Erasing Eproms, Can you cook them?

[amsterdamny]

You can change the led but i guess from what i read you cant get enough power from the usb, so if i cut the power leaving the computer via the usb and do not connect going back to the computer, and connect direct to the power supply, I should get more amps, and if i connect pin 32 on the ziff to pin 28 should get me more current, yes, no, maybe?

 

[RetroHacker]

You can change the led but i guess from what i read you cant get enough power from the usb, so if i cut the power leaving the computer via the usb and do not connect going back to the computer, and connect direct to the power supply, I should get more amps,

From what I understand, the Willem programmers use the USB connection for power ONLY. All data is transferred through the parallel cable. IMHO, using USB as a power source is a dumb move, they should have just gone with an AC adapter or something, but they didn't ask me. You can only draw 100ma from the USB port (as per the spec), unless you negotiate with the bus, and request high power (500ma) mode. Look at the Willem board and see if any of the chips near the USB port are USB controllers - you need a special chip/microcontroller to talk to the USB bus at all.

So, if you are planning to go cutting and patching, I'd cut the USB cable, and connect the power/ground wires to a standard PC molex, and just plug the stupid thing into the power supply of the computer. Just don't hook the data lines up to anything at all. 5v is 5v, and this way, the Willem should be able to draw more current. Blowing something up would be rather unlikely.

and if i connect pin 32 on the ziff to pin 28 should get me more current, yes, no, maybe?

No, since pin 32 shouldn't even be powered at all in 2716 mode. If you tried that, you're likely to fry something.

-Ian

 

[amsterdamny]

I read that jumper thing from there forum http://www.mcumall.com/forum/topic.asp?TOPIC_ID=52

 

[amsterdamny]

I think it should be 32vcc ziff to pin 24 vcc on a 2716

 

[RetroHacker]

Ah. Well, they definitely know more about that thing than I do. Seems like a bad design though, if you ask me I've never messed with an actual Willem programmer, and now I'm glad. Man, even my little homemade kludge of a programmer from years ago worked better than this thing...

-Ian

 

[amsterdamny]

Yea, this thing is a real piece of crap, NEVER BUY WILLEM

 

[amsterdamny]

They were right 28-32 jumper, Then im going to jump in full power via the usb, Im ready to throw it out anyway so what the hell, ill give it a try, I will post what happens in case some other poor soul bought one of these pieces of crap, Thank you for the help

 

[channelmanic]

Those programmers are decent for any lower voltage (12.5v), newer type EPROMs but are the total suck for old chips.

I use a TopMax by eeTools. It's NOT cheap but burns just about anything even remotely common that you'd ever want.

I have an old old old Data I/O Series 22 with the 064 PROM module to do the esoteric things.

RJ

 

[Riptor]

On my usb pocket programmer 3, the chip goes on the bottom of the zif.
Just a note, not all usb ports put out the same power. It may work on one pc but not another. I would rig up an external power supply and give it a shot.

 

[amsterdamny]

I Ran power direct to the usb power in on the burner, still wont work, Also tryed the jumper, nothing, I give up on this piece of CRAP!

 

[armis2000]

Not to rain on your parade, but you have that chip plugged in wrong. Pin 1 should be at the top left corner of the ZIF socket. You have the notch on the EPROM the correct way but it is plugged in at the bottom of the ZIF socket.

ken

Most EPROMs have the data and most of the address pins in the same location, so they should sit at the bottom of the ZIF, not the top... Only thing that changes are the top pins (those closest to the notch).

Is that not how it is with this particular model programmer?

 

[amsterdamny]

The chip sets in the bottom of the ziff