Sharp PC-7200 Service Manual page 17

-~-. -Byte-Bos-flyeIe
- -
CPU
Even Memory Read
Odd Memory Read
Even Memory Write
Odd Memory Write
Even I/O Read
Odd I/O Read
Even I/O Write
Odd I/O Write
Even Memory Read
Odd Memory Read
Even Memory Write
Odd Memory Write
DMA Even Memory Read (lOW)
Odd Memory Read (lOW)
Even Memory Write (JOR)
Odd Memory Write (lOR)
Even Memory Read (lOW)
Odd Memory Read (lOW)
Even Memory Write (JOR)
Odd Memory Write (lOR)
MASTER Even Memory Read
Odd Memory Read
Even Memory Write
Odd Memory Write
Even I/O Read
Odd
VO
Read
Even I/O Write
Even I/O Write
Table 2~5. Bus buffer control
-i."W&I,-E- -HIGH&I,-E-
-6WA~".f
H H
H
H H H
L
H H
H L H
H H H
H H H
L H H
H
L
H
L H H
H L L
L
H H
H L L
H H H
H
H H
H H H
H H H
L H
H
H L
L
L H H
H L L
L
H
H
H L
H
L H H
H L
H
L H
H
H L H
L
H
H
H
L H
2 -11
--IlIR.1-1i--
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
H
H
L
L
H
H
L
L
Remar-k-s----
Memory on the main PWB
-
P C-7200
B - bit j/O
on
the main
PWB
B bit
memory on
the option
slot
I/O to/from memory on the
main PWB
I/O to/from 8-bit memory
on the option slot
Memory on the main PWB
B - bit I/O on the main PWB