The SB180FX is an "upward compatible performance extension" to the SB180. It is hardware and
software compatible with the SB180. It adds on-board SCSI, parallel I/O (Intel 8255), 256k
more memory, and provisions for external memory expansion (up to 4M bytes). It did not appear
in a Circuit Cellar article, but was mentioned in the "What's New" column in the December 1986
issue of BYTE Magazine.
The SB180FX has the following features:
* up to 512k-byte 150nsec DRAM, with one hardware wait-state inserted for DRAM access.
This was typically divided into a 64k TPA for CP/M - Z-system, and a 448k RAM disk.
* up to 4M-byte DRAM, using add-on FX-2MME memory expansion boards.
* SCSI bus interface, 50 pin connector.
* 24 bits of bidirectional parallel I/O ports, using an Intel 8255.
* 8k EPROM, with boot code and monitor. Designed to handle 16k and 32k EPROMs also.
* two RS-232 serial ports, 300 to 19200 baud. One is the console (terminal) port, the other
could be used for a modem, etc.
* floppy disk controller, single/double density, which could handle up to four drives (3.5, 5.25,
or 8 inch, in any combination).
* Centronics parallel printer port.
* requires only +5 and +12 VDC. The +12 VDC was used only for the serial port drivers. An onboard
DC inverter provided -12 VDC for the serial port drivers.
* board size is 5.75" by 8" inches.
Click on picture for a larger image.