City #44 19 мая 2000

Железо

Iron - RS-232 Interface for SPECTRUM kompyuetrov.

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    RS-232 Interface for SPECTRUM computers


     (C) KOHASOFT'1991 * (C) UA3PRQ'1992
 User's amateur communication SOFT 'HARD WARE



 RS-232 interface is designed for sharing
information on the serial link between
computer and peripherals
supporting this protocol. Scheme
focused on application of a modified
terminal program "TERM.T91" -> "Term91v2" and
implements all the features of the universal
Transceiver KR580VV51A asynchronously
exchange. The program uses an internal coeff.
division of the port is equal to 16 and operable to
exchange rate to 60000 baud.

  Application of programmable timer KR580VI53 in
mode frequency divider allows you to select any
transfer rate from the full standard range of
inaccuracy +1% max. It is quite possible to use and
other program support using data
BIS. As the basis of the scheme used by the terminal
Radio-86RK.

  Interface uses the selection signals from the decoder
K555ID7 (Scheme buffer interface) in
according to:

  CHANNEL 3 -> CS-53-choice KR580VI53

  CHANNEL 5 -> CS-51-choice KR580VV51

  When programming BIS enough appeal to
incomplete port addresses, considering it allows
reach a maximum speed of native code in
However, the optimal construction program
maximizes for LSI VV51A
exchange rate on the ZX-SPECTRUM frequency
Clock Z80 - 3.5 mHz. Unused two DPKD
the timer can be used at your discretion
(Napremer for frequency modulation in a modem)
appropriate programming VI53. Addresses
Port Interface:

  # F7 (247); / # FFF7 / - Register of Exercise. words KR580VI53

  # D7 (215); / # FFD7 / - Counter 2

  # B7 (183); / # FFB7 / - Counter 1

  # 97 (151); / # FF97 / - counter 0

  # EF (239); / # FFEF / - Register of Exercise. words and words
Comp. KR580VV51

  # CF (207); / # FFCF / - details

  The interface provides an interface to devices
by RS-232 to TTL level signals. When
the need for full compliance with this
standard with bipolar +-12V signal interface
must be supplemented by the level converter
(Eg EI or m / c. Series K170). In most
cases, however, when distances between devices to
several meters is quite possible to work at TTL
level signals.


              to be continued ...