On 05/12/2019 12:59, Gerrit Heitsch wrote: > > Well, it's a 6502 core plus some I/O, rated for 2 MHz (will still run > at 2.2 MHz though (*)). The closest relatives would be the 8500 in the > C64 and then 8502 in the C128. > > From the numbering, the 8500 was started first, but I think the 8501 > came to market first. Agreed; see below: I think the time line is something like: 6509 -> 6510 -> 7501 -> 8501 -> 8500 or 8502. The 6509 and 6510 have their sync pad logic moved from the left to the top of the die and my guess is that 6509 just came before the 6510 just because of the numbering. The 8501 still contains some left overs of the SYNC at the top where the bias generator now resides. Therefore I guess that it came first or at the same time as the 8500 jsut has some wires removed or cut (compared to the 8501). 8502 might just be another bond-out of the 8500 die... but I haven't seen shots yet.Received on 2020-05-29 23:43:33
Archive generated by hypermail 2.3.0.