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- Amiga
-
-
- a 16 bit C64
-
- Although many wont realize it, the C64
- is still going strong after more than
- ten years since its birth. How has it
- managed to thrive long after it's
- expiratory date? Well it's a
- combination of many things, such as
- it's ability to produce high quality
- graphics and sound. The main reason
- though, is that there is no limit to
- what can be done on it. The way that
- it's put together means that, with
- perseverance, almost anything is
- possible.
-
- Looking at the Amiga shows a similar
- story. In fact, a comparison between
- the C64 and the Amiga shows that they
- have more in common than just their
- manufacturer. It's apparent that the
- designers of the Amiga have used the
- C64 as the basis for their design, and
- it's because of this foundation that
- the Amiga is such a fantastic machine.
-
- @IPcamC
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- First consider the processor
- arrangement; the C64 has one main
- processor (a 1 Mhz 6502 chip) along
- with custom graphics and sound chips
- (VIC2/SID chips respectively). The
- Amiga also has a main processor (in
- this case, the 7.14 Mhz Motorola
- 68000) along with two custom graphics
- and sound chips. Consider also the
- various graphics modes. The big one
- for the Amiga is the HAM mode which
- allows placement of all available
- colours onto the one screen. The C64
- also has just such a mode (several in
- fact), but the best one is called FLI
- which stands for Flexible Line
- Interpretation. This is a bitmapped
- display, just like the Amiga's HAM.
- The sprite faculties on both machines
- are also quite similar. 8 sprites are
- available on both machines and they
- both allow vertical splitting of all
- eight. On the C64, the programmer has
- the option of using UDG's (User
- Defined Graphics) which are not
- operated via the graphics chip, and
- likewise, the Amiga has BOB's which
- are objects created by the processor/
- blitter. The Amiga has an Overscan
- mode which allows graphics to be
- displayed in the border. By careful
- programming of the C64, you can trick
- it into removing the border allowing
- graphics to be placed there. By
- similar techniques, you can also alter
- the background colour each scan line
- on the C64 which just happens to be
- one of the most basic operations of
- the Amiga's Copper chip. Finally,
- both machines have pretty crap Basic
- languagues (well they do!) and both
- were originally marketed as business
- machines, denying their ability to
- produce high quality games (how many
- word processors need 8 multiplexed
- sprites?). They also have two of the
- best 8/16 bit sound chips availiable
- producing quality music and sound
- effects. So from all that, its not
- hard to see that the Amiga is
- basically a 16 bit Commodore 64 which
- can only be a good thing. The C64 has
- outlasted all the other 8 bit
- computers, from the Spectrum/Amstrad
- to the PC Engine, so basing the Amiga
- on such a winning design can only be a
- good thing. The Amiga is a great
- machine for the very same reason that
- the C64 is; because it's versatile.
- So there!
-
- - Sumaleth
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- @IPshipC