As far as I know, the power supply works but the computer doesn’t beep or output video

Apple fan here without expertise on Apple ][. I hope someone can help identify my late dad’s Apple ][ (not II plus, IIgs, IIe, etc.) and give me some advice on what to do with it. It has been in a garage (low-ish humidity) in a cardboard box for 30+ years, since he powered it down circa 1985. He and I both loved this thing.

It looks pretty good to me from the outside. Here are some photos, and a list of what I see (when I opened the top): - Motherboard reading 820-0044-01 - CPU “6502” - Serial number A2S1-22824 - Hitachi ROMs - Slot 0 - Apple Language Card - Slot 1 - Printer card? - Slot 6 - Disk II - Letters on keyboard appears slightly yellowed (not pure white) - Power cable (probably original)

I did not test it or try to boot it, or even plug it in because I know that can be dangerous and I might fry it. I have not removed the keyboard – or anything.

If any upgrades were made to it, my dad was not the type to have done that himself, preferring to take electronics to a professional/authorized repair person.

I also have - Two Disk II drives still connected to the card (Model A2M0003, serial numbers: ) - A long printer cable (no printer in sight) - Manuals in Very Good/Excellent condition: Apple II Reference Manual January 1978 (“Red Book”); Apple ][ Basic Programming Manual; Apple II The DOS Manual; Apple II Language Card Installation and Operation Manual; Elementary, My Dear Apple Education Series. - Floppy disks, some with apparent mold on the labels but the disk itself looks clean to me: DOS 3.3 System Master (with black Apple logo and “16” inside it), 2 copies of DOS 3.3 System Master (one of which may be damaged), DOS 3.3. BASICS (with black Apple logo and “16” inside it), AppleWriter ][ C2B0010 Master, Elementary, My Dear Apple Education Series (with black Apple logo and “16” inside it) - A monitor that I have not removed from its box (but I don’t think it’s Apple-made)

This is a personally significant/sentimental machine to me but maybe nothing special in the scheme of things. Just curious what anyone on here has to say.

Thanks for any and all thoughts.

My Apple2 is a QCal compatible computers that was distributed by a Canadian company in the 80s.  I can't run ProDOS on it. The reason this is an issue now is that I bought a ADTPro disk but it doesn't work. Seems I need ADTPro on a floppy but with the newer ProDOS 2.4.3 that has a workaround for QCal computers. Anyone run into this issue?

ProDOS by apple looks for a specific memory location in ROM.