From 2645501186b896a8e939a0e3cb0b12bc632f1877 Mon Sep 17 00:00:00 2001
From: giomba <giomba@glgprograms.it>
Date: Sun, 8 Oct 2023 21:38:15 +0200
Subject: [PATCH] First commit.

---
 .clang-format      |  6 ++++++
 .gitignore         |  4 ++++
 Makefile           | 32 ++++++++++++++++++++++++++++++++
 README.md          |  7 +++++++
 src/ceda_print.c   | 11 +++++++++++
 src/ceda_print.h   |  7 +++++++
 src/entrypoint.asm |  9 +++++++++
 src/main.c         |  8 ++++++++
 8 files changed, 84 insertions(+)
 create mode 100644 .clang-format
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 README.md
 create mode 100644 src/ceda_print.c
 create mode 100644 src/ceda_print.h
 create mode 100644 src/entrypoint.asm
 create mode 100644 src/main.c

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..6ba126f
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,6 @@
+# clang-format 15.0.7
+IndentWidth: 4
+AllowShortBlocksOnASingleLine: Empty
+AllowShortFunctionsOnASingleLine: Empty
+AlignConsecutiveMacros: true
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b863b11
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+build/
+
+*.o
+
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ed530f4
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,32 @@
+SRC = \
+	  src/ceda_print.c		\
+	  src/entrypoint.c		\
+	  src/main.c 			\
+	  \
+
+OBJ = $(patsubst %, %.o, $(basename $(SRC)))
+
+ECHO	:=	@echo
+QUIET	:=	@
+OUTDIR	:=	build
+
+$(OUTDIR)/main.prg: $(OUTDIR)/main.rom
+	dd if=$< of=$@ bs=1 seek=2
+
+$(OUTDIR)/main.rom: $(OBJ) | $(OUTDIR)
+	zcc +z80 -create-app --no-crt -m -o $@ $?
+
+%.o: %.c
+	zcc +z80 -c -o $@ $<
+
+%.o: %.asm
+	zcc +z80 -c -o $@ $<
+
+$(OUTDIR):
+	mkdir -p $@
+
+.PHONY: clean
+clean:
+	$(RM) $(OBJ)
+	$(RM) -r $(OUTDIR)
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..bad3e2e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,7 @@
+# ceda-demo
+
+Demo for the Sanco 800x.
+
+The purpose of this demo is mainly to thinker with the hardware of the mentioned computer, since we are reverse-engineering it, and even writing an emulator.
+
+This repository is part of the [CEDA project](https://github.com/GLGPrograms/ceda-home) by [Retrofficina GLG Programs](https://retrofficina.glgprograms.it/).
diff --git a/src/ceda_print.c b/src/ceda_print.c
new file mode 100644
index 0000000..454621e
--- /dev/null
+++ b/src/ceda_print.c
@@ -0,0 +1,11 @@
+#include "ceda_print.h"
+
+void ceda_print(const char *s) {
+    static char *const VIDEO_MEMORY = (char *const)(0xd000);
+
+    char *p = VIDEO_MEMORY;
+
+    while (*s != '\0') {
+        *p++ = *s++;
+    }
+}
diff --git a/src/ceda_print.h b/src/ceda_print.h
new file mode 100644
index 0000000..b2c7767
--- /dev/null
+++ b/src/ceda_print.h
@@ -0,0 +1,7 @@
+#ifndef CEDA_PRINT_H
+#define CEDA_PRINT_H
+
+void ceda_print(const char* s);
+
+#endif // CEDA_PRINT_H
+
diff --git a/src/entrypoint.asm b/src/entrypoint.asm
new file mode 100644
index 0000000..89991d9
--- /dev/null
+++ b/src/entrypoint.asm
@@ -0,0 +1,9 @@
+EXTERN _main
+
+entrypoint:
+    ld sp,0xc000
+
+    call _main
+
+    jp ASMPC
+
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..61699bd
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,8 @@
+#include "ceda_print.h"
+
+int main(void) {
+    ceda_print("Hello world!");
+
+    return 0;
+}
+