First commit.

.gitignore

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+build/
+

Makefile

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+.POSIX:
+
+ECHO	:=	@echo
+QUIET	:=	@
+
+OUTDIR		:= build
+SERIALPORT	:= /dev/ttyUSB0
+
+$(OUTDIR)/main.bin: main.asm
+	$(ECHO) '	ASM'
+	$(QUIET) mkdir -p $(OUTDIR)
+	$(QUIET) zcc +z80 -subtype=none -o $(OUTDIR)/main.bin main.asm
+
+.PHONY: send
+send: $(OUTDIR)/main.bin.pkt
+	$(ECHO) '	SEND'
+	$(QUIET) stty -F $(SERIALPORT) 9600 -crtscts
+	$(QUIET) cat "$<" > $(SERIALPORT)
+
+$(OUTDIR)/%.bin.pkt: $(OUTDIR)/%.bin
+	$(ECHO) '	PKT'
+	$(QUIET) python3 makepacket.py "$<"
+
+.PHONY: clean
+clean:
+	$(ECHO) '	RM'
+	$(QUIET) rm -rf $(OUTDIR)
+

README.md

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+# CEDA Utils
+
+You've your Sanco retrocomputer, but you have no peripherals and no disks, so you have no idea how to interact with it.
+Here you can find some utilities to jump start your computer from scratch!
+
+## Bill of materials
+
+- RS232 DB-25 cable
+  - depending on your supplies, if you are working in the 3rd millenium, maybe you also need some adapters (eg. USB/RS-232), "ancient" cables (eg. old fashioned DB-9/DB-25 serial cable), and maybe a DB gender changer (no pun intended)
+- EEPROM programmer for 28C32 (or larger)
+  - you can even build one with an Arduino
+- 28C32 blank EEPROM
+- common hardware tools (eg. screwdrivers)
+
+:warning: Mess with electronics only if you know what you are doing. Beware: you may harm your computer, or even yourself! Everything you do is at your own risk.
+
+## How to
+- to be written

main.asm

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+    org 0x1000
+
+prhex = $c174
+putchar = $c45e
+
+PUBLIC _main
+_main:
+    ld      hl,$0000
+
+main_loop:
+    ld      a,$0e
+    out     ($a0),a
+    ld      a,h
+    out     ($a1),a
+
+    ld      a,$0f
+    out     ($a0),a
+    ld      a,l
+    out     ($a1),a
+
+    call    delay
+    inc     hl
+    jp      main_loop
+
+    jp      ASMPC
+
+
+delay:
+    push    de
+    ld      de,$0000
+delay_loop:
+    dec     de
+    ld      a,d
+    or      e
+    jr      nz,delay_loop
+
+    pop     de
+    ret

makepacket.py

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+#!/usr/bin/python3
+
+import sys
+import struct
+
+filename = sys.argv[1]
+
+ofile = open(filename + ".pkt", 'wb')
+
+ifile = open(filename, 'rb')
+content = ifile.read()
+
+ofile.write(struct.pack("<HH", 0x1000, len(content)))
+ofile.write(content)