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==== Table of Contents ====

[[#changes_errata|Changes & Errata]]

[[#kontron_reset_modification|Kontron Reset modification]]

[[#version_003_changes|Version 003 changes]]

[[#version_002_information|Version 002 information]]

====== Changes & Errata ======

===== Kontron Reset modification =====

The current SCG design has the reset circuit hardwired for Legacy/N8VEM mode. To convert to Kontron mode apply the following changes:

Disconnect pin 8 of U12 from C31 of the ECB connector.

Connect pin 8 of U12 to C26 of the ECB connector.

The easiest way to do this is the cut the C31 wire on the ECB connector and then link C31 pad to C26 pad.

===== Version 003 changes =====

On version SCG-002 and prior, John Coffman identified that the I/O select circuit is qualified only by IORQ# (low). It should be further qualified by M1# (high). The board will erroneously select on an Interrupt Acknowledge (IORQ# low, M1# low). This has been correct in SCG-003.

To update version 002 board:

Cut track between pin 13 and pin 14 on IC U10.

Link pin A20 on ECB connector to pin 13 on IC U10.

If socket on IC U10 prevents cutting the track then lift pin 13 and link the pin to A20.

===== Version 002 information =====

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:scg:scg-002_board.pdf|Board: scg-002_board.pdf]]

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:scg:scg-002_schematic.pdf|Schematic: scg-002_schematic.pdf]]

Manufacturing Files: [[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:scg:sgc-002_gerbers.zip|:boards:ecb:scg:sgc-002_gerbers.zip]]

[[https://retrobrewcomputers.org/lib/exe/fetch.php?media=boards:ecb:scg:ecb_scg-002.zip|KiCAD Files: ecb_scg-002.zip]]

For information on prior board versions, see the [[n8vem-pbwiki-archive:0:35845334:48860720:33053543:index|Legacy Wiki SCG Folder]].