Oki OL1200 Service Manual page 21

transferred in the form of two nibbles using ERROR, BUSY, FAULT, and SELECT signal leads. This
mode can provide the bidirectional operation in combination with the compatibility mode.
- ECP mode
his mode provides the asynchronous bidirectional interface and transmits and receives 1-byte data
using eight data signal leads under the 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) RS232C serial interface
The following protocol is supported for the serial interface conforming to EIA RS232C.
- READY/BUSY (DTR HI or DTR LO)
- X-ON/X-OFF
- RBST X-ON
(For the electrical/physical characteristics of the interface, see APPENDIX A)
(c) OKI HSP interface (Option)
This interface (slot) is an OKI unique universal interface that provides the platform to connect various
boards (including those supplied by third venders) such as the LAN connection expansion board.
Any expansion boards compatible with this interface can be mounted on the Control board without
modifying the program at the printer side. The conceptual diagram of the OKI HSP interface is shown in
Fig. 2-2.
(For the electrical/physical characteristics of the OKI HSP interface, see the OKI HSP interface technical
manual. This manual will not be available to the general public.)
(8) RAM module
- Pin layout
- Basic specification
- Type: 72 pins SIIM (32 bits buss width)
- Access time: 60ns, 70ns, 80ns, 100ns
- Capacity: 1, 2, 4, 8, or 16MB (16 MB RAM will not be sold by Okidata)
- Parity: None