From d5096607d4d6a4fde229bc9b45d2f6275815cbf1 Mon Sep 17 00:00:00 2001
From: psionrevo <psionrevo@noreply.localhost>
Date: Sun, 25 Jan 2026 22:55:25 +0000
Subject: [PATCH] Update README.md

---
 README.md | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/README.md b/README.md
index 2264424..df6fa81 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,26 @@
 # psion_pccard_network
 
+### PC Card Adapter Flow
+
+Psion --> rs232 --> max3243cai --> ttl --> Siemens CAB C165 LF --> PCMCIA
+
+### Notes
+* The C165 does not have hardware flow control pins (just rx/tx) so must bit-bang the flow control.
+* The cable has 10 pins and is socketed - looks like molex
+* Cable wires:
+  * Black (sheathed)
+  * Blue
+  * Brown
+  * Red
+  * White
+  * Yellow
+  * Black
+  * Green
+  * Orange
+  * Red/White
+* Looks like there are 2 extra wires in the cable that aren't used and cut down.
+
+### ToDo
+* Identify wires
+  * First will just continuity test against the max3243
+  * https://hackaday.io/project/161291-the-last-psion/log/157679-striving-for-simplicity-a-psion-serial-honda-to-usb-cable
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