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No neviem, ale napríklad vyletované pamäte s nie úplne rovnými nôžkami do precíznej pätice nedostanem, nehovoriac o tom že zvyšky cínu... Čo je na tých čínskych zlé? Možno by stálo za to porovnať ich po stom použití, nové+vyletované obvody, že v akom stave bude tá precízna a v akom tá čínska pätica.

Za mňa jednoznačne tantaly. V Didaktiku M z roku 1990 stále fungujú pôvodné. Za to elektrolyty vysychajú, alebo čo je horšie, vytečú a rozožerú spoje. U mňa platí rovnica tantal > elektrolyt. Navyše vadu tantalu je hneď poznať (má akustickú + svetelnú signalizáciu poruchy ), za to vyschnutý elektrolyt nie, a potom sa jeden diví že sa mu odpálila už ôsma pamäť a nevie prečo.

O cene som nepísal nič, práca niečo stojí aj keď je to ako hobby. Tiež by som si nechal zaplatiť.

Nebyla by tam ještě jedna zastrčená??

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Praxe znamená, že vše funguje, ale nevíme proč. Teorie znamená, že vše víme, ale nic nefunguje.
Někdy je teorie spojena s praxí. Znamená to, že nic nefunguje a nikdo neví proč ...

Hello. Sorry for asking this but is the 008 schematics publicly available after so many years? Or at least the gerber files for the 008 PCB? I have one old Jetprog programmer and I'd like to use it for the 2708 EPROMs instead of building/buying this standalone programmer or the overpriced elnec adapter:

https://www.mattmillman.com/projects/hveprom-project/an-easy-to-build-programmer-for-2704-2708-mcm68764-mcm68766-eproms/

Thank you.

V prílohe schéma a sken neosadenej dosky pre modul 008. Modul 008 funguje iba s programátorom PREPROM-01 a PREPROM-02.
Tu (uložto) je schéma programátoru Centronics Eprommer, ten je podobný tomu PREPROM-01. Tiež je tam software pre PREPROM-01.

Great! Thank you!

I am reporting success with my jetprog programmer with a handmade 008 adapter with elnec software 2.74 that seems somewhat buggy right after programming and prior verification but that is manually bypassed. Couldn't find version 2.75 which is advertised as the last that supported 008. I modified the 008 to accept directly a 12V/1A contemporary switching mains adapter (from a widespread router) which eliminated the need of the 78L12 and made some other minor modifications to make it work probably with off-the-shelf generic components I already had like "ordinary" PN diodes. I used 2N4403 transistors.

I looked at the pictures of the more complicated 2708 adapter but it is hard to tell from them the proper circuit despite it seems to be based on 008 too.

somewhat buggy...
That software work like this:
It write N+2xN times, but maximal 100 times.
N is counted write+verify cycles to verified data be valid.
So for some 2708 chips it write+verify 3 times, for some chips more times. I was not find any bug while I was programmed 2708 with this software.

Programátor PREPROM-01 programuje 2708 takto:
Zapíše N+2xN cyklov, spolu maximálne 100 cyklov.
N je počet programovacích cyklov po ktorých je už obsah identický.
Takže pri niektorých pamätiach to opakuje zápis+overenie 3 krát, pri niektorých podstatne viac krát. Osobne som žiadnu chybu v programe pri programovaní 2708 nenašiel.

On the contrary, it is a well persistent bug that appears right after programming (which luckily is successful) and verification. Appears in both versions I tested -- 2.74 and 2.51 that I could find presently available on the internet and that support 008 module.

This program I see first time. I was used that attached DOS-based application for programmer under plain MSDOS 6.00, it was in DOS text mode, and there was no bug.

Well, this is the interface of the standard Elnec's PG4UW software which is even in the last version. The version pictured is 2.74 that is from 2010 as I mentioned before. I don't mind DOS but my Jetprog programmer is not supported by PG4U for DOS which reports that my programmer has inappropriate firmware (probably too new for that DOS software). Still curios about the schematics of more contemporary 2708 module if it becomes available some day.