Epson ActionLaser 1300, Руководство по обслуживанию

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/Action Laser 1300 Service Manual
Operating Principles
2.2.1.3 Interrupt Control
determines the priority level of the interrupt and outputs it to terminals through
An interrupt is then sent to the CPU. If the CPU accepts the interrupt, terminals through
all go HIGH to indicate the interrupt acceptance to confirms that
terminals through are HIGH (interrupt acknowledge), then sets the VPA terminal to LOW
and informs the CPU that this is an automatic vector interrupt. This initializes the interrupt
process.
has a controller for the automatic vector interrupt.
2.2.1.4
DRAM Management
The video controller circuit uses DRAMs for the system RAM and for the V-RAM.
The DRAMs (including optional are managed by and
handles the main management. The outputs WE, and OE signals. The DRAMs
(including optional are controlled by the CAS, WE, and OE signals from the and
are also controlled by the signal from the
REFRSH
RASEN
O E
A d d r e s s W E
D a t a
“
SIMM
IC23
1
Figure 2-35. DRAM Management
Rev.
2-23