>>> Back then the CIAs were also labled 6526R4. MOS dropped the 'R4' >>> later. Gives you an idea how long it took to get those working. :) >> >> Not terribly long IMO. They shipped earlier revisions than that. > > Those must have had some kind of bug though, or why would MOS start > a new revision? There are many reasons... Yield, timing tunings (which is also yield, it gives you a better sort), or indeed fixes for (perhaps critical) bugs. > The oldest CIA I have so far is a 6526R4 with a 2383 datecode. The oldest I have heard of is week 14 of 1983; those come without the R4 marking. Some time in 1983 or 1984 they switched to without R4 marking again (what revision is in there, I have no idea). The last weeks of 1985 got us the 6526/S (whatever that is), and in 1987 they switched to the 8521 (marked as 6526A, 216A). Segher Message was sent through the cbm-hackers mailing listReceived on 2011-12-11 12:00:03
Archive generated by hypermail 2.2.0.