Specifications

Chapter 2: Getting Started
2 – 10
B. Powering Up the ZVG
Step 1: Verifying ZVG Operations
Start with the monitor and the ZVG powered down, and the parallel port cable dis-
connected from the ZVG.
To verify the ZVG is operating properly we will run the program ZVGTWEAK.
ZVGTWEAK requires that the ZVG is run in the IEEE compatibility mode. This
requires J3 jumper 1284 be installed.
Note: Whenever J3-1284 is changed, power to the ZVG must be cycled.
After setting J3-1284, power on the ZVG, status light D4 will blink one time. If it
blinks more than one time, or not at all, see the Chapter on Troubleshooting.
Step 2: Setting The 'ZVGPORT=' Environment Variable
Setup the ZVGPORT environment variable by typing the following from the DOS
prompt:
set ZVGPORT=Pxxx Dx[,x] Ix Mx
The ZVG device drivers obtain their parallel port information from the environment
variable 'ZVGPORT='. This variable indicates the address of the ECP connected to
the ZVG, it indicates the DMA channel and the IRQ level used, and it indicates the
type of monitor connected to the ZVG.
Pxxx = The address of the ECP port in hex.
Dx[,t] = The DMA channel the ECP port is set to, and the type of DMA to
use (the ',t' is optional and defaults to '1' if not given).
Ix = The level of interrupt used by the ECP port.
Mx = The type of monitor connected to the ZVG.
Pxxx
The port address of the ECP is given by the 'Pxxx' parameter. 'xxx' is the address
used by the ECP port in hexidecimal. The best way to determine the address is to
go into your PC's BIOS setup menu (Many PC's require you to hold down the DEL
key while booting to get to this screen, though your PC may differ.) Once in the
BIOS setup menu verify that your parallel port is set to the ECP mode. Write down
the address, DMA and IRQ settings. Use these setting to setup the 'ZVGPORT='
parameters.