All A500 models had EHB.
Only very early A1000 models didn't have it (or was it some early Amiga prototypes, can't remember).
:smack:
I don't think so. My A2000 originally did not have the Denise chip that enabled half-bright mode. I purchased it and added it in later. So I surmise that A1000s did not have them originally either, nor A500s produced about the same time as my A2000. (Were A1000s still produced after The A500 and A2000 came out?)