Sharp MZ-3500 Bedienungsanleitung PDF herunterladen (Seite 10)

ROM-IPL

1. An 8KB ROM (2764 or mask ROM equivalent) is used

for the ROM-IPL.

2. When the system reset signal turns from low to high

state after power on, the main CPU starts to operate At

this stage, the ROM-IPL is addressed.

3. The CPU starts from address OOOOIROM address 10000)

4. The main CPU sets the sub-CPU reset signal from low to

high state as it goes out of its initial state via the memory

mapper and the sub-CPU starts to operate. At this point,

the ROM-IPL is addressed by the sub-CPU.

5. Address 0000 of the sub-CPU is ROM address (0000)

The memory area above ROM address (1000) cannot

be used by the sub-CPU because the mam CPU initial

program has been loaded there.

2-2. SDÌ (SYSTEM LOADING & CP/M)

SDÌ determines which operating system is in use. The

system is loaded in the CP/M (Control Program for Micro

processors) mode.

MZS.'tOO

Mam CPU logical address (during IPL operation)

Logical address of the sub-CPU

ROM physical address

МЫ = 0( L)

WS0=l(Hj

FFFF

P800

F7FF

i. Л 0 n

' \

\ \

V \

\ \

-----

RAM

5FFF

5800

57FF

5000

4FFF

4800

47FF

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 115 116

Keine Kommentare

Sharp MZ-3500 Bedienungsanleitung Seite 10