From f20b4d1be79db63b77f03d3455f7d9c6a8e97e10 Mon Sep 17 00:00:00 2001
From: giomba <giomba@glgprograms.it>
Date: Sat, 4 Mar 2023 23:09:40 +0100
Subject: [PATCH] First commit.

---
 .gitignore    |  2 ++
 Makefile      | 28 ++++++++++++++++++++++++++++
 README.md     | 18 ++++++++++++++++++
 main.asm      | 38 ++++++++++++++++++++++++++++++++++++++
 makepacket.py | 14 ++++++++++++++
 5 files changed, 100 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 README.md
 create mode 100644 main.asm
 create mode 100644 makepacket.py

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..dc84959
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+build/
+
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9fd556b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,28 @@
+.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)
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..66b9f29
--- /dev/null
+++ b/README.md
@@ -0,0 +1,18 @@
+# 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
diff --git a/main.asm b/main.asm
new file mode 100644
index 0000000..f183ab2
--- /dev/null
+++ b/main.asm
@@ -0,0 +1,38 @@
+    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
\ No newline at end of file
diff --git a/makepacket.py b/makepacket.py
new file mode 100644
index 0000000..7529cf0
--- /dev/null
+++ b/makepacket.py
@@ -0,0 +1,14 @@
+#!/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)