karn@mouton.UUCP (07/19/84)
TO ALL VANCOUVER BOARD USERS JULY 2, 1984 Recently, The Amateur Radio Research and Development Corporation (AMRAD), originators of the now popular AX.25 packet radio protocol, developed a retrofit board for the Vancouver Terminal Node Controller board, originally developed by Douglas Lockhart, VE7APU. Using the daughter board (part number VDS-1), systems designers are now freed from the memory constraints of the original board. This translates into better operation for the packet radio enthusiast. Some of the advantages of the AMRAD Vancouver Daughter board system are: * No modifications (jumpers or traces cut) required on the Vancouver board for normal operation * No jumper wires to hook between the two boards. All connections necessary are done via wire-wrap sockets. * From 8k (using 2716's) to 32k (using 2764's) of EPROM * From 8k (using 6116's) to 32k (using Intel xxxx's) of RAM * Software programmable baud rate generator (using Intel 8253) * Optional use of timed interrupts for better software control * Position for up to six 16-pin sockets for user kludging * Position for one 24-pin socket for user kludging * General kludge area of 1.1 by 1.7 tenth-inch spaced holes * Uses only two additional IC's (other than RAM and EPROM) * requires no additional power supplies (in fact the minus five volt supply needed for the 2708's can be eliminated) * Full documentation available. * Priced inexpensively at only $25.00 for the bare board. To order a VDS-1 board, send $25.00 plus $2.25 for shipping (US funds) to: Technetronics Systems Inc. ATTN: Charles O. Phillips 6134 Columbia Pike Falls Church, VA 22041