Micro cassettes with computer programs.

Last Updated or created 2023-06-30

I’ve got some micro cassettes with programs for P2000 and the Microtrainer (SDK-85).

Lets try to get this into executable code again.

(I sold my Philips P2000 last year before I found these tapes)

I bought a Cassette player (voice memo recorder) from Marktplaats (dutch ebay), and a mini jack cable (2.5mm to 3.5mm)

There are two things i’m going to try.

Converting the recorded audio into executable code using python or Puredata.
And making a print to connect the tape player to the SDK-85.

Connecting the player to a soundcard gave me:
Signed 16bit 44.1 kHz

(there are simular projects like this for C64 tapes and alike)
So there will be FFT tricks involved.

While browsing though this book:

I found this schematic: (page A1-39)

So that’s next to build

Python Spotify Genre Cube v2

Last Updated or created 2023-06-30

Spotify version

Next to do: Lasercut a wooden cube with better lettering.

Run the python part on a server


First export some API credentials

export SPOTIPY_CLIENT_ID=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
export SPOTIPY_CLIENT_SECRET=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
export SPOTIPY_REDIRECT_URI="http://localhost:8080/callback"

Code below:

from flask import Flask, request, redirect
from requests_oauthlib import OAuth2Session
from requests.auth import HTTPBasicAuth
import requests
import json
import spotipy
from spotipy.oauth2 import SpotifyOAuth
from pprint import pprint
from time import sleep
import spotipy.util as util
import sys
import paho.mqtt.client as mqttClient
import time
import os
import subprocess

Connected = False

broker_address = "MQTTSERVER"
port = 1883

def on_connect(client, userdata, flags, rc):
    if rc == 0:
        print("Connected to broker")
        global Connected
        Connected =True
        print("Connection failed")

def on_message(client, userdata, message):
    print (message.payload)
    myurl = 'spotify:playlist:' + str(message.payload.decode())

    results = sp.start_playback(context_uri=myurl, offset={"position": 1})

client = mqttClient.Client("PythonSpotifyGenreCube")
client.on_connect = on_connect
client.on_message = on_message

client.connect(broker_address, port=port,keepalive=60 )
time.sleep(4) # Wait for connection setup to complete
#client.loop_stop()    #Stop loop

#while Connected != True:
#    client.loop()
#    time.sleep(0.1)
#    print("test")
#    client.subscribe('spotify/playlist')

app = Flask(__name__)

AUTH_URL = 'https://accounts.spotify.com/authorize'
TOKEN_URL = 'https://accounts.spotify.com/api/token'
REDIRECT_URI = 'http://localhost:8080/callback'
CLIENT_ID = "xxxxxxxxxxxxxxxxxx"
CLIENT_SECRET = "xxxxxxxxxxxxxxxxxxxxx"

def login():
    spotify = OAuth2Session(CLIENT_ID, scope=SCOPE, redirect_uri=REDIRECT_URI)
    authorization_url, state = spotify.authorization_url(AUTH_URL)
    return redirect(authorization_url)

@app.route("/callback", methods=['GET'])
def callback():
    code = request.args.get('code')
    res = requests.post(TOKEN_URL,
        auth=HTTPBasicAuth(CLIENT_ID, CLIENT_SECRET),
            'grant_type': 'authorization_code',
            'code': code,
            'redirect_uri': REDIRECT_URI
    return json.dumps(res.json())

username = "fashice"
scope = "user-read-playback-state,user-modify-playback-state,playlist-read-private"

sp = spotipy.Spotify(client_credentials_manager=SpotifyOAuth(scope=scope))

# Shows playing devices
res = sp.devices()

# Change track
#results = sp.start_playback(context_uri=myurl, offset={"position": 1})

## Change volume

playlists = sp.user_playlists(username)

#for playlist in playlists['items']:
#    print(playlist['name'])

playlists = sp.current_user_playlists()
#print (playlists)
for playlist in playlists['items']:
    print(playlist['id'] + ' ' +  playlist['name'])

#if __name__ == '__main__':
#   app.run(port=8080,debug=True)

while Connected != True:

    while True:

except KeyboardInterrupt:
    print ("exiting")

ISA Prototyping print

Last Updated or created 2023-06-30

Got a delivery today …
Woot .. let the 8088/v20 hardware hacking commence!


First to do: LEDs, everybody loves blinking leds.
Next: Probably a address decoder with a VIA/CIA and a LCD Display.

Now I have to wait for my mouser order to be delivered.

Stop doing this in posts!

Last Updated or created 2023-06-30

See what I did?

Part x in my .. in don’t like series haha

Post topic: My life changed when changing this one setting.
Answer: Congratulations, you have a boring life.

Post topic: You are using this and that wrong!
Answer: No I don’t

Post topic: Only 1% see this optical illusion/What you see first tells you what kind of person you are./You are a genius when you find the numbers in this illusion.
Answer: No it doesn’t

Post topic: This setting is ruining your experience.
Answer: No I like it in the current setting

Post topic: Creepy HIDDEN map tracks .. blah blah.
Answer: No its not hidden, and it there by default and can be toggled using the settings menu.

Post topic: Do this now! You will be happy you did.
Answer: No I don’t, didn´t and never will

Post topic: Expect has cracked the code for a happy life.
Answer: Suuure..

Post topic: The BEST recipe for …
Answer: Depends what you like, maybe its a GOOD recipe, liked by more people.

Post topic: The top 10/best .. you have to own.
Answer: My top 10 is different, shutup.

Also .. this Popup over popup ….

Machine code Monitor in ROM on real BBC Acorn Hardware

Last Updated or created 2023-06-27

My BBC Acorn model B is working again. The original monitor is still dead.

Time to play with some machine code and ROMs.

My machine has a NFS rom installed. (NetFS)

Econet was Acorn Computers’s low-cost local area network system, intended for use by schools and small businesses. It was widely used in those areas, and was supported by a large number of different computer and server systems produced both by Acorn and by other companies.

I found a ROM online called Gremlin. It is a 16K rom file. But at the moment I only got some 28C64 (8k) or 28C256 (32k) eeproms.

32k it is. But de beeb having address line A14 floating high, I need to flash the upper 16k of the 32k ROM.

So I made the 16K rom into a 32K using cat

cp Gremlin\ v1.21\ \(1983\)\(Computer\ Concepts\).rom 16k.rom
cat Gremlin\ v1.21\ \(1983\)\(Computer\ Concepts\).rom >> 16k.rom

minipro -w 16k.rom -p AT28C256

I got the rom from this page:

Below booting straight into the monitor program.


6502 and Wozmon

Last Updated or created 2023-06-24

Ben posted a youtube about Wozmon running on his 6502.

In 1976, Steve Wozniac wrote what’s commonly known simply as Wozmon.

Wozmon is a machine-code monitor program written by Wozniak for the Apple 1. In Only 256 bytes ! Being pure 6502 code easily adaptable.
A monitor program allows you to view/edit and run machine code using simple commands.

I’ve got a different setup as Ben’s computer.
But changing the necessary, and it will run on my 6502.

I’m not using rs232 voltage levels (-7 till -25 and +7 till +25 volts).
I’m using a usb serial uart standard 5v leveling stick …

For address decoder see other post

Simplified schematic of my UART/ACIA

Compiling the Wosmon gave me an error, DEC is not a valid opcode for a bare 6502 .. but we have a 65c02.
Solution: Add -c02 extra opcodes

error 1 in line 187 of "wozmon.s": illegal operand types
>                DEC                    ; Decrement A.

# fix .. add -c02
vasm6502_oldstyle -c02 -Fbin -dotdir wozmon.s

Below Apple I Manual with the sourcecode for Wozmon

Debugging a cool robot

Last Updated or created 2023-08-16

A friend bought a mini robot for his son.
But it didn’t work as it should.

No way i let this opportunity pass to play with it!

This is the one:
Maqueen Plus V2 – Geavanceerde STEM Educatie Robot voor micro:bit


So you can program this in a blockly like manner.

Problems we encountered:

  • Uploading didn’t work
    Solution: Using chrome it had access to the usb port to upload, firefox didn’t work
  • The program didn’t compile, faulty or zero size hex file.
    Solution: Wrong Maqueen library was in the examples
    (After changing, needed version update also, see below)
  • Not everything is in Dutch (I like English, but this is for the boy), maqueen V2 needed a lot of translation.
    (So we joined https://crowdin.com/project/makecode/nl to help translating the libraries)

Apparently my AI camera can be connected to this robot!

GLaBios and own code

Last Updated or created 2023-06-22

Altered glabios to run code at F600:0000 instead of basic rom.
(Needs to have code to check if rom exists)

My test code and generating rom is below:
It should set leds on the keyboard to on .. we will see tomorrow.

NAME mycode
.model small
ORG 0h

start:	mov al, 11000000b
        out 80h, al
loop1:  nop
	jmp loop1
ORG 1fffh ; end of rom
	db 0

makefile is:


That looks okay!

C0 = 11000000
OUT = E6
80h = 80h
90 = NOP
EB = relative jump
FD = -3 to NOP instruction

Shelly Dimmer and NodeRed an update ..

Last Updated or created 2023-06-21

Our bedroom has a shelly dimmer, this one is connected with a wall switch and is being controlled by Domoticz, Home Assistant and NodeRed.

I had to fix some stuff, so this was a perfect time to jot down some notes.

I’ve wired it up like this:
(I’ve got a Line wire in my ceiling socket, so i placed the module there instead of the wall socket)

Configure the Shelly as mentioned in the manual. After that do the following:
Advance > Developer settings :
(Enable CoIot if you want a easy auto detect for Home Assistant)
Enable MQTT (This will DISABLE cloud ! )
Server: the ip number of your Mqtt Broker

Next I did was:

Now the wall switch will change/toggle what the current state is.
(If the light is off, and you switch it on using Mqtt, you probably needed to hit the switch two times to turn it off again. Not so with this setting.)

My Nodered Flow ( Not using the Shelly palette nodes in this example)

The Mqtt IN node sets the state of the switch when you use the wall switch!
Cozy turns light on at a specific level.
The slider send an off command when 0% selected, else an on command and the sliders value.

# Cozy function
msg.payload = {};
return msg;

# Slider function
var varlevel = msg.payload;
msg.payload = {};
if(varlevel == 0){ 
} else
return msg;


The Flow

        "id": "32d1c58277d38408",
        "type": "ui_switch",
        "z": "746c372deb597681",
        "name": "",
        "label": "Bedroom lights2",
        "tooltip": "",
        "group": "c387df0cfc06c60e",
        "order": 3,
        "width": 0,
        "height": 0,
        "passthru": false,
        "decouple": "true",
        "topic": "",
        "topicType": "str",
        "style": "",
        "onvalue": "on",
        "onvalueType": "str",
        "onicon": "",
        "oncolor": "",
        "offvalue": "off",
        "offvalueType": "str",
        "officon": "",
        "offcolor": "",
        "animate": true,
        "className": "",
        "x": 220,
        "y": 940,
        "wires": [
        "id": "fb12eddd50d3013e",
        "type": "ui_slider",
        "z": "746c372deb597681",
        "name": "",
        "label": "Bedroom Lights2",
        "tooltip": "",
        "group": "c387df0cfc06c60e",
        "order": 4,
        "width": 0,
        "height": 0,
        "passthru": true,
        "outs": "end",
        "topic": "",
        "topicType": "str",
        "min": 0,
        "max": "100",
        "step": 1,
        "className": "",
        "x": 230,
        "y": 900,
        "wires": [
        "id": "d9c299ec7c0c82b0",
        "type": "function",
        "z": "746c372deb597681",
        "name": "Get level",
        "func": "var varlevel = msg.payload;\nmsg.payload = {};\n\nif(varlevel == 0){ \nmsg.payload.turn=\"off\";\n} else\n{\n    msg.payload.turn=\"on\";\n}\n\nmsg.payload.brightness=varlevel;\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 460,
        "y": 900,
        "wires": [
        "id": "df432d3faea35f38",
        "type": "mqtt out",
        "z": "746c372deb597681",
        "name": "",
        "topic": "shellies/shellydimmer-CFE204/light/0/command",
        "qos": "",
        "retain": "",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "8c74c5f6.9a7a48",
        "x": 800,
        "y": 940,
        "wires": []
        "id": "315ffbe441467c10",
        "type": "mqtt out",
        "z": "746c372deb597681",
        "name": "",
        "topic": "shellies/shellydimmer-CFE204/light/0/set",
        "qos": "",
        "retain": "",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "8c74c5f6.9a7a48",
        "x": 780,
        "y": 900,
        "wires": []
        "id": "15f1c904607a0adc",
        "type": "function",
        "z": "746c372deb597681",
        "name": "Cozy",
        "func": "msg.payload = {};\n\nmsg.payload.turn=\"on\";\n\nmsg.payload.brightness=30;\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 450,
        "y": 860,
        "wires": [
        "id": "57fb1210d37e5325",
        "type": "ui_button",
        "z": "746c372deb597681",
        "name": "",
        "group": "c387df0cfc06c60e",
        "order": 5,
        "width": 0,
        "height": 0,
        "passthru": false,
        "label": "Bedroom lights2 Cozy",
        "tooltip": "",
        "color": "",
        "bgcolor": "",
        "className": "",
        "icon": "",
        "payload": "",
        "payloadType": "str",
        "topic": "topic",
        "topicType": "msg",
        "x": 240,
        "y": 860,
        "wires": [
        "id": "30cba96b08f3b830",
        "type": "mqtt in",
        "z": "746c372deb597681",
        "name": "",
        "topic": "shellies/shellydimmer-CFE204/light/0",
        "qos": "2",
        "datatype": "auto-detect",
        "broker": "8c74c5f6.9a7a48",
        "nl": false,
        "rap": true,
        "rh": 0,
        "inputs": 0,
        "x": 240,
        "y": 1000,
        "wires": [
        "id": "c387df0cfc06c60e",
        "type": "ui_group",
        "name": "Bedroom",
        "tab": "f177532a78f3f1d2",
        "order": 3,
        "disp": true,
        "width": "6",
        "collapse": true,
        "className": ""
        "id": "8c74c5f6.9a7a48",
        "type": "mqtt-broker",
        "name": "IPBROKER",
        "broker": "IPBROKER",
        "port": "1883",
        "clientid": "",
        "usetls": false,
        "compatmode": true,
        "keepalive": "15",
        "cleansession": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "closeTopic": "",
        "closePayload": "",
        "willTopic": "",
        "willQos": "0",
        "willPayload": ""
        "id": "f177532a78f3f1d2",
        "type": "ui_tab",
        "name": "House",
        "icon": "dashboard",
        "order": 1,
        "disabled": false,
        "hidden": false

A vacation in numbers and about taking pictures

Last Updated or created 2023-08-19

Italy 2023

Pictures : 2633 mobile + 2425 dslr
Movies : 52

Highest point: 1214m (Vesuvius)
Lowest: -40m

Pizza’s eaten:
Too many ( sometimes 2 times a day), it was hard to get something else to eat besides Pizza and Pasta.

Oldest building : 500BC

Km walked: 220Km
Km driven: ? (calculating) Will update when i post something about unwritten traffic rules in Italy.

Types of transport: Plane, train, metro/subway, bus, scooter, bike, car, walking

Temperature high: 32
Temperature low: 16

About the photos .. it finally happened.
More mobile photos where taken than with our trusty Nikon!
(Read our New Zealand post, why trusty .. rain damage on both Mobile and Nikon D750)

Some data about longer trips since 2010

This has multiple reasons:

  • Coline took loads of mobile phone pictures.
    (I was mostly in charge of the Nikon)
    She is trigger happy ..
  • We didn’t take the big camera always with us at night, going for dinner.
  • Sometimes it was too hot for me to focus on taking good pictures.
  • I didn’t make panoramic and time-lapse photos.

Why still use dlsr?

  • Better sensors (larger image chip) Small image ICs give more cross noise due to the image pixelsensors being to close to each other)
    So more pixels does NOT equal better images!
  • More control over your settings.
  • Better lenses and faster. Better aperture equals better DOF!!
    (Depth of field)