Specifications

Table 5-1. Little Board/PC Memory Map
MEMORY ADDR FUNCTION
F8000 - FFFFFh BIOS PROM Socket at U21 (Required). Generally
occupied
by a PC c~tible ROM-BIOS with _ro
SCSI/BIOS extensions. Contains a startup vector
at address FFFFOh.
FOOOO - F7FFFh
Read/write byte-wide memory socket at U15.
EOOOO - EFFFFh
Read/write byte-wide memory socket at U26.
Jumpers allow the origin of the device to be
at EOOOOh, EBOOOh, ECOOOh, or EEOOOh.
COOOO - DFFFFh
Not used on the Little Board/PC.
AOOOO - BFFFFh
Normally reserved for video RAM, as follows:
CGA Video:
88000 - BFFFFh
Monochrome: 80000 - B7FFFh
EGA Video: AOOOO - AFFFFh
Jumpers allow the use of SIMM3 onboard DRAM
memory within this restricted video area.
BOOOO - 9FFFFh General purpose memory. Can be accessed via
onboard
DRAM socket "SIMM3,1 or via the board's
PC Expansion Bus (determined by jumpers).
40000 - 7FFFFh Genera l purpose memory.
Can be accessed via
onboard
DRAM socket ISIMM2," or via the board's
PC Expansion Bus (determined by jumpers).
00000 - 3FFFFh
General purpose memory. Can be accessed via
onboard
DRAM socket "SIMM1," or via the board's
PC Expansion Bus (determined by jumpers).
5-2