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#  $Id: README,v 1.2 2001-09-27 12:00:02 chris Exp $

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Description: efi68k

============

CPU: MC68HC000 @16MHz

RAM: 256k

ROM: 256k

   Based upon a 16MHz 68HC000, efi332 is a minimally configured 4x6

inch single board computer. It includes the following major

components: (a) 256k SRAM (km681000l), (b) 256 EPROM (27C010),

(c) DP8570A (clock/timer/calendar), (d) MAX791 (cpu supervisory chip

with battery backup switch-over and watch dog timer), and

(e) NS16550DN (UART). The following interrupt functions have also been

incorporated: UART, TIMER, Watch Dog, and Low Line voltage (trips at

4.85V; enough time to save the cpu reg before reset is asserted on

power down).

   The schematic for efi68k is freely available via e-mail. Send

"index diy_efi" to majordomo@coulomb.eng.ohio-state.edu. Retrieve the

files related to 68hc000-1.00 with the "get diy_efi "

command. efi68k does not have an available printed circuit board, but

can be wire-wrapped in about four days. Cost is about $100US.

TODO:

=====

- add the "tm27 vector" ... can we use a trap instruction?

- generate include/coverhd.c to perform the tmtest.

- the interrupt drive I/O should be integrated into the RTEMS.

- finish the ROM memory model.

- add separate interrupt stack (low priority).

                                       John S Gwynne

                                          Gwynne.1@osu.edu

_______________________________________________________________________________

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    ElectroScience Laboratory, 1320 Kinnear Road, Columbus, Ohio 43212, USA

                Telephone: (614) 292-7981 * Fax: (614) 292-7297

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