Merge pull request #2978 from jepler/runcpm-metro-rp2350

Port RunCPM to the Metro RP2350 with HSTX

Author: BlitzCityDIY

runcpm-rp2350-hstx-usb/runcpm-pico/.metro_rp2350_tinyusb.test.only

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+MIT License
+
+Copyright (c) 2017 Mockba the Borg
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

runcpm-rp2350-hstx-usb/runcpm-pico/LICENSE

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+<!--
+SPDX-FileCopyrightText: 2023 Jeff Epler for Adafruit Industries
+
+SPDX-License-Identifier: MIT
+-->
+
+This is a port of runcpm to the raspberry pi pico.
+
+It is based on:
+ * [RunCPM](https://github.com/MockbaTheBorg/RunCPM/)
+ * [RunCPM_RPi_Pico](https://github.com/guidol70/RunCPM_RPi_Pico)
+
+It works on a Raspberry Pi Pico (or Pico W). It uses the internal flash
+for storage, and can be mounted as USB storage.
+
+If your Pico is placed on the Pico DV carrier board, you also get a 100x30
+character screen to enjoy your CP/M output on!
+
+First, build for your device. You must
+ * Use the Philhower Pico Core
+ * In the Tools menu, select
+   * A flash size option that includes at least 512kB for filesystem
+   * USB Stack: Adafruit TinyUSB
+
+After it boots the first time, you need to
+ * Format the flash device on your host computer
+ * Create the folder "<DEVICE>/A/0"
+ * Put something useful in that folder, such as [Zork](http://www.retroarchive.org/cpm/games/zork123_80.zip)
+   * Files must respect the "8.3" naming convention (8 letters filename + 3 letters extension) and be all uppercase
+ * Safely eject the drive, then reset the emulator.
+ * Now at the "A0>" prompt you can run "ZORK1".