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--- builderpages:plasmo:zrc:zrc_rev1_1ec [2024/04/14 07:36] – Revision from 2024-04-14
+++ builderpages:plasmo:zrc:zrc_rev1_1ec [2026/06/15 13:17] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+/* Imported from Wayback Machine
+   Original URL : https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:zrc:zrc_rev1_1ec
+   Snapshot date: 2025-12-16
+   Generator    : wayback-archiver
+*/
+====== ZRC Rev1.1 Engineering Changes ======
+===== Introduction =====
+Hardware handshake is required for xmodem file transfer for ZRC. Two engineering changes are needed to enable hardware handshake.
+==== RTS from ZRC to serial port ====
+The RTS function is implemented in CPLD, but a physical connection is required from CPLD's internal logic to a pin on the serial port header. A wire should be added from pin 1 of the serial header (pin 1 is a square pad) to test point T10
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=08531d&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fzrc%2Fdsc_58740721.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/zrc/dsc_58740721.jpg?400x153|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_zrc_dsc_58740721.jpg}}]]
+==== CTS from USB-serial adapter to serial port ====
+A corresponding connection is needed on the USB-serial adapter to connect RTS to CTS. The existing pin 1 is connect to DTR which needs to be cut and a short wire connects pin 1 to CTS.
+[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=e8bfaa&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fzrc%2Fmodification_to_6-pin_cp2102_to_enable_cts_handshake.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/zrc/modification_to_6-pin_cp2102_to_enable_cts_handshake.jpg?400x264|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_zrc_modification_to_6-pin_cp2102_to_enable_cts_handshake.jpg}}]]