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09FFFF
640KB
standard RAM on main board
System Memory
,
OFd~o~
!
64~B:
, !
: '
:
i: 64KB:BioS_Ro'M_on,main board
- -; ' . !, -
1' - -" : ' , - -
B/~S'"B;o-~(-
~,Duplicated'~c~de
assignment at
OFFFFF-
.~.
address
FFOOOO
100000
_T~ II~-
--
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,
lFO.oOO
200000
I
I
FD5FFF '
FEOOOO
I
FEFFFF
·lMB
R~M
,
14MB'
R~~
61KB '
~~~
'I~'
E~'pansion.
RAM on main board
(op~ion)
Optio'nal RAM area ion I/O slot
Reservd for-RAM on I/O slot
2-1-3. 1/0
Mapi'
,',.,
'! :; ..• ; , '
!
IJ~',"
The
CPU :cohtlr6l~ithe--;-iIO.(ad&ess, spCJ,pejh~~:gh"wi1ic~: t~e C!?V! - ;
1
-<*>
~Dn,ly,\one i,Vi-MMI ~all be enabled bYIH/W sWitch selectIOn,
accesses
IId~ort~:bf ~ict~rhJI d~vl¢~s.JB~-~e!arei64K"(;i'scre~e 8~b:it
:
ports in this
i/o;
cidtlresel"area, and any adjaCent! two . . . p-otts-can
be :
-,:
,:;e,XG:e'pi-.op~O~:::b~a~d+·.~~
.'
~'-:~-l
used as a,
1e-~il P~rt.
Table
2-2
shows.
the-.I/O
map-:"
' .
: '
-~r1~bl~
'2T?
;/O:~~~
110
Address
0000
0001
0002
0003:
0004
0005
0006 '
0007
0008
0009
OOOA
OOOB,
OOOC
0000
OOOE:
OOOF,
0020
0021
!
I:
.
,I
__ ._ .•
Write
: CHO
base, curren~ address
: CHd
base, curren(W:ord:
count~
; CHI
base,Olcu-rrenf: .;ddress
I
'~Hl
base,
9urre~tl
word count
:
t~2
base,
¢~t,r~mj
address
!
Ctb
base, turrrent word count
i '
I
1.. ___ -'
____ .
_
, . QH3...bas.e .. current.addiess_
--
cH"f base
,currenf-warp 'count
, ,
Command register
'
~ ~,
Request register
: Single mask register
Mode register
,
:
!
Clear byte painter
flipLflo~
Master clear
"
Clear mask register
All mask register bit,
ICW1,GGW2,GCW3
JCW2, ICW3, ICW4, OCWI
l.~",C":'
i,
'(j
I
, -
I'il
--'1
' ••
Cl;lo'
,9Ll(~ent la~dress!
" /,CAO' ~~i~ent !~orcrt:6Lnt
,
:_~~t'Hl qJr~enf
aQdress
',.'
,---
"CH'~ ~~rr,eAf:$-9Jd CO~IJ't
:
'
1
_c~: c~rr:ent !a~dress
I
CH2 cyr~ent ,~ord count:
, J
~
" _
CH3.
.current ~addres.s_
'
CH3'c~r~enl
i\fora-cou-rii' -
Status
i
!
X ...
~.
·X-~~
~,
.. ··,,,,'X·
"
,
X;
i
,~'
i
T'~mporary
)I'
·x
-- -
IRR"ISR-/IAter~upt
·Ievel
IMR
OMAC #1
,"
---,
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