We all know that works AMIGA
processor company MOTOROLA, but
what we know about those of specialized LSIs, which creates the
originality AMIGA! The following information will help you
to know them closer.
So here we go:
FAT AGNUS
FAT AGNUS (fatty Agnus), so named because it is a chip with
84-pin in a square housing. It controls 25 channels of data,
including disc surgery, and the sound, reducing the minimize
interference with the processor. In addition, it can quickly
transfer blocks of data in memory without the involvement of
the processor, which gives the ability to quickly generate the
image.
DENISE
The main function of this scheme is to generate a graphical
signal. Part of this work previously carried out a scheme AGNUS,
which takes the graphical
data and sends them to DENISE
in parallel code. DENISE converts this data into a serial image
signal. This also applies to graphics 'hell'. In addition,
properly defined priorities details of schedules, as well as
Priority of color. DENISE generates images with different
resolution - from 320 * 200 pixels and 640 * 400 pixels
has 4096 shades of colors and displays the text on the screen.
This chip performs another
function is not related to graphics
- Tracks the mouse movements and
joystick.
PAULA
PAULA - this is the second major
computer chips AMIGA. She
handles all operations related to the drives, serial
RS-232 port, and analog music vhodami.Krome addition, PAULA
controls all interrupts.
Sound features of a computer
provided by 4 independent
analog-digital converters that operate in the system
stereo. PAULA has 4 votes with
range 9 octaves each, using the amplitude and frequency
modulation. This allows you to imitate any sound - from the
noise of the car Ferrari, before the vote Sabriny.Krome
addition to the presence of a channel DMA.
GARRY
GARRY performs less noticeable
function - to control the data bus, organizes data for
central processor and control some functions of the drive.
CIA (8520)
IC CIA (Complex Interface Adapter) is called CIA-A and
CIA-B. They have 2 programmable 8-bit parallel
I / O ports, 2 16bitovomu meter time, bi-directional timer
interrupt is generated after resetting. Possible, for example,
call certain routines at regular intervals just 3 milliseconds.
With these chips, when
low clock frequency of the CPU (compared to IBM'ovskimi
hundreds of megahertz), AMIGA achieves a stunning performance!
The above data are valid for the AMIGA 500, as to more
sophisticated models AMIGA, in particular AMIGA 1200, used
somewhat different, more powerful BIS'y.
See you in the future releases!
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