NEC nd-20292 manual Tzx, 910.2 PC-8300 Personal Computer

ND-20292

CHAPTER9

APRIL, 1990

The CPM-DOS disk contains the Disk Operating

System and the m Host Program which is listed as file named ADMI.DO.

The MS-DOS@ disk does not contain a disk operating system; it does contain a Communication Application Program and the BAA Host Program, both listed in a file named COMLINK.

910.2PC-8300 PERSONAL COMPUTER

The PC-8300 is an NEC portable laptop personal computer containing 128K ROM and 64K RAM. It uses an 8085 microprocessor and CMOS components for low power consumption. It comes equipped with an RS232C serial I/O port and a Centronics parallel printer port. When connected to the RAA-E via modems, the PC-8300 can be used to program the system from a remote location. ( See Figure 910-l.)

A PC-8201A (expanded to 64K RAM), IBM PC XT, IBM AT, NEC APCIV, NEC Powermate, Datavue’s Sparks Laptop, NEC Multispeed or NEC Prospeed, may be used instead of the PC-8300.

910.3PC-8231A MICRO FLOPPY DISK DRIVE The PC8231A is an NEC micro floppy disk drive unit designed to work with NEC’s PC-8300 and PC8201A computers. This disk drive unit uses a single, 3.5 inch single sided, double density, 320K diskette. It is not required when using the IBM compatible computers.

910.4PC-8295A-01 RS-232C CABLE - NORMAL The NEC PC-8295A-01 cables are standard RS-232C jack-to-jack (male to male) cables used to connect the computer and RAA-E Units to modems. This cable

uses pins 1 through 820, and 22.

910.5PC-8295A-02 RS-232C CABLE REVERSED

The PC-8295A-02 cable is an RS-232C jack-to-jack (male to male) cable which has several wiring reversals as compared to a standard RS-232C cable. This cable is sometimes called a null modem cable. The following leads which are used with the RAA-E are reversed within the cable: 2 and 3; 4,and 5; and 6 and 20. Pins 1 and 7 are not reversed. This cable is used when the RAA-E unit is connected directly to the computer (without a modem). This arrangement can be used to test the RAA-E Unit with the computer or to familiarize oneself with the operation of the computer in conjunction with the RAA-E.

910.6MODEMS

Two modems are required for programming via the Remote Administration Adaptor. The first modem is connected to the RAA-E Unit located at the job site where the system being programmed is located. The second modem is connected to the computer located at the distant location, from which the actual data entry is being made. (See Figure 910-l).

The modems must be locally provided. They must be asynchronous type modems capable of transmitting/ receiving data at 300, 600, 1200 or 2400 baud. Both modems and the RAA must be set at the same baud rate.

The RAA-E Unit uses 8 bit ASCII Protocol with 2 start/stop bits and no parity.

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Figure 910-l RAA-E Block Diagram Hook Up & Signal Flow

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