| T O P I C R E V I E W |
| SimonZ |
Posted - 06/23/2024 : 11:38:43
Hi to all, i'm new.
I have the GQ-4x4 and would like to use it to read the chip in question, specifically the HD6473308CP (84-PIN PLCC not windowed).
The chip is NOT officially supported and requires an adapter that allows you to read the PROM inside it like a normal HN27C256 which is instead supported. The manual on page 244 shows the pin-to-pin connection diagram so I decided to build one myself.
When I go to read the chip, only 00-00 appear in the buffer up to the address 3FFF and then from the address 4000 onwards all FF-FF. What I see should correspond to what the manual says (in fact the chip only has 16KB even if it reads like an HN27C256 which has 32KB). Given that the chip certainly contains data, the adapter has no short circuits and the signals arrive correctly at the respective pins, what I'm wondering though is:
What am I missing? Could I simply solve the problem with the 9Vdc external power supply that I'm missing or do I really need an ad hoc adapter (for the H8/534 I actually see a capacitor and a resistor)? Do we need official support perhaps for some algorithms?
MANUAL
https://drive.google.com/file/d/1UMEnFIMv2WEkx3bDwn_fQS3wusgngwQG/view?usp=drive_link
My Adapter
534 Adapter
 |
| 9 L A T E S T R E P L I E S (Newest First) |
| anniel |
Posted - 06/28/2024 : 11:18:52
quote:
Originally posted by SimonZ
I've found an explanation perhaps..
I think my adapter works properly but the H8 it was programmed using a security features that I didn't know he had.
This is the application notes where explain this option (pages 21-22-23 of the pdf)
https://drive.google.com/file/d/1n_DSOA58NnEMlbuHQ3jFN-p5cL-HlcNh/view?usp=drive_link
If this feature is enabled, user will read only "00" exactly what happens to me.
So the new question now is:
Has anyone had similar experiences? Is it possible to bypass this protection somehow?
The AN says to pull P80 and P81 high and your adapter is providing this. |
| SimonZ |
Posted - 06/28/2024 : 08:49:43
I've found an explanation perhaps..
I think my adapter works properly but the H8 it was programmed using a security features that I didn't know he had.
This is the application notes where explain this option (pages 21-22-23 of the pdf)
https://drive.google.com/file/d/1n_DSOA58NnEMlbuHQ3jFN-p5cL-HlcNh/view?usp=drive_link
If this feature is enabled, user will read only "00" exactly what happens to me.
So the new question now is:
Has anyone had similar experiences? Is it possible to bypass this protection somehow? |
| anniel |
Posted - 06/27/2024 : 05:15:04
quote:
Originally posted by SimonZ
Yes you are right anyway my doubt is:
Why if the H8/534 can be read as HN27C256 like the H8/330 for the 534 is there a resistor and capacitor in the adapter?
Probably VCC smoothing for the cap. The resistor is maybe a pullup or pulldown for the security jumper. |
| SimonZ |
Posted - 06/26/2024 : 02:51:39
Yes you are right anyway my doubt is:
Why if the H8/534 can be read as HN27C256 like the H8/330 for the 534 is there a resistor and capacitor in the adapter? |
| anniel |
Posted - 06/25/2024 : 10:18:09
quote:
Originally posted by SimonZ
Update:
I purchased a 9Vdc power supply but the problem was not resolved. I suspect the chip is faulty or specific support is needed for this model and/or its adapter.
I made the request from the program but I imagine it won't be a short thing as long as the proposal is accepted...
HN27C256 is supported if the adapter is properly set up it should work as a regular DIP. |
| anniel |
Posted - 06/25/2024 : 10:15:10
quote:
Originally posted by SimonZ
Sorry in the picture 5 connections are missing, I took the photo during production... it's just an example to understand the DIY level but in the end 42 wires are connected to all 28 pins like a manual
I understand. |
| SimonZ |
Posted - 06/25/2024 : 08:18:43
Update:
I purchased a 9Vdc power supply but the problem was not resolved. I suspect the chip is faulty or specific support is needed for this model and/or its adapter.
I made the request from the program but I imagine it won't be a short thing as long as the proposal is accepted... |
| SimonZ |
Posted - 06/23/2024 : 12:43:33
Sorry in the picture 5 connections are missing, I took the photo during production... it's just an example to understand the DIY level but in the end 42 wires are connected to all 28 pins like a manual |
| anniel |
Posted - 06/23/2024 : 12:08:46
quote:
Originally posted by SimonZ
Hi to all, i'm new.
I have the GQ-4x4 and would like to use it to read the chip in question, specifically the HD6473308CP (84-PIN PLCC not windowed).
The chip is NOT officially supported and requires an adapter that allows you to read the PROM inside it like a normal HN27C256 which is instead supported. The manual on page 244 shows the pin-to-pin connection diagram so I decided to build one myself.
When I go to read the chip, only 00-00 appear in the buffer up to the address 3FFF and then from the address 4000 onwards all FF-FF. What I see should correspond to what the manual says (in fact the chip only has 16KB even if it reads like an HN27C256 which has 32KB). Given that the chip certainly contains data, the adapter has no short circuits and the signals arrive correctly at the respective pins, what I'm wondering though is:
What am I missing? Could I simply solve the problem with the 9Vdc external power supply that I'm missing or do I really need an ad hoc adapter (for the H8/534 I actually see a capacitor and a resistor)? Do we need official support perhaps for some algorithms?
MANUAL
https://drive.google.com/file/d/1UMEnFIMv2WEkx3bDwn_fQS3wusgngwQG/view?usp=drive_link
My Adapter
534 Adapter
Can you identify pin 14 and pin 28 it looks there is missing connections. Or did you wire them differently? |
