update errata for pcb rev.A and rev.A1

README.md

@@ -17,7 +17,7 @@ Sound card for ZX Spectrum (NemoBus).
 
 ### Changelog & current status
 * Rev.A - first release. Please note the [errata](pcb/rev.A/ERRATA.txt);
-* Rev.A1 - fixed all rev.A issues.
+* Rev.A1 - fixed known rev.A issues. Please note the [errata](pcb/rev.A1/ERRATA.txt).
 
 Sound card has been tested only with ZX Evolution. You can use it with another computer at your own risk.
 

pcb/rev.A/ERRATA.txt

@@ -1,3 +1,7 @@
 1. Missing MREQ signal. You should wire MREQ from edge connector to TP1
 2. R2, R33 - 10K
 3. R6, R12, R30, R31 - 47k
+
+UPD. 2023-08-21:
+4. R20 and R34 labels on silkscreen are misplaced
+5. Incorrect 3.5mm jack footprint - left-right signals are swapped

pcb/rev.A1/ERRATA.txt

@@ -0,0 +1,2 @@
+1. R20 and R34 lables on silkscreen are misplaced
+2. Incorrect 3.5mm jack footprint - left-right signals are swapped