of an interval tinier or a real time clock.
5.4 Floppy Disk Formatter/Controller
It is a programmable floppy disk formatter/controller that interfaces a
floppy disk drive directly to a computer interface bus, and provides
soft sector formatting.
5 . 5 C R T Controller (CRTC) -
The CRTC of TPC-2000 is SY6545, it is the heart of video display
control. That has alphanumeric and limited graphics capabilities, fully
programmable
columns, blanking, etc.) fully programmable
cursor and capable of addressing up to 16K character refresh
5.6 Serial Keyboard Encoder
The
keyboard encoder, an
silicon gate technology device,
is designed to be a minimum
solution for the purpose of interfacing
detached keyboards to terminals. It can reduce the usual 18 to 24-wire
keyboard to terminal interconnection to a
The 96-key operation is a simple direct interface to 12 X 8 m a t r i x
keyboard. The additional capability of a
option can be obtained
by i m p l e m e n t i n g an inexpensive 4 to 12-line decoder
between the
and a 12 X 12 matrix keyboard. If fewer than 96 or 144 keys are
used, no connection is required in the m a t r i x at the unused key
locations.
1
18
