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| boards:sbc:sbc-386ex:rev0 [2022/09/29 17:20] – Initial import from Wayback Machine | boards:sbc:sbc-386ex:rev0 [2026/06/15 12:00] (current) – external edit 127.0.0.1 | ||
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| + | /* Imported from Wayback Machine | ||
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| + | */ | ||
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| + | ====== SBC-386EX prototype (rev 0) Board ====== | ||
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| + | This board is obsolete. It was strictly used to become familiar with the 386EX processor chip. | ||
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| + | ==== The prototype board SBC-386EX-0 ==== | ||
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| + | [[https:// | ||
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| + | This board take several short-cuts: SRAM instead of DRAM, limited peripherals. However, it is a test bed to learn … | ||
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| + | Enabling the slot-15 I/O ports (all of the on-chip goodies); and disabling them, too. | ||
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| + | Programming the I/O and memory chip selects. (critical) | ||
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| + | Using 16-bit and 8-bit mixed ports. | ||
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| + | Accessing & programming the serial I/O port 0 at 0x03F8. | ||
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| + | Getting to the timers. Possible automatic determination of CPU clock speed. | ||
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| + | Using a new access method to get to the DS1302. Three pins on one of the parallel ports should work. | ||
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| + | Enabling & using the 387SX math co-processor. | ||
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| + | Accessing peripherals on the ECB bus; i.e., other RetroBrew boards. | ||
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| + | DRAM, synchronous serial I/O (SSIO), and DMA will have to wait for another prototype round. | ||
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| + | ---- | ||
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| + | Here's the board 98% built-up, lacking only FPU & RTC crystal: | ||
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| + | [[https:// | ||
