264 joystick converter

last couple of months, I was very busy creating several new interfaces and converters.
one of these is the joystick converter for the 264 family systems.
this family has a 8 pin mini din as joystick connection.
a simple converter with only wires should work for a default joystick.
But joysticks that uses 5 volt for something like autofire would fail.

normally a joystick uses a switch between ground and a direction pin.
the 264 family uses a “select line” instead.

the converter I found on the internet used a latch (74f244) to control when the signals are send to the computer.
this way “more advanced” joysticks can be used.

for build details follow this link.

other things I’m building are a joystick switch to be build into the c64 and a diag264 harness.

SD2IEC build

Added the Card Detect signal that was missing on the header

Last week I managed to complete my SD2IEC.
The PCB I created contained some little faults.
The silkscreen of the LEDs was wrongly positioned, and the DATA and CLOCK label of the serial port were swapped.
So I fixed the issues by swapping back the labels, and selecting a correct package for the LEDs (fault was in the component library).
The fixed version can be found on easyeda.com
I tried to program the AVR with AVRdude, but only got an error back (some sync error).
So finally I took my old STK500 development board, and downloaded AVRStudio from Microchip.
With this I could program the MCU and after hooking up the SD2IEC to my C64, I could access it like a drive.
(I uploaded the SW1 bootloader for the M1284P with the following High:0x92, Low:0xEF and Extended:0xFD)
On the 2nd photo you see a modification of the mico SD module.
the module didn’t have the card detect signal on it’s pins, so I wired a wire for this signal.
the card detect can also be controlled by the dip switches.
another signal that is not pressent is the write protect signal.
Micro SD cards don’t have this, so this is also handled by the dip switch.

HCC meeting 17 February 2017

last Saturday 17 February it was again the 2 monthly meeting of the Commodore HCC club.
on these meetings not only Commodore fans are comming, but also other retro computer fans join.
You will find MSX, Atari and other systems here.
I had a “little” gift to the guy that is starting a computer museum, a Toshiba hard disk from 1980.
I have no clue what capacity it had, but guessing it will be around 5 to 10 MB.
The little 2.5″ pata hd on top is from Jan Derogee (the creator of the Cassiopei and 1541-III). he was sitting in opposite of me.
My collection also grew a little with a oceanic drive, c64 test set, some books and DD floppies and an Amiga 500.
The Amiga has a broken drive and the case is not very nice, but I will use the keyboard to fix my Amiga 500+.
The main board will be stored for spare parts, or for testing purpose.

Visit the Facebook page of the Commodore HCC club to learn more about the meetings

Finally an update on the kernal selector for the Commodore 16

I finally managed to create a page on the kernal selector for the Commodore 16.
Last couple of months I was very busy repairing an Amiga 2000.
But last week I made some time to create a schematic of the circuit I created.
The circuit uses an Arduino Nano to listen to the reset line and reacts to it’s use.
this way you don’t need to drill a hole in the case, and the already existing reset button can be used to control multiple mods.

Upgrade the Commodore 16 to 64Kb of ram

Yesterday I upgraded my Commodore 16 to 64 Kb of memory.
I’m still not sure if I can call my Commodore 16 now a Commodore 64 😛 .

Now it can run most Programs created for the Plus/4.
I wrote a little story on how to do this.
You can find it here.

This is first mod I did on my Commodore 16, I’m already planning to do more mods, like adding the 3-1 function rom of the Plus/4, Jiffy dos and a way to enable/disable and select the rom(s).

 

Old project

IECATA

Yesterday I found an old project I made several years ago.
It’s a IECATA an ide interface for the commodore computers with the iec connector like the VIC20 and C64.
It’s based on a microprocessor and some memory.
The system lets you use the default commands to load and save files to an ide harddisk.

Later some other sites like www.dienstagstreff.de and 8bit.yarek.pl picked up the idea and made new versions of this project.