
I/O Port Addresses
Interrupt Controller 1
Timer/Counter
Keyboard controller and Port B
CMOS RAM and Non-Maskable Interrupt Mask
Interrupt Controller 2
Numeric Coprocessor
Hard Disk Controller
Parallel Port 1
Serial Port 1
Parallel Port 0
Parallel Port 2 (on some video boards)
floppy Disk Controller
Serial Port 0
Equity Series Computers
I
Function
8/1/89

Hardware Interrupts

CTLR1 CTLR2
Keyboard
Interrupt from CTLR2
Serial port 2
Serial port 1
Parallel port 2
floppy disk interrupt
Parallel port 1
RTC interrupt
Software redirected to IRQ2
Resewed
Resewed
Mouse, pointing devioe
Hard disk controller

DMA Channels

I
Channel
Spare
floppy disk transfers
Spare (Hard disk drive)
Cascade of data from channel O-3
Spare
Spare
Memory Matrix
Total on-board
memory
256KB
5MB
EQUITY lIe
FUNCTION
Function
Socket 2 Socket 3
256KB
EQIIe-3