Docs: minor tweaks & a docs landing page

[Gadgetoid]

No description provided.

[Daft-Freak]

Think you broke the 32BLIT_DIR variable.

[Daft-Freak]

Hmm, that sound TODO needs updated.

[Gadgetoid]

I had a big table of differences somewhere, too, where the heck did I put it!

[Gadgetoid]

Think you broke the 32BLIT_DIR variable.

Whoops

I did a naive find/replace...

[Gadgetoid]

Oh, here it is:

	32blit	PicoSystem
CPU	480MHz	250MHz †
RAM	611K §	151K to 207K (lores only ¶)
FPU	Yes	No
Buttons	6 + reset	4 + power
Joystick	Yes	No
Tilt	Yes	No
Sound	8CH mini speaker	1CH piezo booper ‡
Storage	32MB XiP QSPI + 128K Flash	12MB XiP QSPI
	SD card for data	4MB QSPI for data (FAT)
Screen	320x240 (160x120 lores)	240x240 (120x120 lores)
Firmware	Yes	No
Launcher	Browse + Launch Games	No

• † - technically 2 cores overclocked from 133MHz to 250MHz but the 32Blit SDK uses only one
• ‡ - makes a best-effort attempt to play any SQUARE waveforms (single-channel)
• § - 362K main RAM, 64K D3 RAM, 127K DTCMRAM, 58K ITCMRAM
• ¶ - setting ALLOW_HIRES=0 allocates a doubled buffered 120x120 16bit framebuffer (56.25k) and disables the hires screen mode.

[Gadgetoid]

Something like:

	32blit	PicoSystem	VGA Board + Pico
CPU	480MHz	250MHz †	250MHz †
RAM	611K §	151K to 207K (lores only ¶)	~207K
FPU	Yes	No	No
Buttons	6 + reset	4 + power	USB HID Gamepad
Joystick	Yes	No	No
Tilt	Yes	No	No
Sound	8CH mini speaker	1CH piezo booper ‡	8CH 3.5mm jack (i2s DAC)
Storage	32MB XiP QSPI + 128K Flash	12MB XiP QSPI	1.5MB XiP QSPI
	SD card for data	4MB QSPI for data (FAT)	512K QSPI for data (FAT)
Screen	320x240 (160x120 lores)	240x240 (120x120 lores)	160x120 only
Firmware	Yes	No	No
Launcher	Browse + Launch Games	No	No

• † - technically 2 cores overclocked from 133MHz to 250MHz but the 32Blit SDK uses only one
• ‡ - makes a best-effort attempt to play any SQUARE waveforms (single-channel)
• § - 362K main RAM, 64K D3 RAM, 127K DTCMRAM, 58K ITCMRAM
• ¶ - setting ALLOW_HIRES=0 allocates a doubled buffered 120x120 16bit framebuffer (56.25k) and disables the hires screen mode.

[Daft-Freak]

32blit RAM might be a bit high (think the firmware uses some of D3, ITCMRAM still isn't doing anything).

VGA board input/storage is currently over here: https://github.com/Daft-Freak/32blit-beta/commits/pico-all-the-boards. (Along with core1, some bugfixes and running on everything with a screen).

So uh, currently VGA board is buttons: no, storage: 1.5MiB/512k (assuming a regular pico), screen: 160x120 lores only.

[Gadgetoid]

I guess HDMI board will be exactly the same as VGA.

And I've just remembered where my microB to microB OTG cable is. (I think)

[Daft-Freak]

Hmm, think I saw a palette demo in PicoDVI...