Epson manual MFJ-1278B MULTI-MODE Hardware, MFJ-1278B Specifications

MFJ-1278B MULTI-MODE HARDWARE

HARDWARE

This chapter details the specifications and the functional description of the MFJ-1278B hardware design.

MFJ-1278B SPECIFICATIONS

Processor

CMOS Z-80A

Clocks

Processor master clock input frequency: 4.9152 MHz

User Port Clock:

Switch selectable at 16x baud rate.

Memory

All memory in industry-standard JEDEC Byte-Wide sockets.

Standard complement of ROM: 1 Megabit (128K x 8) 1 x 27C101

Standard complement of system RAM: 32K 1 x 43256C-15L

Standard complement of mailbox RAM: 32K (expandable to 512K)1 x 43256C-15L

Serial Port

A Z8440 SIO/0 type device, port B configured as UART plus low- Portpower TTL-to- RS-232C signal level interface.

Baud rates supported: 300, 1200, 2400, 4800, 9600 and 19,200.

Standard female DB-25S (DCE) RS-232C connector. An 8-pin molex male connector for TTL serial port.

Modem

Demodulator: XR2211 PLL demodulator circuit plus related components to receive up to 1200 baud.

Modulator: XR2206 modulator circuit plus related components to produce tones for all modes of operation.

Built-in modem calibration system.