Neue Laufwerksemulation - Pi1541

Moin,

Ich hab ne Frage zum Preis für ne fertige Pi1541. Hab hier gesucht, aber nix gefunden, deshalb frage ich.

Wieviel kostet ne, fertig aufgebaute, Pi1541 mit Gehäuse? Ich suche eine.

Und da ich keinen Preis kenne konnte ich noch keine Suchanfrage im Marktplatz stellen.

aktuell hab ich leider immer noch keinen funktionalen 3D-Drucker ..deshalb kann ich keine "fertigen" Geräte anbieten

aber, wenn du dich darum selbst kümmerst, kann ich dir gern eine Platine für ..ca. 25€ aufbauen - allerdings brauchst du dann noch einen PI Zero 1.3

https://www.berrybase.de/raspberry-pi-zero-v1.3

kostet halt momentan allein schon 12€

20211014_165558.jpg ..sieht dann ungefähr so aus

Gehäuse wäre nais to have. Ist aber kein "muss". Meine Sidekick64 und WiC64 haben auch keine Gehäuse. Ich mag dieses "naked" Design.

Dein Angebot klingt klasse. Da schlag ich doch zu. Alles weitere dann per PM.

Noch ne Frage zum Pi. Muss das zwingend ein Zero 1.3 sein, oder kann man auch nen Zero 2 nehmen?

Tante Edith sagt :

Frage zum Pi, durch lesen, selbst beantwortet

Nur zur Info vorab:

Steve White hat heute eine neue Beta für Tester bereitgestellt, sie trägt die Version v1.25_beta_F

Wie immer wird die Firmware nur für Tester und Unterstützer in einem geschützten Bereich zum Download angeboten!

Zitat

Here is a new Beta version;- Pi1541_V1.25_Beta_F

I have fixed the broken browse mode commands (eg create new d64 image via OPEN 1,8,15,”N0:NEWIMAGE.D64,01”:CLOSE 1)

I have also improved timings again and added some options that also help refine the timings even more.

“DisableHDMI = 1” is a new option and it helps the timings by not using the Pi's HDMI screen. If you are using a Pi3/2 and don't use the HDMI screen then I suggest you turn this option on by editing your options.txt file and adding it.

As usual, please give it a try and let me know if you have any issues.

If you have the chance, knowledge, facility and are willing to do so, please test a variety of combinations of option A vs B, versions of the Pi, 1541 and 1581, with/without FB64, LCD, and anything else you can think of.

Note: I couldn't test the Pi2 version as my Pi2, after eight years of service, just decided to die.

If anyone is still having problems with JiffyDOS, please let me know. Also, here are some things you can try (any or all, listed in order of priority) options in your options.txt file;-

GraphIEC = 0

DisableHDMI = 1

SoundOnGPIO = 0

If that still doesn't work (and you are using a Pi3) you can try overclocking with a config.txt file that contains;-

// For Pi3 only!

kernel_address=0x1f00000

force_turbo=1

arm_freq=1300

over_voltage=5

gpu_freq=500

# sdram overclock

sdram_freq=588

sdram_schmoo=0x02000020

over_voltage_sdram_p=6

over_voltage_sdram_i=4

over_voltage_sdram_c=4

An update on other work I have been doing is that I have stripped back the Pi1541 code to its bare minimum and optimising it to run on a $2 RP2040 microcontroller (ie Pi Pico).

This has got me excited because my goal has always been to give the community cycle exact 1541 emulation for the cheapest price. This chip is way less powerful than the other Pis but it has programmable IO that enable the timings to be better controlled.

It can be powered by the 64 and this enables it to be possibly mounted inside the 64. It could be easily made into a cartridge and this got me thinking, I could possibly use another RP2040 to implement something like a KungFooFlash cartridge. With one RP2040 emulating the 1541 and the other emulating a cartridge, it would make quite a powerful retro device for only a few dollars in parts.

The 1541 emulation is not quite there yet but I'm very close to getting it working. I converted all to code to straight C and have been scrutinising all the code it is generating to check that the final result is the best performance. Then, hand coding functions in assembler where needed. I have split the code so one core runs the 6502 and the 6522's while the other core runs the drive mechanics, timers and shift registers.

Thank you all for your support and encouragement, I really appreciate it.

Sorry, it has taken so long for this update, as some of you know I have some ongoing health issues and I really thought I would hit a breakthrough with the Pi Pico version that I could have announced earlier. I am still working on the SuperCPU cart and sending off another spin of the PCB this week.

Take care, thanks and regards,

Steve

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