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--- boards:ecb:protoboard_iii:errata [2025/02/12 20:03] – Revision from 2025-02-12
+++ boards:ecb:protoboard_iii:errata [2026/06/15 12:50] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+/* Imported from Wayback Machine
+   Original URL : https://retrobrewcomputers.org/doku.php?id=boards:ecb:protoboard_iii:errata
+   Snapshot date: 2025-11-17
+   Generator    : wayback-archiver
+*/
+====== Errata ======
+//Version 1606//
+This board fixes the I/O select problem on former boards, which did not qualify /IORQ with /M1 high. This extra qualification prevents the board from selecting on an INTA (Interrupt Acknowledge) cycle.
+There was/is a Kicad issue where signals exiting a global bus did not connect to traces of the same name on the same sheet.
+The schematic is correct but A7..A2 leaving the bus are not connected to A7..A2 on K1..K6.
+The following changes are required - six link wires need to be added.
+A7: connect U5.2 to U2.3
+A6: connect U5.4 to U2.5
+A5: connect U5.6 to U2.7
+A4: connect U5.8 to U2.9
+A3: connect U5.11 to U2.12
+A2: connect U5.13 to U2.14
+This is is corrected in the 171005 version.