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20150710 - Inspiration Reboot
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Quite inspired by the insane one still or video per day at beeple.tumblr.com.
+Attempting to get back in the grove of consistently taking a small amount of non-work time every day to reboot fun projects.
+I'm on week 2 now of probably a three month process of healing from a torn lower back,
+sitting in front of a computer is now low enough pain to have fun again...
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1536
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+Setting a new 1536-byte (3x 512-byte sector) constraint for a bootloader + source interpreter
+which brings up a PC in 64-bit long-mode with a nice 8x8 pix VGA font
+and with 30720-bytes (60 sectors, to fill out one track) of source text for editor and USB driver.
+USB providing thumb drive access to load in more stuff.
+Have 1st sector bringing up VGA and long mode,
+2nd sector with 64-character font,
+and last 512-byte sector currently in progress as the interpreter.
+Went full circle back to something slow, but dead simple:
+interpreter works on bytes as input.
+The following selection of characters appends simultaneously to a 60-bit 10 6-bit/char word string,
+and a 64-bit number,
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0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ#$@!+*-^&|=?<>_
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+Then giving a "color forth tag" like meaning to another fixed set of characters,
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~ - Negate the 64-bit number.
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. - Lookup word in dictionary, and push 64-bit value onto data stack.
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, - Push 64-bit number on data stack.
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: - Lookup word in dictionary, pop 64-bit value from data stack to word.
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; - Write 32-bit number at compile position.
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" - Lookup word in dictionary, interpret the string at address stored in word.
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[ - Lookup word in dictionary, store compile position in word, append string from [ to ] compile position.
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] - When un-matched with ], this ends interpretation via RET.
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\ - Ignore text until the next \.
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` - Lookup word in dictionary, call to address stored in word.
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+Those set of characters replace the "space" character in forth, and work like a post-fix tag working on either the string or number just parsed from input.
+The set of tags is minimal but flexible enough to build up a forth style macro language assembler,
+with everything defined in the source itself.
+More on this next time.
+One nice side effect of post-fix tags is that syntax highlight is trivial by reading characters backwards starting at the end of the block.
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+
Sony Wega CRT HDTVs
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+The old Wega CRT HDTVs work quite well.
+They apparently are nearly fixed frequency 1080 interlaced with around 540 lines (or fields) per ~60 Hz frame,
+and unlike prior NTSC CRT TVs, they seem to not do any real progressive scanning.
+Taking a working 1080i modeline and converting it to 540p and driving the CRT
+results in the Wega initiating a "mode-reset" when it doesn't see the interlaced fields for the 2nd frame.
+However 480p modes do work (perhaps with an internal conversion to 1080i).
+Given that 1080i modes are totally useless as the 60Hz interlace flicker is horrible,
+and 540p won't work, these HDTVs should be complete garbage.
+However 720p works awesome as the TV's processing to re-sample to 1080i does not flicker any worse than 60Hz already does.
+In theory the even and odd fields (in alternating frames) share around 75% of an input line (540/720),
+and likely more if the re-sampling has some low-pass filtering.
+Drop in a PS4 game which has aliasing problems, and the CRT HDTV works like magic.
+These late model "hi-scan" Wega CRTs only had roughly 853 pixel width aperture grille:
+853x540 from what was a 1920x1080 render is a good amount of super-sampling...
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