MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 burning failed eeprom 27c322

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T O P I C    R E V I E W
needle Posted - 10/23/2010 : 11:42:35
Hello everybody,

i searched google for a solution to my problem and came across these forums. i read some of the topics on problems with the 27c322, but it didn't really helped me, so i hope you guys can help me out.

last week i ordered a Willem EPROM Programmer PIC BIOS PCB5.0E. Together with the 16bit adapter for the 42pin 27c322.

also i got myself 10x 27c322 eeproms

so far so good. got everything, i thought.

now when i burn to the chip it get's to 100% and then gives an error:

0x000000 chip 0x10 buffer 0xff

i used an external power supply 12v 1A

the dip switches are in the correct setting

the eeproms are empty, i've checked

what could possibly be wrong here?

i would very much appreciate some help on this.
6   L A T E S T    R E P L I E S    (Newest First)
ZLM Posted - 11/19/2010 : 22:14:13
most likely you do not need change the twp and twc, but you can try.

Two A19 are same. Connect one of them.
needle Posted - 10/24/2010 : 02:27:43
also in the datasheet i find:

ACCESS TIME: 80ns
PROGRAMMING TIME: 50žs/word


but in the program it says
twp = 140
and twc = 20

do i need to change these settings?

needle Posted - 10/24/2010 : 02:04:39
quote:
Originally posted by ZLM

J1 jumper need to set to 27C322, address wires A19,A20,A21 need to be connected.



Hey ZLM, thanx for answering!

i'm not really sure though which A19 you mean.... my board has two of them???
also i cant find jumper settings for where it says J1.

here's a picture

h p://b.imagehost.org/0945/willemprog.jpg

if i'm right, i should just connect the boards A19,A20,A21 to the adapters A19,A20,A21?
ZLM Posted - 10/23/2010 : 22:33:57
J1 jumper need to set to 27C322, address wires A19,A20,A21 need to be connected.
needle Posted - 10/23/2010 : 15:02:54
also checked on the 32ZIF socket pin 1 = 12.67Volts and pin 32 = 5.21Volts
needle Posted - 10/23/2010 : 13:44:26
i tried reading back the roms and it seems it only fills the rom with 04040404040404 etc..

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