@orb85750
I ensure you that an unexpanded Amiga 1200 can replace an A500 for about 90-95% of the A500 games/demos.
The best degrader is TUDE. You can install it in your HD. No need to insert a degrader disk first.
If your amiga is an escom model, you will most likely need to apply the hardware "floppy disk fix" as it came out with a fault. Search Aminet and this forum about it.