Epson Equity 386/33 PLUS Product Support Bulletin page 3

6. Changing Hardware jumpers for Monochrome Video Support.
A.) Power down the system and change the hardware jumpers for
monochrome support.
J1 Onboard VGA video port:
(3" from rear of main pcb on RtSide)
A setting Video port enabled
B setting Video port disabled
B.) Configure the video adapter card appropriately for the monitor, in particular
the Horizontal frequency output from the video card being used. In our
test, the default Horizontal output frequency from the MDA card had to be
changed from 31.5KHz to 18.44KHz. When the adapter was installed
using the factory defaults, 31.5Khz, upon powering-up the system item 'b'
under display symptoms mentioned above was encountered.
C.) Install the video adapter in an available expansion slot. Attach the
monochrome monitor to the MDA's video port.
D.) Power up the system and then the monochrome display. The system will
reboot and load to DOS. Epson MS-DOS, Microsoft Windows 3.1 and
Lotus 3.1 were tested without any operation or video errors.
7. General Installation Tip:
During the test, a configuration error was noted when the Color/Monochrome
jumper, (J4), was not moved to the Monochrome setting. Upon boot, the
monitor displayed four legible 'DOS' prompts in 4 equally spaced quadrants of
the screen. Setting the J4 jumper to the Monochrome setting corrected the
problem and the system functioned under general testing criteria (i.e. DOS,
Windows applications, Lotus etc.)
The setting of the system jumpers is of critical importance for a successful
Monochrome video sub-system installation.
8. Third-Party Products Tested/Used:
Mfg: Hitec Associates Ltd.
EIZO PROFESSIONAL Enhanced MDA (Monochrome Display
Product:
Adapter)
Model: MD-B05
Name: Hitec Associates Ltd.
Address: 601, 87BLDG., 7-50
Yokogawa, Kanazawa, 921, Japan
Phone: 0762-41-8600
PSB No: S-0162
Page: 3 of 3
J4 Color/Monochrome Monitor Used:
(4.5" from rear of Main PCB on RtSide)
(1" from the DC power connector)
A setting Color monitor attached
B setting Monochrome Monitor attached