System Memory Map; System I/O Address Map - Epson ActionTower 3000 Computer User Manual

System Memory Map

Memory address range
000000h to 09FFFFh
0A0000h to 0BFFFFh
0C0000h to 0C7FFFh
0C8000h to 0DFFFFh
O0E0000h to 0FFFFh
100000h to FDFFFFh
FE0000h to FFFFFFh

System I/O Address Map

Hex address
000 - 01F
020 - 03F
022 - 024
034, 038B, 03V
040 - 05F
060 - 06F
070 - 07F
080 - 09F
0A0 - 0BF
0C0 - 0DF
0F0
0F1
0F8 - 0FF
1F0 - 1F8
200 - 207
278 - 27F
280 - 2DF
Specifications
A-14
Usage
640KB base memory
128KB video memory
32KB video ROM BIOS
32KB
external adapter ROM BIOS
128KB system ROM BIOS
Extended memory
128KB
of ROM remapped from 0E0000h to
0FFFFFh
Assigned device
DMA controller 1,8237
Interrupt controller 1,8259
Chip set configuration registers
AD12 chipset configuration registers
Timer, 8254
Keyboard controller, 8042
NMI (non-maskable interrupt)
DMA page register, 74LS612
Interrupt controller 2,8259A
DMA controller 2,8237
Clear math coprocessor
Reset math coprocessor
Math coprocessor
Hard disk
Game I/O
Parallel printer port 2
Alternate enhanced graphics adapter