RunCPM for the Raspberry Pico and PicoW
Is using much of the RunCPM-Code for a Arduino-DUE (also HostOS 0x01 from the .ino)
does need
- SDCard interface with SPI
SD card attached to SPI bus as follows:
// Arduino-pico core
MISO - Pin 21 - GPIO 16
MOSI - Pin 25 - GPIO 19
CS - Pin 22 - GPIO 17
SCK - Pin 24 - GPIO 18
- RP2040 Hardware-/Board Support https://github.com/earlephilhower/arduino-pico
RunCPM for Pico can be compiled in the Arduino-IDE up to 250Mhz
[EDIT] via Ardino-IDE-Tweaks the Pico can run up to 270Mhz
and the PicoW up to 260Mhz
With 275Mhz or 300Mhz RunCPM does not start up.
34.78% speedup when you compile with -O3 option (at 250Mhz)
around 6.4 times faster - 25.6Mhz -
than a Z80 with 4Mhz (Philips P2500 Z80@4MHz) :
Infotext about the possible drives and user-areas from the original project-page https://github.com/MockbaTheBorg/RunCPM
RunCPM emulates the CP/M disks and user areas by means of subfolders under the RunCPM executable location, to prepare a folder or SD card for running RunCPM use the following procedures: Create subfolders under where the RunCPM executable is located and name them "A", "B", "C" and so on, for each disk drive you intend to use, each one of these folders will be one disk drive, and under folder "A" create a subfolder named "0". This is the user area 0 of disk A:, extract the contents of A.ZIP package into this "0" subfolder. Switching to another user area inside CP/M will automatically create the respective user area subfolders, "1", "2", "3" ... as they are selected. Subfolders for the user areas 10 to 15 are created as letters "A" to "F".
All the letters for folders/subfolders and file names should be kept in uppercase, to avoid any issues of case-sensitive filesystems compatibility. CP/M only supported 16 disk drives: A: to P:, so creating other letters above P won't work, same goes for user areas above 15 (F).
and not the (maybe) installed original SdFat-Library from Greiman:
Replace #include <SdFat.h> with include <ESP8266SdFat.h> in your .ino
and create the ESP8266SdFat.h in the following path
C:\Users\[yourUser]\AppData\Local\Arduino15\packages\rp2040\hardware\rp2040\2.5.2\libraries\ESP8266SdFat\src
with the content
#include "SdFat.h"
In
C:\Users\[user]\AppData\Local\Arduino15\packages\rp2040\hardware\rp2040\2.5.4\platform.txt
add in the top of the file where the compiler-warning-flags-lines are
compiler.cpp_warning_flags=-Wno-register -Werror=return-type
and change the compiler.cpp.flags line to
compiler.cpp.flags=-c {compiler.cpp_warning_flags} {compiler.defines} {compiler.flags} -MMD {compiler.includes} {build.flags.rtti} -std=gnu++17 -g -pipe
In
C:\Users\guido\Documents\Arduino\libraries\SdFat\src\SDFat.h
(to find the file replace guido with your username )
comment out the warning (because we use File32 instead)
https://forum.classic-computing.de/forum/index.php?thread/25805-runcpm-auf-dem-raspberry-pi-pico
If you got problems with the init of the SD-Card
then you could try to add duplicate Power (3.3v green) and GND (blue) cables
or an additional cable connection to the GND near the SPI pins (black)
Please connect your SDCard Reader/Writer (if it has a 5v->3.3 StepDown-Converter) to 5V,
because the 3.3V (OUT) rail at Pin 38 may be insuffcient to deliver enough 3.3V for the Pico and the SDCard Read/Writer :(
