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Description
Memory
The on-board memory occupies a contiguous 32-Kbyte address space, the
base being at C8000h or D0000h (jumper selectable). All memory is 8-
bit only. The following table shows the memory map:
Offset
Device
0000
BIOS page, SRAM
and DOS FLASH
disabled
BIOS page, SRAM
and DOS FLASH
enabled
4000
DOS Flash page
6000
SRAM
The BIOS is a 12V non-sectored Flash device. Since it is not critical to
the system boot process, no jumper mechanism is present to enable an
alternative 'boot' block.
The Flash disk is a 2-Mbyte 12V part. Since the part requires a tight-
toleranced 12V rail, a DC/DC converter generates the programming
voltage. The part is protected from programming via an Apricot port.
The 32-Kbyte SRAM is for use by the BIOS as a stack or for other
storage purposes.
On card reset, the SRAM and DOS Flash are disabled, being enabled by
the BIOS through the Apricot Control Register.
T e c h n i c a l I n f o r m a t i o n
Page Size
Total Size
32 Kbytes
128 Kbytes
16 Kbytes
8 Kbytes
2 Mbytes
8 KBytes
8 KBytes
OWNER'S HANDBOOK 5-41
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