# [PIC]Problem In Eprom P87c51

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#### venom1568

##### Newbie level 4
Dear All

I have problem In Eprom Intel P87C51 , i have Group of eprom contain ( 4 EPROM )

The main eprom which have the code of general programe didn't work , iam trying

to read it and find in the last of code this four lines contain (FF) , IS this logical in programming ? and there anyway to find tool to check this code to find any Errors found ?

Best Regards

Code:
101F90006660CF80D6E53FB40C0040E90566E56693
:101FA000B406DF80BDE4A20433FE22C2A3E4750DB3
:101FB000FFB50DFD753E4F22FFFFFFFFFFFFFFFF47
:101FC000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF21
:101FD000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF11
:101FE000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF01
:101FF000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF1
:00000001FF

#### venom1568

##### Newbie level 4
FF is erased EPROM and can be expected after executable code. How's the EA pin connected in your design? If it's high, the program starts to excute from internal EPROM.

I wanna to note . this isn't original Eprom Which come in the board . This group of Eprom Contain (4) pcs of Eprom . 3 pcs have 30 pin , and the main P87C51 Intel DIP 40 (as I think) when iam trying to changing this group to other new group from authorized Provider give me error in LCD DISPLAY . when only change the P87C51 ' GROUP TO ORIGINAL which come in vision fro Mfr . RUN ok without any error . So the problem in P87C51 So i think may be the source code had syntax error and iam trying to read it and found this 4 lline had "FF" , As i know i think that's not logical to end source code With "FF" , the problem is " i can't read P87C51 INTEL DIP 40 ORIGINAL TO compare it with the new one which come with group.

How's the EA pin connected in your design? If it's high, the program starts to excute from internal EPROM ?
I need to explaining me what's u mean . If as i understand it's high .

#### FvM

##### Super Moderator
Staff member
FF is erased EPROM and can be expected after executable code. How's the EA pin connected in your design? If it's high, the program starts to excute from internal EPROM.

- - - Updated - - -

As i know i think that's not logical to end source code With "FF"
I see that you don't understand how source code is related to binary image. The banked 8051 code structure makes it's likely to have small empty (FF filled) locations at the end of each 256 byte code section.

I guess, you are either trying to use EPROMs with incompatbile content, or there's some problem not yet mentioned in your post.

venom1568

### venom1568

Points: 2

#### venom1568

##### Newbie level 4
Dear FvM

In shortly P87C51 " original " When Trying To read It Give Me " FF " and it's working Good Without any Problem . When Iam Trying To Read The " New " Give .
Code:
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:1000000002001BC0D0C0E002173000C0D0C0E00228
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:00000001FF

And didn't work . are u think "Original' Eprom LOCKED and had difrrent content the New so error Disappear ? . I using MINIPRO universal programmer to read them .

Best Regards .

#### FvM

##### Super Moderator
Staff member
Yes, reading all FF means the device is locked. Unfortunately there's no way to compare it against the new device.

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