RunCPM for the Raspberry Pico
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
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) :
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 :(
