DIGITAL-LOGIC Microspace MSM586SEN - Memory; System Memory Map; System I;O Map

DIGITAL-LOGIC AG MSM586SEN/SEV Manual V1.5E
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5.7 Memory
5.7.1 System Memory Map
The ELAN520 CPU used as central processing unit on the MICROSPACE has a memory address space
which is defined by 32 address bits. Therefore, it can address 1 GByte of memory. The memory address
MAP is as follows:
CPU
Address: Size: Function / Comments:
000000 - 09FFFFh 640 KBytes
Onboard DRAM for DOS applications
0A0000 - 0BFFFFh 128 KBytes
CGA, EGA, LCD Video RAM 128kB
0C0000 - 0CBFFFh
0CC000 - 0CFFFFh
48 KBytes
16 KBytes
VGA BIOS selected by the hardware
BIOS extensions selected by the hardware
0D0000 - 0D4000h
0D4000 - 0D8000h
0D8000 - 0DFFFFh
16 KBytes
16 KBytes
32 KBytes
free for user
free for user
free for user
0E0000 - 0EFFFFh 64 KBytes
BIOS
0F0000 - 0FFFFFh 64 KBytes
BIOS
100000 - 1FFFFFh 1 MByte
DRAM for extended onboard memory
200000 - FFFFFFh 14 MBytes
DRAM for extended onboard memory
See also BIOS manual for additional details
5.7.2 System I/O map
The following table shows the detailed listing of the I/O port assignments used in the MICROSPACE board:
I/O Ad-
dress
Read/Write
Status
Description
0000h R / W DMA channel 0 address byte 0 (low), then byte 1
0001h R / W DMA channel 0 word count byte 0 (low), then byte 1
0002h R / W DMA channel 1 address byte 0 (low), then byte 1
0003h R / W DMA channel 1 word count byte 0 (low), then byte 1
0004h R / W DMA channel 2 address byte 0 (low), then byte 1
0005h R / W DMA channel 2 word count byte 0 (low), then byte 1
0006h R / W DMA channel 3 address byte 0 (low), then byte 1
0007h R / W DMA channel 3 word count byte 0 (low), then byte 1
0008h R DMA channel 0-3 status register
bit 7 = 1 Channel 3 request
bit 6 = 1 Channel 2 request
bit 5 = 1 Channel 1 request
bit 4 = 1 Channel 0 request
bit 3 = 1 Terminal count on channel 3
bit 2 = 1 Terminal count on channel 2
bit 1 = 1 Terminal count on channel 1
bit 0 = 1 Terminal count on channel 0
Continued...