After a whole day soldering yesterday, ending up with a wire mess. Which didn’t work at the end…
Starting measuring some things, and create some test sketches (led blinky tests) I found out that the main problem was not having the red switches connected to GND. Blue switches where upside down, this was a easy fix. Because these are ON-ON switches, and where already connected to a common line. Then a mixup between D0 and D6 (wires crossed) And it is working! Made some lines and lettering on the frontplate after some playing around.
Sorting my fileserver i found a lot of Bash/Linux scripts maybe useful.
Some are tool usage only, maybe I’ll remove this page. But this being my own log/notebook, who knows
Port knocker .. opens port 22 when you send a tcp packet to port 1600 first. Note: when portscanning it wil close again when accessing 1601 or 1599. Note2: NOT active on my server .. duh!
(Open with a browser or telnet/netcat)
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -m recent --rcheck --name SSH -j ACCEPT
iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 1599 -m recent --name SSH --remove -j DROP
iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 1600 -m recent --name SSH --set -j DROP
iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 1601 -m recent --name SSH --remove -j DROP
iptables -A INPUT -m tcp -p tcp --dport 22 -j DROP
Dump and share your log, you get a short link to share
Start in screen
Start screen in "detached" mode. This creates a new session but doesn't attach to it. This is useful for system startup scripts.
/usr/bin/screen -d -m -S backup /usr/local/bin/backup.sh
screen -r backup
Screensize
ctrl-a :fix # Screensize fix
Memory leak check
pmap <pid> | tail -1
Memory leak .. pmap opslaan en vergelijken met een pmap later.
Listen to remote microphone local playback
ssh -C monitor@remoteserver arecord -f dat | aplay -f dat
Root login to named account
ssh-copy-id root@remote-server (one time only)
then:
ssh root@remoteserver
Lookup named account
cat /var/log/secure | grep publickey | cut -f6 -d: | while read ; do ssh-keygen -lf ~/.ssh/authorized_keys | grep $REPLY ;done
2048 SHA256:l85g/NvPnEy85UVfJ5LJw3NvPnEy85UVfJ5LJw3NvPnEy85UVfJ5LJw3 haanstoot@minka (RSA)
log into ovirt engine and postgres
psql -d engine -U postgres -c 'select vm_names,disk_profile_name,storage_id,disk_id,image_guid,disk_alias from public.all_disks;'
Gluster heal info
gluster volume info | egrep "Volume Name|Type" | grep -B1 Replicate | grep "Volume Name" | cut -c14- | while read ;do gluster volume heal $REPLY info > /tmp/$REPLY.out ; done
ls /tmp/*out | while read ;do cat $REPLY | grep entries | grep -v "Number of entries: 0" >/dev/null && echo $REPLY ;done | while read heal ; do cat $heal ;done | tac |sed -e '/Number of entries: 0/I,+1 d' | tac | uniq
Some work tips i’ve posted
VI
Vim comments
toevoegen
ga op de eerste regel van de te commenten regel staan
ctrl-v (visual)
naar beneden tot eind regel (met cursor of pagedown)
ctrl-i
#
esc (kan even duren)
verwijderen
ga op de eerste regel van de te uncommenten regel staan
ctrl-v (visual)
naar beneden tot eind regel (met cursor of pagedown)
x
esc
Als user config geedit en geen schrijfrechten?
:!bash
chmod 666 bestand
:wq
chmod bestand naar wat hij was
Input / verwerk door bash vanuit vi
:0,5 !sort # eerste 5 regels door sort heen halen
:r !date # datum in je tekst document
Vim tabs / multiple files
vi /etc/hosts /etc/services
:n
:prev
VIM7 tabs
vim -p /etc/hosts /etc/profile
:tabe /etc/services
:tabn
:tabp
Key mappen
:map <F7> :tabp <CR>
:map <F8> :tabn <CR>
zet deze in je $HOME/.vimrc ... zonder de eerste ":"
Vi redirect
:r date # datum in text
:1,5!sort -n # sorteren van eerste 5 regels met een extern commando (kan ook met shift v een visual gedeelte selecteren)
:0,$!cut -f1 -d: # alleen field 1 van text overhouden (delimiter :)
Vi inspringen bij loop code
selecteer met shift-v de regels die moeten inspringen.
daarna > of < gebruiken om te tabben
Speciale charakters met vi bekijken
:set list
een tab zier er dan uit als ^I
Bash
sudo vergeten in commando
service apache restart
sudo !!
Bash truck vorige commando
doet vorig commando met aangepast keyword
systemctl status ovirt-ha-broker.service
^status^start
{} expand
directory's archief30_tmp t/m archief35_tmp recursive directories chmod 2775 zetten
find achief{30..35}_tmp -type d -exec chmod 2775 {} \;
of
mkdir tmp{1..3}
echo pr{ut,utser}s
1 regel uit een script starten zonder copy-paste (bijvoorbeeld in een remote-console sessie)
grep ipa command uit cobber.ks en voor deze uit
( /usr/sbin/ipa-client-install --domain=mgtdomain --enable-dns-updates -w password --realm=domain --server=server.domain --hostname=hypervisor.domain --unattended --force-ntpd )
cat cobbler.ks | grep ipa | bash
Bash karakters omdraaien
Linkerhand rechterhand coordinatie probleem smile
upadte
ga op de d staan en druk ctrl-t
Bash laatste woord vorige regel
ls -latrd /var/data/extra/backup
chmod 775 <ESC(punt)>
Ssh forward bij een running sessie
[haanstoot@xxx202 ~]$
~C (tilde C)
-L8080:localhost:80 (redirect localhost port 80 naar eigen machine poort 8080
-D9999 (Dynamic socks forward, zie andere post in deze wiki)
CTRL-C werkt niet?
ctrl\
SSH .ssh/config
KeepAlive yes <---------- dont die on me
ServerAliveInterval 60 <---------- dont die on me
Host *.domain <-- voor alle hosts in radlan fast login en geen vraag over key
StrictHostKeyChecking no
UserKnownHostsFile=/dev/null
host *.domain <-- domain is altijd mijn user
user haanstoot
GSSAPIAuthentication no <-- speedup
host pruts*.domain
user pi
Parallel tasks
4 parallel jobs
find jpg -type f -name \*.jpg -print0 | xargs -0 -n1 -P4 ./convert.sh
clusterssh truck
clusterssh alle svgs <--- naar alle svgs
sudo su -
cd /bricks/*/store <--- cd naar deze als bestaat
cd /rhgs/brick0*/store <-- cd naar deze als bestaat (nu sta je in atelier directories als deze bestaat als root in de svgs)
pwd | grep store || logout <--- geen atelier dir waar je staat? dan logout
id | grep haanstoot && logout <-- net logout? dus eigen user ... dan logout
eindresultaat ... als root in atelier volumes op svgs waar ze bestaan
Start in screen
/usr/bin/screen -d -m -S backup /usr/local/bin/backup.sh
screen -r backup
Start screen in "detached" mode. This creates a new session but doesn't attach to it. This is useful for system startup scripts.
Sudo vergeten
systemctl restart httpd (wil niet als user)
sudo !!
(doet "sudo systemctl restart httpd")
Reuse arguments
Bijvoorbeeld:
# touch file1 file2 file3 file4
# chmod 777 !*
Voert uit: chmod 777 file1 file2 file3 file4
5 meeste disk gebruikers human readable
du -hsx * | sort -rh | head -5
rm groot bestand duurt lang
: > /mappen2/archieven/test.img
Check memory bankjes
sudo dmidecode| grep -i -B1 "Form Factor" (B1 betekend BEFORE 1 regel meenemen, A is AFTER)
Size: 8192 MB
Form Factor: DIMM
--
Size: 8192 MB
Form Factor: DIMM
--
Size: No Module Installed
Form Factor: DIMM
--
Set time and restart NTP service
sudo service ntpd stop && sudo ntpdate ntp1.domain && sudo ntpdate ntp2.domain && sudo service ntpd start
Aliases en terminal kleuren
In een terminal f*ckedup colors?
komt door de alias
alias ls='ls --color'
deze even uitzetten / niet gebruiken?
\ls
Werkt voor alle aliassen
Snelle delete
Niet onderstaande gebruiken voor grote dirs
rm -rf /path/bla
Maar
mkdir /tmp/leeg ; rsync -a --delete /tmp/leeg /path/bla
Bash best practices
BashBestPractices
Script log replay
script --timing=/tmp/time.txt /tmp/script.log
scriptreplay -t /tmp/time.txt /tmp/script.log
There are toooo many cool sniplets .. only adding when i’m bored.
Loads of stuff on my main fileserver. (Graph is a great tool called DUC) https://duc.zevv.nl/
Besides a search engine, i have a file finder. Due to the massive amount of data, i like to find things by other means than knowing the directory structure.
I can find files by filename, but also by contents.
I’ll talk about find by contents first.
I’ve got loads of documents in Pdf, HTML, txt, doc, sheets , wordperfect etcetera. Those documents i can find using a tool named Namazu. This is quite a old tool, but i’m using it for a long time and it still works great. I didn’t find a better replacement yet. (But i’ve been looking into : elasticsearch, Solr, Lucene)
http://www.namazu.org/ is easy to install, but if you want the tool to scrape different kinds of documents you have to add some additional software.
My multipurpose printer can scan pages in pdf. Those are only embedded jpg’s in a pdf container. I will talk about how i handle these later.
My current start page : This index contains 267,763 documents and 14,036,762 keywords.
Search example of namazu
Some things to consider when implementing namazu:
tweak the file types to scrape, it makes no sense to scrape binaries
you can set a parameter in the config for search only, this disables downloading the found link in the results!
Before Namazu i used HtDig.
Screenshot htdig
HtDIg also can scrape remote websites, Namazu can’t.
Preparing PDF for indexing:
I’ve written some scripts to make PDFs containing scanned text scrape-able. ( https://gitlab.com/fash/inotify-scanner-parser ) What it does:
My scanner puts a scanned pdf on my fileserver in a certain directory
Inotify detects a written file
it will copy the file, run OCR on it (tesseract) and writes a txt file (scapeable)
After that the text will be embedded (overlay) on the PDF, so now it becomes searchable/scrapeable
When certain keywords are found, it will sort documents in subdirs
Example from a scanned jpg, i can find OCR words! (note .. the overlay is exact on the found words)
Finding files by name:
For finding files a made a little webpage like this:
It is a simple webpage grabbing through a list of files. It takes the first keyword and does a grep, it takes a second keyword to match also. I can select different file databases to search. (This case is private) Between search and private i can give the number of entries to print. So i can do Search “ansible” NOT “tower” 50 entries from the public fileset
The Altair 8800 is a microcomputer designed in 1974 by MITS and based on the Intel 8080CPU. Interest grew quickly after it was featured on the cover of the January 1975 issue of Popular Electronics and was sold by mail order through advertisements there, in Radio-Electronics, and in other hobbyist magazines.
(picture from wikipedia)
UPDATE: 20220804 – Added Octal sheet
I alway loved the simple setup of this computer. There was no screen and no keyboard. Only later additions to the machine provided these.
One explanation of the Altair name, is that the name was inspired by Star Trek episode “Amok Time“, where the Enterprise crew went to Altair (Six).
There are only a few differences between the used 8080 CPU and the 8085 CPU of a machine i learned machinecode on.
See : https://www.henriaanstoot.nl/1989/01/01/8085-machinecode-at-school/
So for a really long time i wanted to have a Altair alike machine. There are do it yourself kits for sale. Which look like perfect relica’s and there are virtual machines and emulators. But i wanted to have the feeling of throwing the switches. You can find a emulator here (https://s2js.com/altair/)
So i bought the components, a poker case which can hold the machine. And started building today.
The backend is a arduino based emulator, but with real leds and switches! (https://create.arduino.cc/projecthub/david-hansel/arduino-altair-8800-simulator-3594a6)
Components and pokercaseDrillingFirst looks
Next to do:
Fix plate into case
Solder a LOT of wires and components!
Shall i get rid off the transitors and use darlington arrays?
Put lettering on the aluminium plate : Functions and Bus information.
Build a power connector in the case
And then … programming 🙂
UPDATE: 20220804 – Added Octal sheet
The Altair is a octal based machine, but i couldn’t find a opcode list in Octal. So i generated one. When entering a MOV D,M instruction for example, you have to enter x 0 1 0 1 0 1 1 0 using the switches Thats 126 in octal but most tables are in hex ( MOV D,M is 56, which is 0101 0110 but not that clear on the switches)
Download from https://micropython.org/resources/firmware/esp32-20220618-v1.19.1.bin
Test with
screen /dev/ttyUSB0 115200
Enter import machine or help()
Great up and running
Now we have to install a boot loader Use ampy to list files
#list boot
ampy -p /dev/ttyUSB0 ls
/boot.py
#get boot.py
ampy -p /dev/ttyUSB0 get boot.py
vi boot.py (create new)
#import esp
#esp.osdebug(None)
#import webrepl
#webrepl.start()
def connect():
import network
sta_if = network.WLAN(network.STA_IF)
if not sta_if.isconnected():
print('connecting to network...')
sta_if.active(True)
sta_if.connect('WIFISSID', 'WIFIPASS')
while not sta_if.isconnected():
pass
print('network config:', sta_if.ifconfig())
Push the file
ampy -p /dev/ttyUSB0 put boot.py
Usage: ampy [OPTIONS] COMMAND [ARGS]...
ampy - Adafruit MicroPython Tool
Ampy is a tool to control MicroPython boards over a serial connection.
Using ampy you can manipulate files on the board's internal filesystem and
even run scripts.
Options:
-p, --port PORT Name of serial port for connected board. Can optionally
specify with AMPY_PORT environment variable. [required]
-b, --baud BAUD Baud rate for the serial connection (default 115200).
Can optionally specify with AMPY_BAUD environment
variable.
-d, --delay DELAY Delay in seconds before entering RAW MODE (default 0).
Can optionally specify with AMPY_DELAY environment
variable.
--version Show the version and exit.
--help Show this message and exit.
Commands:
get Retrieve a file from the board.
ls List contents of a directory on the board.
mkdir Create a directory on the board.
put Put a file or folder and its contents on the board.
reset Perform soft reset/reboot of the board.
rm Remove a file from the board.
rmdir Forcefully remove a folder and all its children from the board.
run Run a script and print its output.
Connect to serial console using screen
sudo screen /dev/ttyUSB0 115200
(use CTRL-A \ to exit)
Connect to wifi
import boot
connect()
Led blinky test, with below file named ledtest.py
import time
from machine import Pin
led=Pin(2,Pin.OUT) #Internal led pin
while True:
led.value(1) #Set led turn on
time.sleep(0.5)
led.value(0) #Set led turn off
time.sleep(0.5)
Upload and run script
ampy -p /dev/ttyUSB0 put ledtest.py
import ledtest (without .py!)
Next todo: boot.py @boot ?!? Run custom python after booting. Connect display and play with drawing.
Tip: Install rshell !
sudo pip3 install rshell
fash@zspot:~$ rshell
Welcome to rshell. Use Control-D (or the exit command) to exit rshell.
No MicroPython boards connected - use the connect command to add one
/home/fash> autoconnect: /dev/ttyUSB0 action: add
/home/fash> ?
Documented commands (type help <topic>):
========================================
args cat connect date edit filesize help mkdir rm shell
boards cd cp echo exit filetype ls repl rsync
Use Control-D (or the exit command) to exit rshell.
Connecting the display
I’ve connected the display as above. Note the different connections on the display. Above fritzing part has connections for touch screen! The 4 or 5 pins on the other side are for sdcard functionallity.
Now you can use the library by editing a example like demo_bouncing_boxes.py
Add and change
# At the beginning of the file
import setupmydisplay.py
Futher down comment two lines and add your own setup
# Baud rate of 40000000 seems about the max
#spi = SPI(1, baudrate=40000000, sck=Pin(14), mosi=Pin(13))
#display = Display(spi, dc=Pin(4), cs=Pin(16), rst=Pin(17))
display = setup.createMyDisplay()
Upload to ESP32 and testing!
ampy -p /dev/ttyUSB0 put demo_bouncing_boxes.py
ampy -p /dev/ttyUSB0 put setupmydisplay.py
# connect and start
sudo screen /dev/ttyUSB0 115200
import demo_bouncing_boxes.py
I got a vintage racetrack from a colleage a while back.
In the past i had some ideas controlling train or race tracks. For train tracks i wanted to write intelligent maneuver software. For a racetrack a web controllable race. Maybe with a webcam mounted on the car??
L298N – DC motor controller
So i bought a little DC motor controller (2 channels) and took a esp32.
https://arduino.esp8266.com/stable/package_esp8266com_index.json,https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json
After that go to the Board manager.
Tools > Board: ..... > Board Manager
Search board, click and install.
NOTE: Some sketches require a specific version!
Select your board, and write/open you sketch.
First thing to do is test compiling your sketch
Press the little button on the left
Libraries:
When you get a compile error like below, you are missing those libraries
Goto tools > Manage libraries
Search for your needed library, sometimes there are multiple which look alike. This is a trial and error approach. Sometimes it doesn’t exists and you need to upload a zip containing the library. (Sketch > Include Library > Add .zip library
Downloading a zip containing the library
Adding the library zip file
When looking at the first lines of you sketch, there are include statements like:
But sometimes there are statements without the < > characters. Then it will be a included file just for your sketch.
Note the second tab MPU6050x.h which contains specific code only for this sketch.
Redo a test recompile using the tic icon again.
Everything okay? .. Select the correct port in Tools > Port And press the Arrowright icon to upload/flash. Note: sometimes you have to hold a button or press a little flash button on your device to flash.
esptool.py v3.3
Serial port COM8
Connecting.....
Chip is ESP32-D0WDQ6-V3 (revision 3)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: c8:c9:a3:f9:02:d0
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
Configuring flash size...
Flash will be erased from 0x00001000 to 0x00005fff...
Flash will be erased from 0x00008000 to 0x00008fff...
Flash will be erased from 0x0000e000 to 0x0000ffff...
Flash will be erased from 0x00010000 to 0x000c7fff...
Flash params set to 0x022f
Compressed 18880 bytes to 12992...
Writing at 0x00001000... (100 %)
Wrote 18880 bytes (12992 compressed) at 0x00001000 in 0.3 seconds (effective 482.8 kbit/s)...
Hash of data verified.
Compressed 3072 bytes to 128...
Writing at 0x00008000... (100 %)
Wrote 3072 bytes (128 compressed) at 0x00008000 in 0.0 seconds (effective 627.7 kbit/s)...
Hash of data verified.
Compressed 8192 bytes to 47...
Writing at 0x0000e000... (100 %)
Wrote 8192 bytes (47 compressed) at 0x0000e000 in 0.1 seconds (effective 1087.9 kbit/s)...
Hash of data verified.
Compressed 750976 bytes to 477779...
Writing at 0x00010000... (3 %)
...
...
...
Writing at 0x000bb633... (93 %)
Writing at 0x000c0acd... (96 %)
Writing at 0x000c6649... (100 %)
Wrote 750976 bytes (477779 compressed) at 0x00010000 in 6.3 seconds (effective 947.4 kbit/s)...
Hash of data verified.
Leaving...
Hard resetting via RTS pin...
Most of the boards you can connect via micro-usb. Sometimes you need adaptors like:
Attiny programmerttl uart interface
TIPS ‘n tricks:
Open same file in another editor, so you can compare for example the top (declarations) and futher down the code. Else you could be ending up scolling up/down all day long. And probably forgetting how a variablename was exacly spelled.
Use serial monitor! When debugging this is a valuable tool. Enter statements into you code, which prints debugging info to a serial monitoring window when your device is still hookedup to your PC.
Example printing connected IP and values registered
Other obvious tips: Add comment lines (documentation) Use variable names which make sense! ( Hard to find what aaaa() does, or what tmp-a is, but LastTempValue says a lot more)
The workshop at MCH2022 gave me the idea to make my next PCB not at home, but professionally.
I’m planning to make my 6502 on modular PCB’s when i’ve got the base part working. ( I probably will only make THT (Though Hole Technology) boards instead of smd ) So i’ll probably end up making a few boards, namely:
Power on reset
Clock module
Interconnect with arduino
CPU, memory and ROM
Display
6522 Via
SID chip
Hex keyboard
This power-on reset is based on the original C64 part to reset the CPU when you power the machine on. With my 6502 i have to manually push reset to start booting. (The CPU starts in a unknown state when you power it up, it needs a reset)
MCH2022 is a nonprofit outdoor hacker camp taking place in Zeewolde, the Netherlands, July 22 to 26 2022. The event is organized for and by volunteers from the worldwide hacker community.
Knowledge sharing, technological advancement, experimentation, connecting with your hacker peers and hacking are some of the core values of this event.
MCH2022 is the successor of a string of similar events happening every four years since 1989. These are GHP, HEU, HIP, HAL, WTH, HAR, OHM and SHA.
I’ve bin to several of these big events. Besides these big events are many different smaller events (wannull, ne2000 etc).
First one i’ve been was HIP97. I went with Bigred at that time. I had to get the tickets at that time, he didn’t had a handle at that time. It was Monique who came up with his new nick.
After HIP97 there was HAL2001 WTH2005 and OHM2013 which i was present. HAL2001 the whole ICEcrew was present, WTH a part of them, OHM a few and i was with a few PRUTS friends.
Now i was with my girlfriend, AND with Bigred again! Loads of fun and memories. Had not seen Bigred since a inbetween hacker party at my place. So ’97 and now ’22 .. jeez 25 years!
So MCH, it was great again. Loads of stuff to do and to see. Weather was … okay. Two days where really hot, one day some light rain but a load of wind. Our neighbours tent collapsed, beer tents where reenforced. First campsite with a supermarket! Music stage was awesome, lasers and fire!
I went to a lot of talks, even my girlfriend found some she was interested in.
OpeningAt nightLast time my tapeTinkeringtar cz ourstuff.tgz
This was the last time i’ve brought my “Windows free zone tape” This big roll of tape was used on many occasions. I got this roll somewhere < 2000, I did a search but couldn’t find anything mentioning it on the web. Maybe some archive.org entry?
Starting a Home Computer Museum (which i almost did in the past)
streaming 360 video (going to try this with my Vuze XR Camera)
Non-Euclidean Doom: what happens to a game when pi is not 3.14159… (Really enjoyed this one)
Hacking the genome: how does it work, and should we?
And more
Besides the talks i’ve done some workshops:
Micropython on the badge (see my other post)
Kicad – PCB designing
Meanwhile we where looking at all the villages and hackerspaces. Loads of interesting people to meet. Like our neighbour two tents futher, he was also a home-brewer, and he brought a minifridge with beer taps connected to it.
When back at our tent or Bigreds Campervan, we talked about differences now and then. New technology, what we’ve been upto in the last years and tinkering, loads of tinkering.
I’ve brough a big plastic container with .. ehh “things to do ….”
My 6502, bigred helped me debugging the 16*2 display. (Luckily his campervan was packed with electronics!) We cannibalized one of his projects for a display, and re-flashed his eeprom programming arduino to test my display. ( The arduino i had to reflash later to program a rom he had given me for my 6502. ) Other toys he gave me: Print for the programmer, and a C64 Cartridge print for Exrom and Game.
Mini C64 with a little screen and raspberry zero.
5050 ledstrip (didn’t had time to reprogram this for our mood-light)
Handheld gamehat: Bigred found some old games he played when he was young
Mikrotik router, because i wanted to make a dmz for my girlfriends laptop. (MS)
Playing around with my Vuze XR camera
Huskycam, which i’m planning to use on a racetrack
DVB-T DAB FM Stick, got some hints and tips from Bigred. (Note to myself … fix the antenna!)
My Arduino touch bagpipe player with i2c
The wifi deauther, which has a display which i wanted to use to make a programmable clock for my 6502. Using a rotary encoder and the display to control the speed in Hz.
I spend many hours playing with the Badge and Kicad
Wrote some 6502 assembly, arduino sketches, php, bash and micropython.
While playing around with the badge i got some things working easily. Spinning logo and blinky leds. Next goal to achieve was, to get the gyroscope to control the angle of spinning. Most of the code worked, but the gyro values stayed zero! (After many hours …. you have to start/enable the chip/measurements on the bno055 first! .. duh! )
I didn’t had my dev directory from my main battlestation synced in my nextcloud, so changing things for the 6502 was a b*tch. Used vasm and acme to generate a bin file to use to fill the rom. Didn’t like the eeprom programmer program, because i could not easily check the rom contents. Have to look into that later on.
While learning to use Kicad, which i only had been using to draw schematics (besides fritzing) , i learned to create a pcb. Which gave me the idea to make a print for the power-on-reset for the 6502. Which is going to be the first PCB by ordering, instead of the old skool messing around with DIY print making. (see next post)
….. Oh, why my display was not working? I even connected my 8bit logic analyzer to the pins of the display.
Everything was correct. But i didn’t use a variable resistor for the contrast. Just a simple resistor i could find. Luckily … bigreds stash. All those hours debugging, all for one resistor! (I have to mention, we had a suspicion halfway. But it was too hot and we where too lazy to go to Bigred’s campervan, to get a potentiometer. )
65c22 connected, new data, and address-bus ribboncables!
First led on Register B blinking!
Notes: Temporary display wil be 2×16 Chars. Ram in place, but not connected (is emulated by the Arduino Mega at the moment) Rom is somewhere halfway the atlantic ocean .. still waiting on that one. Ben Eatons clock module is disconnected, i’m using the Arduino as programmable clock right now. (There wil be a little display and a rotary encoder to set clock speed.)
lda #$ff ; all bits
sta $6002 ; set direction (out) for B register
lda #$80 ; set 1 bit
sta $6000 ; set register B
lda #$00 ; reset bit
sta $6000 ; set register B
jmp $8005 ; jmp to bit set part
"If something is worth doing, it's worth overdoing."