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/* Imported from Wayback Machine
   Original URL : https://www.retrobrewcomputers.org/doku.php?id=boards:sbc:sbc_v2:sbc_v2-004:development
   Snapshot date: 2025-04-23
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====== SBC V2-004 Development ======

Updated design to include the following changes.

Correction of reset circuit.

Addition of speaker circuit.

Add solder jumpers for bypassing DS1210.

Move status LED to corner of board as per other ECB boards.

Align serial connector pinout and functionality to SBC Z180 Mark IV

Add max232 solder jumpers for TTL level output.

Add onboard super capacitor.

Incorporate ppide.

Update to Kicad 5.

Add jumper settings to silkscreen.

Move reset switch to edge of board and remove reset jumper.

Add jumpers to configure battery backup source.

Add cpu clock divider to support MSX.

Default to hard Kontron reset mode.

Add User input button on UART Ring Indicator line (for recovery mode in ROMWBW)

Other ideas to be considered:

RAM access over ECB-BUS.

Renumber all parts.

Most recent Kicad files can be found here: https://github.com/b1ackmai1er/SBC-V2-004

Version V:

{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=800&h=390&tok=20c639&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fboards%2Fsbc%2Fsbc_v2%2Fsbc_v2-004%2Fsbc-v2-004v-front.png?800x390}}

{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=800&h=390&tok=5e5aed&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fboards%2Fsbc%2Fsbc_v2%2Fsbc_v2-004%2Fsbc-v2-004v-back.png?800x390}}

Version: R:

{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=800&h=390&tok=72db49&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fboards%2Fsbc%2Fsbc_v2%2Fsbc_v2-004%2Fsbc-v2-004r.png?800x390}}

{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=800&h=600&tok=6e0dd5&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fboards%2Fsbc%2Fsbc_v2%2Fsbc_v2-004%2Fsbc-v2-004q.png?800x600}}

Sound circuit sourced from TRS-80 circuit:

[[https://retrobrewcomputers.org/lib/exe/fetch.php?tok=483ee5&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/boards/sbc/sbc_v2/sbc_v2-004/sbc_v2-004-snd.png|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=386&h=300&tok=2e6263&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fboards%2Fsbc%2Fsbc_v2%2Fsbc_v2-004%2Fsbc_v2-004-snd.png?386x300}}]]

CPU-Clock switching sourced from ZX-TURBO circuit:

{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=703&h=390&tok=8bd417&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fboards%2Fsbc%2Fsbc_v2%2Fsbc_v2-004%2Fzxturbo-v2.gif?703x390}}