YAPC - Features

Here is now a list of desirable features:

VGA output

Fixed size framebuffer (less than 64 kb or even down to 32000 bytes)
12 bits RGB output, scanvideo compatible (even the Atari STe and the Amiga had these 4096 colors palette!)
From monochrome to up to 256 colors indexed using palettes
From 640x400 up to 1280x1024 based VGA modes
Hardware sprites / layers? With different palette(s)?
Ability to switch from 1/2/4/8 bpp in the same VGA base mode without reboot
May need a reboot to change VGA base mode
Text mode overlay with fixed width font
Settings stored on RTC NVRAM (or SD card?) to be applied on next boot

Sound

Stereo output, so a least 2 channels (left and right)
4 channels, 2 to the left and 2 to the right like an Amiga?
16 bits @ 44100 Hz, 8 bits @ 22050 or 8 bits @ 11025 Hz?
Should be able to play 4 channels original soundtracker MODs with reasonable quality (see https://github.com/moefh/pico-mod-player and https://modarchive.org/index.php?request=view_profile&query=90994)

Real Time Clock (RTC) with battery

DS1307 or better (DS3231?) based
Use of 56 bytes NVRAM for settings

USB

Keyboard (1 max), layout (DE/FR/US at least) saved in NVRAM
Mouse (optional, 1 max)
Digital joysticks / gamepads (1 at least, up to 4?)
May be limited to 4 “full speed” ports

SD Card

FAT32
Up to 32 Mb (is more a good idea?)

Serial

One serial port should be available

Networking (optional)

Either solution should support file transfers:

Wi-Fi
- Settings on SD card (SSID & al., DHCP only?) as they won’t fit easily in 56 bytes of NVRAM
- API for HTTP calls only (methods: GET / POST / PUT / DELETE and so on)
Ethernet
- W5100S based like https://www.elektor.fr/wiznet-ethernet-hat-for-raspberry-pi-pico?
- IPv4 only
- Settings on SD card (static IP or DHCP) as they won’t fit easily in 56 bytes of NVRAM