--- a/content/hp3562a_4.rst	Thu Nov 10 16:46:54 2022 +0100
+++ b/content/hp3562a_4.rst	Thu Nov 10 17:26:20 2022 +0100
@@ -22,6 +22,7 @@
 dedicated display controller (which is on the A38 memory board):
 
 .. image:: {static}/images/hp3562a/a8_a17_display.png
+   :alt: Block diagrams of the HP1345A A8 and A17 boards
 
 The unit is a 6 inch monochrome display producing true vector graphics
 with a resolution of 2048x2018 points. It can display up to 3226
@@ -31,6 +32,7 @@
 on the screen (it's not a pixel based display).
 
 .. image:: {static}/images/hp3562a/hp1345a_raster_vector.png
+   :alt: Picture of the raster vs. vector display principle
 
 It can diplay:
 
@@ -51,20 +53,26 @@
 Allowing more brightness control of the vectors.
 
 .. image:: {static}/images/hp3562a/hp1345a.jpg
+   :alt: Picture of the HP1345A vector display module
 
 
 If not connected with a controller, it shows a test pattern for
 adjustments.
 
 .. image:: {static}/images/hp3562a/hp1345a_test_pattern.png
+   :alt: Picture of the HP1345A test pattern
 
 The unit looks like:
 
 .. image:: {static}/images/hp3562a/hp1345a_side.jpg
+   :alt: Picture of the HP1345A vector display module (side view)
 
 .. image:: {static}/images/hp3562a/hp1345a_side2.jpg
+   :alt: Picture of the HP1345A vector display module (side view)
+
 
 .. image:: {static}/images/hp3562a/hp1345a_top.jpg
+   :alt: Picture of the HP1345A vector display module (top view)
 
 
 Adjustment and repair
@@ -89,6 +97,7 @@
 to desolder (at least one end): A1C45 and A1C48.
 
 .. image:: {static}/images/hp3562a/hp1345a_dead_caps.jpg
+   :alt: Picture of the 2 shorted tantalum capacitors
 
 
 These 2 small (tantalum) caps near U3 were short. Not sure why they
@@ -111,13 +120,18 @@
 -----------------
 
 .. image:: {static}/images/hp3562a/hp1345a_block_diagram.png
+   :alt: General block diagram of the HP1345A display unit
 
 .. image:: {static}/images/hp3562a/hp1345a_stroke_generator.png
+   :alt: Block diagram of stroke generator of the HP1345A display unit
 
 
 .. image:: {static}/images/hp3562a/hp1345a_ramp_generator.png
+   :alt: Block diagram of the ramp generator of the HP1345A display unit
 
 
 .. image:: {static}/images/hp3562a/hp1345a_vector_processor.png
+   :alt: Block diagram of the vector processor of the HP1345A display unit
 
 .. image:: {static}/images/hp3562a/hp1345a_vpc_architecture.png
+   :alt: Block diagram of the VPC architecture of the HP1345A display unit