Gemfile

@@ -33,5 +33,3 @@ gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
 gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
 
 gem "jekyll-openmoji", "~> 0.1.6"
-
-gem "jekyll-figure", "~> 0.2.0"

Gemfile.lock

@@ -54,7 +54,6 @@ GEM
       webrick (~> 1.7)
     jekyll-feed (0.17.0)
       jekyll (>= 3.7, < 5.0)
-    jekyll-figure (0.2.0)
     jekyll-openmoji (0.1.6)
       html-pipeline (~> 2.14)
       html-pipeline-negarmoji (~> 0.1.6)
@@ -111,7 +110,6 @@ DEPENDENCIES
   http_parser.rb (~> 0.6.0)
   jekyll (~> 4.3.2)
   jekyll-feed (~> 0.12)
-  jekyll-figure (~> 0.2.0)
   jekyll-openmoji (~> 0.1.6)
   minima (~> 2.5)
   tzinfo (>= 1, < 3)

_config.yml

@@ -31,7 +31,6 @@ theme: minima
 plugins:
   - jekyll-feed
   - jekyll-openmoji
-  - jekyll-figure
 
 # Exclude from processing.
 # The following items will not be processed, by default.

_source/_plugins/overline.rb

@@ -1,15 +0,0 @@
-module Jekyll
-  class OverlineFilter
-    def self.apply_overline(content)
-      content.gsub(/~([^~]+)~/, '<span class="overline">\1</span>')
-    end
-  end
-
-  Hooks.register [:documents, :pages], :post_render do |item|
-    if item.output_ext == ".html"
-      item.output = OverlineFilter.apply_overline(item.output)
-    end
-  end
-end
-
-puts "✅ Overline plugin loaded!"

_source/_posts/2025-03-23-ti99-4a-restoration.md

@@ -1,93 +0,0 @@
----
-layout: post
-title: "Restoring the TI 99/4A"
-date: 2025-03-23 12:00:00 +0200
-comments: true
-categories:
----
-
-My father purchased that console in 1982. I was 5 at the time, and it was my very first contact with a computer.
-We used it for 5 years, till we got an Amstrad PC1512 in 1987.
-
-It has been non-working for a number of years, and today I'd like to bring it back to a working condition, if only to show my kids
-what the "computer experience" was like back in the twentieth century.
-
-## What do we have in our hands?
-
-The machine is a European (PAL) model (6 pin DIN component video output, which we used with a PHA2037 RVB modulator).
-
-Model PHC004A (silver console), serial R030174 / 44 83 RCI.
-
-When I opened it up, I first noticed that the VDP was missing! My father mentioned a former colleague opening up the machine at
-some point... So I started with getting a replacement 9929 from eBay.
-
-When connecting the machine to a TV and powering up, I get the typical black screen and continuous tone symptom, which is
-consistent with the failure mode I remember from years back when I had last tried to use it.
-
-## First tests
-
-### Visual inspection
-
-The motherboard shows no obvious sign of damage such as corrosion or swollen electrolytics caps.
-
-### Voltages
-
-* the voltages provided by the mains transformer look good
-* the DC voltages at the output of the power supply board look good
-
-### Clock signaks
-
-The four 12V clock signals at the TMS9900 look OKish. They are not super clean, with significant ringing in particular
-in the negative region, but the frequency and the phase relationships look right.
-
-The four TTL clock signals at the TMS9904 also look about right.
-
-{% figure caption:"12V clocks" %}
-![12V clocks](assets/TI-resto/DS1Z_QuickPrint3-12V-clocks.png)
-{% endfigure %}
-{% figure caption:"TTL clocks" %}
-![TTL clocks](assets/TI-resto/DS1Z_QuickPrint4-TTL-clocks.png)
-{% endfigure %}
-
-The VDP clocks look OK:
-{% figure caption:"VDP XTAL2" %}
-![TMS9929 XTAL2 (40)](assets/TI-resto/DS1Z_QuickPrint5-VDP-XTAL2.png)
-{% endfigure %}
-{% figure caption:"VDP XTAL1" %}
-![TMS9929 XTAL1 (39)](assets/TI-resto/DS1Z_QuickPrint6-VDP-XTAL1.png)
-{% endfigure %}
-
-_No CPUCLK on pin 38 as this is an EU console with a VDP9929 VDP: pin 38 is the R-Y video component._
-
-GROMCLK taken on pin 37 the VDP loops OK:
-{% figure caption:"VDP GROMCLK output" %}
-![TMS9929 GROMCLK (37)](assets/TI-resto/DS1Z_QuickPrint7-VDP-GROMCLK.png)
-{% endfigure %}
-
-### CPU signals
-
-* :thumbsup: ~RESET~ seems to be high as expected
-* :thumbsdown: A0 and A1 appear to be rippling at odd voltage levels somewhere between logic 0 and 1
-{% figure caption:"TMS9900 address bus A0" %}
-![TMS9900 A0](assets/TI-resto/DS1Z_QuickPrint9-CPU-A0.png)
-{% endfigure %}
-{% figure caption:"TMS9900 address bus A1" %}
-![TMS9900 A1](assets/TI-resto/DS1Z_QuickPrint10-CPU-A1.png)
-{% endfigure %}
-
-* :thumbsdown: ~MEMEN~ seems to be stuck high, I'd expect it to go down regularly as memory cycles are executed
-{% figure caption:"TMS9900 ~MEMEN~" %}
-![TMS9900 MEMEN](assets/TI-resto/DS1Z_QuickPrint11-CPU-MEMEN.png)
-{% endfigure %}
-
-## Conclusion of first tests
-
-At this stage of investigation, it looks like the CPU is not working as expected.
-
-From there I see three possible next steps:
-* I'm wondering if the clock signals might be too much out of spec to allow correct operation (in which case
-  I'd need to first sort these out)
-* Could a faulty cap in the CPU's vicinity account for the symptom?
-  * I'm disinclined to do a full recap in the dark without a positive indication that that's the problem -- visually the caps look
-    all right, and those from the power supply side appear to be in a good enough state that all voltages look right
-* ~MEMEN~ stuck high and A0/A1 at weird level (or high-Z) make me suspect a nonfunctional TMS9900

_source/assets/main.scss

@@ -1,14 +0,0 @@
----
-# Custom stylesheet
----
-
-@import "minima";
-
-.overline {
-    text-decoration: overline;
-}
-
-figcaption {
-    font-style: italic;
-}
-