I’m trying to resurrect a Craigslist Amiga A1000. After replacing Paula it now boots. Several basics still missing (RF shields, screws, port covers, etc.) but essential electronics are okay.
However, I would like to add the 256 KB RAM expansion but I haven't been able to locate one. I have been able to recreate much of the schematic for much of the A1050 (thanks to Raffzahn for excellent information), but not sure of 2 things - 1) capacitors, and 2) the black blob:
- My guess is 8 the capacitors are 220 nF but don't know about the other one (c9?). I think they are connected between 5 V and GND?
- The blob maybe a 39 Ω resistor pack to buffer the address lines? Or?
Any insights/thoughts/facts appreciated.
Back of board: Source: http://amiga.resource.cx/exp/a1050
224on one of them, i.e. 220nF. The "black blob" is probably 8×39Ω 5% resistors wired straight across (pin 1-16, 2-15, 3-14, 4-13, 5-12, 6-11, 7-10, 8-9).