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This page describes the Rev 1 of Tiny68K. Please follow this link to Rev 2 of Tiny68K
Tiny68K is a high-performance yet low-cost single board computer based on the Motorola 68000. Tiny68K has two unusual features:
Figure below shows an assembled Tiny68K.
Low cost without sacrificing performance is the design goall of Tiny68K. Cost control is achieved by:
Good performance is maintained by:
Rev 1 schematic
Rev 1 Gerber files
Tiny68K Monitor debugger. The software is developed in the EASy68K tool chain. Programming binary for serial EEPROM programmer (CH341).
Altera EPM7128 design files Designs are created in Quartus 8.1, should be compatible with later version of Quartus. Designs are entirely in schematics. Schematic in PDF format. Programming binary in .pof format.
CP/M-68K BIOS for Tiny68K
CP/M-68K CPM v1.3
CP/M-68K v1.3 distribution disk image for Tiny68K RAMdrive
RS232 adapter board to interface to the DB9 serial connector of a PC. The RS232 adapter is not needed for most USB-to-serial adapters which have TTL level I/O.
Build procedure for Tiny68K Kit #1 (building from scratch)
Build procedure of partially assembled board for Kit #2
Build procedure for Tiny68K Kit #2 (SMT capacitors and resistors already assembled, EPM7128 assembled and programmed).
Photo below is an annotated assembled board
A PC with terminal program such as Hyperterminal is needed to interface with Tiny68K. An USB-to-serial adapter with TTL level input/output can connect directly to Tiny68K's console connector. For USB-to-serial adapter with RS232 I/O, an adapter board is needed.
Apply 5V to the board via the 2.5mm power jack, the center is 5V, barrel is ground. The nominal power consumption at 8MHz system clock is 500mA. When powered is applied, the 7-segment LED will display '8' for a second and then '6'. While waiting for console command, the outer segments of the 7-segment display will flash for 1/2 second, one segment at a time, in a circular sequence. If the display indicate a static '4', it is waiting for hardware handshake signal to assert. Be sure the terminal program has RTS/CTS hardware handshake enabled.
Procedure for creating a new CF disk
Certain brands of CF disks may not work on some Tiny68K rev 1 board. This is a write up about this problem and possible solutions.