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Original URL : https://www.retrobrewcomputers.org/doku.php?id=boards:sbc:sbc-386ex:rev0 Snapshot date: 2022-09-29 Generator : wayback-archiver
*/
SBC-386EX prototype (rev 0) Board
This board is obsolete. It was strictly used to become familiar with the 386EX processor chip.
The prototype board SBC-386EX-0
This board take several short-cuts: SRAM instead of DRAM, limited peripherals. However, it is a test bed to learn …
Enabling the slot-15 I/O ports (all of the on-chip goodies); and disabling them, too.
Programming the I/O and memory chip selects. (critical)
Using 16-bit and 8-bit mixed ports.
Accessing & programming the serial I/O port 0 at 0x03F8.
Getting to the timers. Possible automatic determination of CPU clock speed.
Using a new access method to get to the DS1302. Three pins on one of the parallel ports should work.
Enabling & using the 387SX math co-processor.
Accessing peripherals on the ECB bus; i.e., other RetroBrew boards.
DRAM, synchronous serial I/O (SSIO), and DMA will have to wait for another prototype round.
Here's the board 98% built-up, lacking only FPU & RTC crystal:
