Sharp JX-8200 Service Manual page 183

SHARP SERVICE MANUAL JX8200SM [13] ELECTRICAL SECTION
c. I/O Buffer size
I/O Buffer Size
Parallel RS232C
8MB 100KB
12MB 200KB
16MB 400KB
24MB 400KB
40MB 1MB
∗ 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)
HOST
Data1~8
Extensibility request value
/SELECTIN High
/AUTOFD Low
/STB Low
/STB High
AUTOFD HIgh
Ethernet ∗
LocalTalk
2K 4K 64KB
4K 4K 64KB
4K 4K 64KB
4K 4K 64KB
4K 4K 64KB
PRINTER
/INTR
Interrupt
PE
/FAULT
/ACK
SELECT
PE
/FAULT
SELECT
DELAY
/ACK
The extensibility request value is read.
Low
ECP, Nibble, Reject ON
Clr
/Fault is set by software.
High
This is returned only by the device
High
conforming to 1284 standards.
Low
High
/Fault is set by software.
Low
Low If there are any send data, /Fault is
LOW. If not, it is LOW.
High,Low
In ECP, SELECT is HIGH. In Nibble
mode, SELECT is LOW. In Reject
On
mode, SELECT is LOW.
With 500ns delay timer ON
HIgh
13 – 24
0~35ms
0~1s
min0.5µs
0~35ms
min0.5µs