First commit.

.clang-format

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+# clang-format 15.0.7
+IndentWidth: 4
+AllowShortBlocksOnASingleLine: Empty
+AllowShortFunctionsOnASingleLine: Empty
+AlignConsecutiveMacros: true
+

.gitignore

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+build/
+
+*.o
+

Makefile

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+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)
+

README.md

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+# 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/).

src/ceda_print.c

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+#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++;
+    }
+}

src/ceda_print.h

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+#ifndef CEDA_PRINT_H
+#define CEDA_PRINT_H
+
+void ceda_print(const char* s);
+
+#endif // CEDA_PRINT_H
+

src/entrypoint.asm

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+EXTERN _main
+
+entrypoint:
+    ld sp,0xc000
+
+    call _main
+
+    jp ASMPC
+

src/main.c

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+#include "ceda_print.h"
+
+int main(void) {
+    ceda_print("Hello world!");
+
+    return 0;
+}
+