Introduction
2732 and 2716 EPROM chips are still in wide use, we can easily program them using this low-budget Willem programmer. Since
these chips require much larger current then the modern chips, we strongly recommend that you use an external AC/DC
adapter (the so-called wall wart AC/DC adapter). The adapter voltage output should be between 9v-12v with a minimun current
output of at least 250 mA. The onboard VDC plug is a standard 2.5mm diameter one, it does not matter whether the DC plug is
center positive or not. Pay attention to J10 near the DC plug, make sure the jumper is on the VDC side, so the programmer
can take power from the AC/DC power adapter. After you plug in your programmer, chances are that you will see all 3 LED's
on. Launch the software, make sure the printer port address of the software matches the address of the printer port of your
PC. Keep clicking the "Blank Check" button until the software takes control of the programmer (might take up to 2 min for Win
XP), now you should only see the green power LED on. You may insert your chip from now on.
How to program 2716 (this also works for 27C16)
We need to move some jumpers on the Willem programmer in order to program these old 2716 chips correctly, since the
default jumper settings are only good for the newer and bigger EPROM and flash chips. Pay attention to jumpers at J1, J2, J6
and J7: J1 is vertical now; J2 is also vertical; We have changed J6 and J7 to 25V Vpp setting. At this moment, you also want
to set the 12-dipswitch: 1,2,6,8,9, ON, rest OFF.
2732 and 2716 EPROM chips are still in wide use, we can easily program them using this low-budget Willem programmer. Since
these chips require much larger current then the modern chips, we strongly recommend that you use an external AC/DC
adapter (the so-called wall wart AC/DC adapter). The adapter voltage output should be between 9v-12v with a minimun current
output of at least 250 mA. The onboard VDC plug is a standard 2.5mm diameter one, it does not matter whether the DC plug is
center positive or not. Pay attention to J10 near the DC plug, make sure the jumper is on the VDC side, so the programmer
can take power from the AC/DC power adapter. After you plug in your programmer, chances are that you will see all 3 LED's
on. Launch the software, make sure the printer port address of the software matches the address of the printer port of your
PC. Keep clicking the "Blank Check" button until the software takes control of the programmer (might take up to 2 min for Win
XP), now you should only see the green power LED on. You may insert your chip from now on.
How to program 2716 (this also works for 27C16)
We need to move some jumpers on the Willem programmer in order to program these old 2716 chips correctly, since the
default jumper settings are only good for the newer and bigger EPROM and flash chips. Pay attention to jumpers at J1, J2, J6
and J7: J1 is vertical now; J2 is also vertical; We have changed J6 and J7 to 25V Vpp setting. At this moment, you also want
to set the 12-dipswitch: 1,2,6,8,9, ON, rest OFF.
Choose 2716(PCB3), increase tWP/tWC values by sliding relevant sliding bars to the right (default values are not good for the
2716 chip).
2716 chip).
Load the hex fiel you want to program, hit "Blank Check" button, make sure your 2716 is blank (if it;s not, use an external UV
eraser to blank it again), then hit "Program" button, you will see the following:
eraser to blank it again), then hit "Program" button, you will see the following:
The programmer will prompt you for a successful burn in a couple of minutes. Increase tWP/tWC to the maximum values and
try higher Vcc if you still encounter programming errors.
try higher Vcc if you still encounter programming errors.
