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boards:ecb:2s1p:start [2020/01/12 11:05] rcini [Errata] |
boards:ecb:2s1p:start [2024/02/10 22:40] (current) rcini [Resources] |
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- | ====== 2S1P - Dual Serial/ | + | {{https:// |
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- | The ECB 2S1P (or SPP for short) board provides two RS-232 level serial interfaces and a single PC/ | + | |
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- | {{https:// | + | |
===== Overview ===== | ===== Overview ===== | ||
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The board was developed primarily for and tested for use with the SBC-188 80C188-based processor board, but it should work with other boards. The SBC-188 BIOS has been modified to enable MS-DOS to use this board as standard COM/LPT ports (albeit at non-standard port addresses). | The board was developed primarily for and tested for use with the SBC-188 80C188-based processor board, but it should work with other boards. The SBC-188 BIOS has been modified to enable MS-DOS to use this board as standard COM/LPT ports (albeit at non-standard port addresses). | ||
- | As a point of note, the board is NOT compatible with the ST | + | As a point of note, the board is NOT compatible with the ST16C552 due to a different pin arrangement. |
- | ===== Errata | + | ===== Construction Notes ===== |
- | None in version 1.0-001 (the first production run). | + | ==== Resistor Arrays ==== |
- | ===== Resources ===== | + | The resistor arrays (RN501, RN502) that are part of the RC damper circuit for the parallel port are __isolated__ resistors, not the more common bussed resistor arrays that most builders have in stock. They are also an uncommon value (27 ohms) for your typical RetroBrew build. The schematic shows this difference, but if you go straight by the BOM, that difference isn't clear. |
- | ^Filename^Size^Updated| | + | ==== Jumpers ==== |
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- | \\ | + | AT/EPP: this jumper controls the parallel port mode supported by the 16C552. For use with DOS, I leave it in the most-compatible AT mode. |
+ | DCE/DTE: these jumpers (one for each port) controls whether the port acts as a terminal (DTE) or a modem (DCE); effectively a chip-controlled null-modem switch. | ||
- | ===== Overview ===== | + | RTS/DTR: these jumpers select which handshaking signal appears at the TTL-level 6-pin header. |
- | The ECB 2S1P board provides two 8250/16C550 similar serial interfaces (which is clocked at 1.8432mhz | + | INT/NMI: these jumpers control |
- | The board was developed primarily for and tested for use with the SBC-188 | + | BRD_SEL: this jumper controls which ECB port range the board is assigned to. For the SBC-188, |
- | + | ||
- | As a point of note, the board is NOT compatible with the ST16C552 due to a different pin arrangement. | + | |
===== Errata ===== | ===== Errata ===== | ||
- | None in version | + | Version |
+ | ===== Software ===== | ||
+ | |||
+ | The UAR/T used is a derivative of the Intel 8251 UAR/T so most basic code will run without significant modification. To use with MS-DOS on the SBC-188, TSR (terminate and stay resident) drivers are required to provide replacement BIOS functions (none of the BIOSes, including the latest BIOS-050, do not have any code to support the board). Additionally, | ||
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+ | The software should be considered " | ||
===== Resources ===== | ===== Resources ===== | ||
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+ | ===== Software ===== | ||
+ | |||
+ | The UAR/T used is a derivative of the Intel 8251 UAR/T so most basic code will run without significant modification. To use with MS-DOS on the SBC-188, TSR (terminate and stay resident) drivers are required to provide replacement BIOS functions (none of the BIOSes, including the latest BIOS-050, do not have any code to support the board). Additionally, | ||
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+ | The software should be considered " | ||
+ | |||
+ | ===== Resources ===== | ||
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+ | ^Filename^Size^Updated| | ||
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