allow loadups on pi

* Update README.md

* update (new M1)

README.md

@@ -4,7 +4,7 @@ Maiko is the implementation of the Medley Interlisp virtual machine, for a
 byte-coded Lisp instruction set and some low-level functions for
 connecting with Lisp for access to display (via X11) and disk etc.
 
-Newcomers should check out the [Medley Interlisp Introduction](https://github.com/Interlisp/medley/wiki/Medley-Interlisp-Introduction).
+For an overview, see [Medley Interlisp Introduction](https://github.com/Interlisp/medley/wiki/Medley-Interlisp-Introduction).
 
 See [the Medley repository](https://github.org/Interlisp/medley) for
 * [Issues](https://github.com/Interlisp/medley/issues) (note that maiko issues are there too)
@@ -33,18 +33,17 @@ $ cd maiko/bin
 $ ./makeright x
 ```
 
-* The build will (attempt to) detect the OS-type and cpu-type. It will build binaries `lde` and `ldex` in `../ostype.cputype` (with .o files in `..ostype.cputype-x`. For example, Linux on a 64-bit x86 will use `linux.x86_64`, while MacOS 11 on (new) Mac will use `darwin.arm64`.
-* If you prefer using `gcc` over `clang`, you will need to edit the makefile fragment for your configuration (`makefile-ostype.cputype-x1) and comment out the line (with a #) that defines `CC` for `clang` and uncomment the line (delete the #) for the line that defines `CC` for `gcc`.
-* There is a cmake configuration (TBD)
+* The build will (attempt to) detect the OS-type and cpu-type. It will build binaries `lde` and `ldex` in `../ostype.cputype` (with .o files in `..ostype.cputype-x`. For example, Linux on a 64-bit x86 will use `linux.x86_64`, while MacOS 11 on a (new M1) Mac will use `darwin.aarch64`.
+* If you prefer using `gcc` over `clang`, you will need to edit the makefile fragment for your configuration (`makefile-ostype.cputype-x`) and comment out the line (with a #) that defines `CC` for `clang` and uncomment the line (delete the #) for the line that defines `CC` for `gcc`.
+* There is a cmake configuration (TBD To Be Described here).
 
 ### Building For MacOS
 
 * Running on MacOS requires an X server, and building on a Mac requires X client libraries.
-An X-server for x86 MacOS (and X11 client libraries) can be freely obtained at https://www.xquartz.org/
-For the new arm64 MacOS 11, you'll need https://x.org which you can get via MacPorts or Brew.
+An X-server for MacOS (and X11 client libraries) can be freely obtained at https://www.xquartz.org/releases
 
 ### Building for Windows 10
 
-Windows 10 currently requires "Docker for Desktop" or WSL2 -- basically a Linux virtual machine -- and a (Windows X-server).
+Windows 10 currently requires "Docker for Desktop" or WSL2 and a (Windows X-server).
 See [Medley's README](https://github.com/Interlisp/medley/blob/master/README.md) for more.
 

bin/makefile-init-linux.armv7l

@@ -0,0 +1,27 @@
+# Options for Linux, ARMv7 and X-Window INIT
+
+CC = gcc $(GCC_CFLAGS)
+#CC = clang $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)xmkicon.o \
+	$(OBJECTDIR)xbbt.o \
+	$(OBJECTDIR)dspif.o \
+	$(OBJECTDIR)xinit.o \
+	$(OBJECTDIR)xscroll.o \
+	$(OBJECTDIR)xcursor.o \
+	$(OBJECTDIR)xlspwin.o \
+	$(OBJECTDIR)xrdopt.o \
+	$(OBJECTDIR)xwinman.o
+
+XFLAGS = -DXWINDOW
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS =  -O0 -g3
+DFLAGS = $(XFLAGS) -DRELEASE=351 -DINIT
+
+LDFLAGS = -L/usr/X11/lib -lX11 -lc -lm
+LDELDFLAGS =  -L/usr/X11/lib -lX11 -lc -lm
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde 

bin/makefile-linux.aarch64-x

@@ -0,0 +1,27 @@
+# Options for Linux, ARMv7 and X-Window
+
+CC = gcc $(GCC_CFLAGS)
+#CC = clang $(CLANG_CFLAGS)
+
+XFILES = $(OBJECTDIR)xmkicon.o \
+	$(OBJECTDIR)xbbt.o \
+	$(OBJECTDIR)dspif.o \
+	$(OBJECTDIR)xinit.o \
+	$(OBJECTDIR)xscroll.o \
+	$(OBJECTDIR)xcursor.o \
+	$(OBJECTDIR)xlspwin.o \
+	$(OBJECTDIR)xrdopt.o \
+	$(OBJECTDIR)xwinman.o
+
+XFLAGS = -DXWINDOW
+
+# OPTFLAGS is normally -O2.
+OPTFLAGS =  -O2 -g3
+DFLAGS = $(XFLAGS) -DRELEASE=351
+
+LDFLAGS = -L/usr/X11/lib -lX11 -lc -lm
+LDELDFLAGS =  -L/usr/X11/lib -lX11 -lc -lm
+
+OBJECTDIR = ../$(RELEASENAME)/
+
+default	: ../$(OSARCHNAME)/lde ../$(OSARCHNAME)/ldex

inc/subrs.h

@@ -191,6 +191,4 @@
 #define user_subr_DUMMY	012
 #define user_subr_SAMPLE_USER_SUBR	00
 
-/* Experimental yield */
-#define sb_YIELD                        0322
 #endif

src/subr.c

@@ -29,7 +29,6 @@
 /***********************************************************/
 
 #include <stdio.h>
-#include <time.h>
 #include "lispemul.h"
 #include "address.h"
 #include "adr68k.h"
@@ -780,20 +779,6 @@ void OP_subrcall(int subr_no, int argnum) {
       break;
     }
 #endif /* LPSOLVE */
-  case sb_YIELD: {
-      struct timespec rqts = {0, 833333};
-      unsigned sleepnanos;
-      POP_SUBR_ARGS;
-      N_GETNUMBER(args[0], sleepnanos, ret_nil);
-      if (sleepnanos > 999999999) {
-          TopOfStack = NIL;
-          break;
-      }
-      rqts.tv_nsec = sleepnanos;
-      nanosleep(&rqts, NULL);
-      TopOfStack = ATOM_T;
-      break;
-  }
     default: {
       char errtext[200];
       sprintf(errtext, "OP_subrcall: Invalid alpha byte 0%o", ((*(PC + 1)) & 0xff));