Oki OKIPAGE 8c Plus Maintenance Manual page 15

• ECP mode
This mode provides the asynchronous bidirectional interface and transmits and
receives 1-byte data using eight data signal leads under semi-duplex control by the
host.
When the power is turned on, the compatibility mode is automatically selected. The
change to another mode from the compatibility mode is made through negotiation.
(When the BI DIRECTION is set to ENABLE in the menu, this change can be performed.)
(For the electrical/physical characteristics of this interface, see APPENDIX B)
(b) HSP interface (Option)
This interface (slot) is an OKI unique universal interface that provides the platform to
connect various of boards (including those supplied by third venders) such as the LAN
connection expansion board and SCSI expansion board.
Any expansion boards compatible with this interface can be mounted on the Control
board in the piggyback board from without modifying the program at the printer side. The
conceptual diagram of the HSP interface is shown in Fig. 2-3.
Printer
(For the electrical/physical characteristics of the HSP interface, see the HSP interface
technical manual.)
(9) 2nd Cache and 2nd Cache Controller
This printer has 2nd Cache unit which type is Write Through Cache and size is 512 KByte.
There are any difference between the instruction and data.
All of the CPU read/ write accesses are cached to same 2nd Cache memory.
(10) RAM module
• Pin layout
• Basic specificaton
- Type:
- Access time:
- Capacity:
- Parity:
41057601TH Rev.1
Control board
HSP
interface
1 36
72 pins SIMM (32 bits buss width)
60ns, 70ns, 80ns
4, 8, 16 or 32MB
None
LAN
expansion board
Figure 2.3
37 72
Network, etc.
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