Sharp MZ-5500 - Page 47

_______
To HOLl)
c..onversion
(..iru,.l,t
HRQ
HLDA
AO-7
DMAE
A8-15
A16-19
DO-15
16-8
Cvmmand
CLK
R IlY
HRQ
DREQO
DREQO
)
HL[}\
DACRO
DACKO
Ta 1/0 siot
DREQS
DREQ3
AO
DREQ3
I
DACK3
A7
ADSTB
DREQI
DREQ
DBO
DACKI
DACK
DB7
DACK2 f.f
IOR
CTC-I
JOW
DACK2
MEMR READY
MEMW C K
DACK2
(DRAM
refre5h cir(.ld)
>---+--40 Q
---"'--1/
--.J
Fig.6-1 D~~ circuit . block diagram