*** M E M O R U M ***

--Have we given you tips on the best way of removing soldered in chips?
Yes sir. I don't think i have the tools to try to salvage the IC, neither is there much point in trying to do so.
Thank you.

Thank you for the help. I'll get back with the results (again, it might take a while to get the 4116 and to test the ram).

Hello, thank you for the answers and sorry for my late reply, but the time did not permit to continue on this project until now. So to recap what have I done until now: 1.) I measured the voltages on some of the IC-s that made sense to me (please alert me if i missed something obvious). Please see t...

So using 4164 and modifying it, is just "crippling" it to work as 8k. Got it, thank you.
If I'm socketing everything i would also prefere to use 4116 as the price is the same and i don't need to modify them.

Will report back when i'll make any progress. Thank you!

Apologies, the current state of the machine is: I have not changed the configuration of the memory (it runs in 64 mode with that weird doughter board). The only change has been general cleaning of the pins. You're not bold, i'm preaty shure you all have vastly more experiance than me, and you have m...

Sorry for my ignorance, can you please elaborate what R10 is and where might i find it? Is it a resistor or something else? It would seem, it would be a good idea to check the voltages on the board at this point. Thank you.

Hello, yesterday i was again thinkering with the machine. 1.As promised the picture of the underside of the custom PAL board. IMG_20190611_155201.jpg IMG_20190611_160810.jpg 2.) I have cleaned all of the socked IC pins and made some progress: IMG_20190611_170054.jpg IMG_20190611_165815.jpg -at the b...

Thank you for the answers. 1.) If that will be ready to use or as a kit with all the components (preprogrammed ROMs) I would be interested in purchasing it. 3.) I will check the manual thank you both. 5.) I would like the high level schema (i'm not shure if this is the correct term for it), so i can...

First of all, sorry for late reply and thank you for your answers. 1.) Regarding EEPROMs it sounds like a good idea but the friend does not have an EEPROM burner yet. So this suggestion will have to wait, I'm also reluctant in modding the machine before i get it to a working order. (However i saw so...

4.) PL50?? (middle one from the three, right of Z80)(i can't read the schematic- where can I find one in hi res?) has been replaced at some point as the soldering marks are clearly visible. IMG_20190604_115706.jpg IMG_20190604_115713.jpg 5.) When i turn the computer on i get the following picture on...