rsilvers@hawk.CS.ULowell.Edu (Robert Silvers) (11/03/87)
Hi,
Does anyone know the video bandwith of the 2002 and 1080 monitor?
I suspect that it is about 10 Mhz, but am not sure. Also, what is the
access time of the RAM in ns. For the IMB pc you can buy RAM of
various speeds (120ns, 80ns etc.) What is the Amigas? Is it different
for fast and chip mem? One other thing. How many accumulators are in
a 68000, I am curious and have no books handy.
Thanks.
--Rob.
|--------------------------------------------------------------------------|
|Robert Silvers. |
|University of Lowell. ______ |
|--------------------------------------------------------------------------|grr@cbmvax.UUCP (George Robbins) (11/15/87)
In article <1943@ulowell.cs.ulowell.edu> rsilvers@hawk.cs.ulowell.edu (Robert Silvers) writes: > > > Hi, > Does anyone know the video bandwith of the 2002 and 1080 monitor? > I suspect that it is about 10 Mhz, but am not sure. Yep, 10 MHz in either case... > Also, what is the > access time of the RAM in ns. For the IMB pc you can buy RAM of > various speeds (120ns, 80ns etc.) What is the Amigas? Is it different > for fast and chip mem? The Amiga uses 150 nS DRAM chips, and there is no particular benefit to using faster ones. The chip memory can run two complete memory cycles in each 560 nS period. Fast memory only executes one memory cycle in each 560 nS period, but avoids any contention between the processor and Amiga custom chip activity. > How many accumulators are in > a 68000, I am curious and have no books handy. A 68000 has 16 registers, 8 of which are called data registers and and be used in almost any instruction format and 8 called address registers which have more restricted use. Making this functional distinction allowed the 68000 designers to utilize 16 registers without making the register with in the instruction format always be 4 bits wide. It's not clear whether this is really a good idea, but it seems to work ok. -- George Robbins - now working for, uucp: {ihnp4|rutgers|allegra}!cbmvax!grr but no way officially representing arpa: out to lunch... Commodore, Engineering Department fone: 215-431-9255 (only by moonlite)