Oki ML420 - Setting the Top of Form Position; Understanding TOF and Forms Tear-Off Interaction

42113901TH01 Rev.3 12 /
Oki Data CONFIDENTIAL
A0~A8
CAS-N
RAS-N
UCAS-N
LCAS-N
WR-N
RD-N
WRH-N
WRL-N
RAMMPU
P03
CS1
WRL
P11
RD OE
D0~D15
RAS
UCAS
LCAS
WE
T1 T2 T3Clockout*
A0~A8
RAS-N
VCAS-N
LCAS-N
RD-N
D0~D15
(Read)
WR-N
D0~D7
(Write)
16-bit bus, Word instruction
ALS139
ALS11
T4
* Clockout is provided when the original excitation is selected.
(3) RAM
The RAM is CMOS dynamic RAM with 256K × 16-bit (4Mbit), and used as buffers (such
as receiving buffer, printing buffer, DLL buffer and working buffer).
The following shows the examples of the memory access operation.