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==== Table of Contents ====

[[#s1p_-_dual_serial_single_epp_parallel_interface|2S1P - Dual Serial/Single EPP Parallel Interface]]

[[#overview|Overview]]

[[#errata|Errata]]

[[#resources|Resources]]

====== 2S1P - Dual Serial/Single EPP Parallel Interface ======

The ECB 2S1P (or SPP for short) board provides two RS-232 level serial interfaces and a single PC/AT-compatible Centronics parallel port using the Texas Instruments TL16C552 multiport interface chip.

{{https://retrobrewcomputers.org/lib/exe/fetch.php?w=800&h=484&tok=873ff1&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fboards%2Fecb%2F2s1p%2Fecb_2s1p_001.png?800x484|ECB 2S1P Board Plot}}

===== Overview =====

The ECB 2S1P board provides two 8250/16C550 similar serial interfaces (which is clocked at 1.8432mhz to provide common baud rates from 300 to 115,200) and a single PC/AT-EPP compatible parallel printer port using the TL16C552B PLCC chip and related level shifters. Two TTL-level headers are provoded for those wanting to use USB TTL interfaces directly.

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.

===== Errata =====

None. The first production run was submitted for manufacturing and is expected in a few weeks.

===== Resources =====

^Filename                                                                                                                    ^Size ^Updated   ^
|[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:2s1p:ecb_2s1p-1.0-001_sch.pdf|ECB 2S1P-1.0-001_sch.pdf]]|724Kb|2019-12-27|
|[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:2s1p:ecb_2s1p-1.0-001_pcb.pdf|ECB 2S1P-1.0-001_pcb.pdf]]|500Kb|2019-12-27|
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