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--- boards:sbc:sbc_v2:sbc_v2-004:development [2025/04/23 07:35] – Revision from 2025-04-23
+++ boards:sbc:sbc_v2:sbc_v2-004:development [2026/06/15 12:34] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+/* Imported from Wayback Machine
+   Original URL : https://www.retrobrewcomputers.org/doku.php?id=boards%3Asbc%3Asbc_v2%3Asbc_v2-004%3Adevelopment
+   Snapshot date: 2022-06-13
+   Generator    : wayback-archiver
+*/
+====== 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:
+{{[[lib:plugins:ckgedit:fckeditor:userfiles:image:boards:sbc:sbc_v2:sbc_v2-004:sbc-v2-004v-front.png]]
+{{[[lib:plugins:ckgedit:fckeditor:userfiles:image:boards:sbc:sbc_v2:sbc_v2-004:sbc-v2-004v-back.png]]
+Version: R:
+{{[[lib:plugins:ckgedit:fckeditor:userfiles:image:boards:sbc:sbc_v2:sbc_v2-004:sbc-v2-004r.png]]
+{{[[lib:plugins:ckgedit:fckeditor:userfiles:image:boards:sbc:sbc_v2:sbc_v2-004:sbc-v2-004q.png]]
+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/plugins/ckgedit/fckeditor/userfiles/image/boards/sbc/sbc_v2/sbc_v2-004/sbc_v2-004-snd.png?386x300}}]]
+CPU-Clock switching sourced from ZX-TURBO circuit:
+{{[[lib:plugins:ckgedit:fckeditor:userfiles:image:boards:sbc:sbc_v2:sbc_v2-004:zxturbo-v2.gif]]