c. I/O Buffer size
I/O Buffer Size
Parallel
RS232C
LocalTalk
Ethernet
∗
8MB
100KB
2K
4K
64KB
12MB
200KB
4K
4K
64KB
16MB
400KB
4K
4K
64KB
24MB
400KB
4K
4K
64KB
40MB
1MB
4K
4K
64KB
∗
The I/O buffer on the DPI Ethernet board
Regarding the frame buffer size, it is dynamic: for full frame, it
depends on the paper size, resolution, and number of color images
(1, 3, or 4); for PowerBanding, the allocation of the compressed
frame memory will vary depending on what feature are enabled on
the printer. For example, if there are no option cards, the PowerBand
area will be large, since it will include the buffer area normaly allo-
cated to the disk or AppleTalk code.
d. Parallel I/F protocol
This model supports the protocol of the compatible and the nibble
mode.
Protocol between the host computer and the printer
(Negotiation mode)
Data1~8
HOST
PRINTER
0~35ms
min0.5µs
0~1s
/INTR
Low
/FAULT
High
Clr
PE
High
Interrupt
SELECT
High
/ACK
Low
min0.5µs
High
/SELECTIN
Low
/AUTOFD
/STB
Low
/STB
High
AUTOFD
HIgh
/ACK
HIgh
DELAY
On
PE
Low
/FAULT
Low
SELECT
High,Low
0~35ms
Extensibility request value
The extensibility request value is read.
ECP, Nibble, Reject ON
/Fault is set by software.
This is returned only by the device
conforming to 1284 standards.
/Fault is set by software.
If there are any send data, /Fault is
LOW. If not, it is LOW.
In ECP, SELECT is HIGH. In Nibble
mode, SELECT is LOW. In Reject
mode, SELECT is LOW.
With 500ns delay timer ON
SHARP SERVICE MANUAL JX8200SM [13] ELECTRICAL SECTION
13 – 24
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