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DIP28 -> DIP23 Adapter or Circuit
Posted: Sun Oct 17, 2004 9:15 pm
by Borg Number One
I have got many DIL28/DIP28 EEPROMS (from old mainboards) for example:
AT27C256R (Atmel)
NM27C5120-150 (NATIONAL Semiconductors)
TMS27C512-15 (Texas Instruments)
AM27C512-155DC 150B821 (AMD)
and I would like to use them.
Exist adapters / "converter circuits" which make it possible to use them with a DIL32 socket?
If not, would it be possible to build such "converter circuits"?
Posted: Mon Oct 18, 2004 1:20 pm
by sulbert
At least first one is OTP EPROM according to the datasheet. Adapter building instructions can be found
here (in German).
Posted: Thu Oct 21, 2004 10:59 pm
by Tomasz
Sulbert: any link in english, please..?
Tomasz.
Posted: Sat Oct 23, 2004 4:17 pm
by Borg Number One
Code: Select all
DIL/DIP28 DIL/DIP32
1 O O 17
O O
1 O O 15 O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
14 O O 28 16 O O 32
Referring to this:
http://www.geocities.com/SiliconValley/ ... re.html#6i
How is it possible to put pin 14 + 15 of the 28-pin sockel to pin 16 +17 of the 32pin sockel?????????
(Only this would possible/realizable:
Either putting pin 14 to pin16 or pin 15 to pin 17.)
Is it possible to stretch DIPs now????
Or do you mean this?
Code: Select all
DIL/DIP28 DIL/DIP32
0 O O 16
O O 17
0 O O 14 O O
O O 15 O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
13 O O 27 15 O O 31
Posted: Sat Oct 23, 2004 6:58 pm
by Rainbow
DIPs are always numbered like this:
Code: Select all
1 O O 28
O O
O O
O O
O O
O O
O O
O O
O O
O O
O O
O O
O O
14 O O 15
General rule for inserting smaller DIPs is this:
Code: Select all
DIL/DIP28 DIL/DIP32
1 O O 32
O O
1 O O 28 O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
O O O O
14 O O 15 16 O O 17
This applies also to DIP cache chips on older boards.
However, you might have to connect the VCC pin of the chip to 5V instead of the socket.
Posted: Sun Oct 24, 2004 2:13 am
by Borg Number One
In conclusion this would be the solution to build a 28-to-32-pin-socket-adapter to read the content of the 28pin (E)EPROM/FLASHROM.
Code: Select all
DIL/DIP28 DIL/DIP32 DIP28 (socket)=>DIP32 socket
(VCC)
1 O O 32
O O
1 O O 28 O O 1=> 3 28=>32(!) 28 should not be connected to 30
2 O O 27 O O 2=> 4 27=>29
3 O O 26 O O 3=> 5 26=>28
4 O O 25 O O 4=> 6 25=>27
5 O O 24 O O 5=> 7 24=>26
6 O O 23 O O 6=> 8 23=>25
7 O O 22 O O 7=> 9 22=>24
8 O O 21 O O 8=>10 21=>23
9 O O 20 O O 9=>11 20=>22
10 O O 19 O O 10=>12 19=>21
11 O O 18 O O 11=>13 18=>20
12 O O 17 O O 12=>14 17=>19
13 O O 16 O O 13=>15 16=>18
14 O O 15 16 O O 17 14=>16 15=>17
Can this adapter be used to write data too?
Posted: Mon Oct 25, 2004 11:30 pm
by Tomasz
Look out to merge chip 28DIP with chip 32DIP!
According to, for example, Atmel's chip:
AT28C64B (28DIP) --> AT29C010A (32DIP, comon flash memory for BIOS'es upgrades) - comparing pins as described in Atmel's datasheets:
28DIP 32DIP
........................................ NC-1 | | 32-VCC (5V)
........................................ A16-2 | | 31-WE
NC-1 | | 28-VCC......... A15-3 | | 30-NC
A16-2 | | 27-WE............ A12-4 | | 29-A14 - leave not conn.
A15-3 | | 26-NC............ A7 -5 | | 28-A13 - leave not conn.
A12-4 | | 25-A8............. A6 -6 | | 27-A8
* | | * ........................... * | | *
GD-14 | | 14-I/O3...........GN-16| | 17-I/O3
and in 32DIP (2)&(3) - leave not connected..!
Now I try to connect socket 28pins with socket 32pinsP and flash
smaller chip via such "adapter" with UNIFLASH... I need much luck, I suposse!
Tomasz.
Posted: Tue Oct 26, 2004 1:32 am
by Borg Number One
-delete this-
Posted: Tue Oct 26, 2004 8:24 am
by Tomasz
Borg - it is what I mean!
Tomasz.
Posted: Tue Oct 26, 2004 8:56 am
by Borg Number One
-delete this-
Posted: Thu Oct 28, 2004 11:16 pm
by Tomasz
YES! But they should be:
DIP28: 28=>32 DIP32
DIP28: 27=>31 DIP32
DIP28: 26=>30 DIP32
DIP28: 25=>27 DIP32
DIP28: 24=>26 DIP32
etc...
So, VCC to VCC in DIP28 & DIP32! (28=>32)
DIP32: 28.&29 - not connected.
Next time I give foto of my "adapter", OK?
Tomasz, POLAND.
Posted: Thu Nov 04, 2004 12:36 am
by Tomasz
Well, I've tried to hot-swap flash AT28C65B with Uniflash. I hot-swapped in mobo "5v-1A" BIOS socket but it seems uniflash does not support chip AT28C64B... But if that chip will be implemented into Uniflash..?
I used combination of two "precision" sockets 32DIP --> 28DIP, and prepared their pins for socket 32DIP. Details: next letter with Photos.. B-)
Tomasz, POLAND.
Posted: Thu Nov 04, 2004 1:58 am
by Borg Number One
Yeah...photos please...
Photos in this way:
Code: Select all
DIP28
--------------
--------------
||||||||||||||
||||||||||||||||
----------------
Sockel: DIP32
Posted: Thu Nov 04, 2004 11:32 pm
by Rainbow
Tomasz wrote:Well, I've tried to hot-swap flash AT28C65B with Uniflash. I hot-swapped in mobo "5v-1A" BIOS socket but it seems uniflash does not support chip AT28C64B... But if that chip will be implemented into Uniflash..?
This is an EEPROM so there is no identify command -> no autodetection. However, it might be possible to implement EEPROM support by (ab)using the -force parameter...sometimes.
Posted: Fri Nov 05, 2004 11:22 pm
by Borg Number One
@Tomasz:
Code: Select all
DIL/DIP28 DIL/DIP32 DIP28 ((E)/EPROM/Flashrom/socket)=>DIP32 socket
(VCC)
1 O O 32 1 |===>32
O O 2 ||==>31
1 O O 28 O O 1 3 28=|||=>30
2 O O 27 O O 2=> 4 27==|| 29
3 O O 26 O O 3=> 5 26===| 28
4 O O 25 O O 4=> 6 25=====>27
5 O O 24 O O 5=> 7 24=====>26
6 O O 23 O O 6=> 8 23=====>25
7 O O 22 O O 7=> 9 22=====>24
8 O O 21 O O 8=>10 21=====>23
9 O O 20 O O 9=>11 20=====>22
10 O O 19 O O 10=>12 19=====>21
11 O O 18 O O 11=>13 18=====>20
12 O O 17 O O 12=>14 17=====>19
13 O O 16 O O 13=>15 16=====>18
14 O O 15 16 O O 17 14=>16 15=====>17
@DIP32
2, 3, 28, 29 are not connected.
Is this correct now?
Well, I have built a small unit/component which makes it easier to change EEPROMS.
You can see a testsocket with a lever to de/attach EEPROMS.
On the testsocket I soldered a normal DIL 32 Socket, because the pins of the testsocket are to wide. So it would not suit into the Mainboard-Sockel.
However the soldere sockel makes it possible.
@Rainbow
...please insert a switch which makes it possible to write/read data to/from the (E)EPROM/PROM-Sockel even if no chip was detected.
So it would be possible to read/write (E)/E/PROMS which have no identification.
In conclusion this would be the solution to the mentioned problem.