Datron 4708 firmware need

[Cage03]

Hi, Have anybody Datron 4708 eprom dump file?

[coromonadalix]

At KO4BB  website you have some manuals and some stuff,  but no eeprom dump

http://ftb.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Datron

[doktor pyta]

If You  won't find anything within a week I will try to prepare dumps for You.

[Cage03]

I only found the dump file 4808. I would be very grateful for your help.

[doktor pyta]

OK, I'm faster than I thought.

Below You will find dump of M18 EPROM.

http://rfscientific.eu/sites/default/files/articleextra/eprom_datron_4708.zip

[doktor pyta]

@Cage03
Can You share some photos, details about Your repair?
Was Your M18 EPROM corrupted?

[Cage03]

Today I will continue to repair and give here some more info and photos.

[Cage03]

My M18 eprom has a fault, 8 bytes are OK, another 8 bytes always have 0 on the second bit.
Other differences are due to different firmware versions, but 4708 is running.

There is still some defect on the AC board because the Reference Divider
control voltage is only from 0 to 8 V and when I remove the AC board is to 20 V.

[doktor pyta]

First of all check output of M3 optocoupler on REF Divider board.
It carries 16kHz reference clock for PLL in AC synthesizer.
When this signal is not present, the amplitude and frequency of AC are behaving very strange.

[perdrix]

IIRC there are two programmable devices on the 4808 CPU board.  I assume this is for the main ROM - M18?  Has anyone ever grabbed the content of the M3 address decode PAL?

Where did you find that ROM image please?

Thanks
David