Ok, thanks PeteAU
It's totally still confusing because BOM #61 and BOM RTC#14 are different to some eagle layout infos.
In eagle sch layout there says C11 is tantal (without value) and C12 is 100nf and RTC info #14 says tantal C12 ???
Would be great if you can give us a corrected detailed BOM, what means "* Lots of 100nF 0805 X7R capacitors" ?....can i use everywehre 100nf except the ones you wrote in parts list for RTC?
I'm still confused
....so here is the not correct old complete "BOM" from #14 and #61:
* Lots of 100nF 0805 X7R capacitors
For 512K:
* 1 x 1Mx16bit SOJ42 DRAM
* 1 x 56pin (2x28) 2.54mm double row right-angle header (or 2x40pin and cut it)
For A500+ 1MB:
* one more DRAM
For Gary Adapter:
* more DRAMs (any number you want)
* 1 x 74F139 (surface mount) (or maybe 74LS139 is fast enough)
* 2 x 74F00 (surface mount) (or maybe 74LS00 is fast enough)
* 3 x 3-pin jumper headers
* 3 x jumpers
* 2 x 24-pin DIP sockets
* 2 x round pin strips
* Wires and some 2 and 3-pin 2.54mm connectors of your choice (see my photos from previous page).
The parts list for RTC:
U4: OKI M6242B (I got some second hand ones from AliExpress for $2)
Y1: 32.768KHz MC306 crystal
C10: 100K 0805 resistor
C13: 100nF 0805 capacitor
C12: 4.7uF 10V 0805 tantalum capacitor
R1, R2, R3: 10K 0805 resistor
R4, R5: 330-470 0805 resistor
D1: BAT721C or BAT54C diode
C14,C15: 22pF 0805 capacitor
Battery Holder: Some cheap ebay one.
Alternatively, get a RTC-62421/72421 and you can leave off Y1, C14, C15. It makes it simpler.