Forum ,
Hopefully someone can help me with a small problem i face.
Since i am completely new to willem programmers i gathered info first , and thank ezo for his support , but.............
I am trying to read an 27c1024 plcc44 chip , but cannot get info.
i have a working willem , dip40 adapter board , and an plcc to dip40 adapter .
i have verified the willem by programming several eproms ( 27c256 , 512 ) , by flashing some 49lf004a , by resetting and programming an 29ee010 , and by reading and programming several 27c4096 on the dip40 adapter board.
All these tests worked out okay.
However when i insert the plcc44 to dip 40 adapter with the 27c1024 chip , the willem indicates it is empty.
A test of the same WITHOUT the plcc44todip40-adapter ( and chip ) showed me the same result ( willem responds with chip is empty message ) .
Can anyone please shine a light on this problem as reading the 27c1024 is the only reason i bought all kit.
techy
== SOLVED == info needed to read an 27c1024 plcc44
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- DIP40-EPROM%20lr.jpg (32.7КБ)4150 просмотров
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- plcc44%20to%20dip%2040.jpg (19.23КБ)4150 просмотров
Последний раз редактировалось techy Чт май 17, 2012 10:05 am, всего редактировалось 1 раз.
Re: info needed to read an 27c1024 plcc44
1) Here is no difference in 27C4096 and 27C1024 process with 40pin 16bit eprom adapter , Willem HW/SW. I recomend clean PLCC chip pins sideward softly , recheck chip contacts through adapters, check chip from bottom for corner pin status, try to move chip in socket (lift up a bit).
2) Get 27C1024 datasheet with dip40 and plcc44 connection diagram . Check PLCC44 to DIP40 adapter pins connections according 27C1024 . Some adapters, for example PLCC44 to DIP40 for MCU PIC or AVR MCS-51 have different connections, NC pins in PLCC44 are different .
2) Get 27C1024 datasheet with dip40 and plcc44 connection diagram . Check PLCC44 to DIP40 adapter pins connections according 27C1024 . Some adapters, for example PLCC44 to DIP40 for MCU PIC or AVR MCS-51 have different connections, NC pins in PLCC44 are different .
Re: info needed to read an 27c1024 plcc44
Thanks for your advice ,
I verified the plcc to dip adapter , and found the following ;
Dip pin 11, 30 ( gnd ) was NOT connected to Plcc44 pin 12 , 34 ( gnd ) .
and infact , dip pin 30 ( gnd ) was connected to plcc pin 33 ( nc ) .
This ofcourse rendering the plcc 27c1024 without power.
After modifying the plcc adapter , EUREKA it worked
Next job will be programming an atmel atmega32 with the isp adapter cable ( i need to make that one ).
TECHY
I verified the plcc to dip adapter , and found the following ;
Dip pin 11, 30 ( gnd ) was NOT connected to Plcc44 pin 12 , 34 ( gnd ) .
and infact , dip pin 30 ( gnd ) was connected to plcc pin 33 ( nc ) .
This ofcourse rendering the plcc 27c1024 without power.
After modifying the plcc adapter , EUREKA it worked
Next job will be programming an atmel atmega32 with the isp adapter cable ( i need to make that one ).
TECHY
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- finished.jpg (64.95КБ)4123 просмотра
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- modified gnd flat.jpg (74.15КБ)4123 просмотра
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- modified gnd.jpg (74.78КБ)4123 просмотра
Re: info needed to read an 27c1024 plcc44
Atmega32 not supported via isp adapter cable.Next job will be programming an atmel atmega32 with the isp adapter cable ( i need to make that one ).
Extra oscillator and connection to 25xxx socket required.
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- avr.zip
- (29.75КБ)346 скачиваний
Re: info needed to read an 27c1024 plcc44
Hi ezo ,
Someone uses this isp 6 pin adapter
Will it work ??
techy
Someone uses this isp 6 pin adapter
Will it work ??
techy
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- ISP.jpg (25.71КБ)4120 просмотров