Denial

Hi

I tried to put together a pi1541, but it did not work with the Vic-20 (at least the one I tested it with). I haven't found that I did anything wrong.

Anyone else here had any luck with a pi1541 and Vic20?

Yes, I have one and have no issues with it.

I don't think true compatibility matters so much with the Vic as I don't know of any software that needs it.

I have one also and it works very well.

beamrider wrote:I don't think true compatibility matters so much with the Vic as I don't know of any software that needs it.

indeed, just a handful of demos.

The SD2IEC is more suitable for the VIC20 I think.

Several demos with custom fast loader and stand-alone drive speeders spring to my mind here:

o Veni, Vidi, VIC!,

o Robotic Liberation,

o Back in the Good Old Days,

o Ancient School,

o GNORK!,

o HYPRA SYSTEM.

These all won't work with a SD2IEC but should work with a Pi1541.

All the demos I own requiring true 1541 emulation:

unexpanded: >=8k:

@majikeyric: I'm not quite sure about the OMD ORB Megademo. When I compiled my smaller list, I could get it to run with VDrive in VICE, so that strongly indicates it should also run with a SD2IEC (but I will have to try out). (At least) Ancient School and Gnork! need +16K.

what is VDrive ?

majikeyric wrote:what is VDrive ?

True Drive Emulation OFF and Virtual device traps ON in VICE.

What then accesses disk images, or PC directories as mounted 'disks', is VICE VDrive:

Hello.

I too am curious if the pi1541 works with the vic20. I ordered a PCB kit from ebay and built my own. I can certainly post all the gory details, but will be brief here, curious if anyone has any suggestions for troubleshooting. I understand I should probably reach out on lemon64 as that is where most of the gurus hang out for this device including the developer.

The pcb I have is what they refer to as "option B". It has a built in level converter, and a separate driver chip for the IEC bus so that it can source/sink enough current to be in a daisy chain. I've checked power supply and wiring. All are in spec.

The "browse" mode works fine. I can save and load programs from my vic20. The "emulation" does not. I've tried both 1540 and 1541 roms. My $64 dollar question is: Can one assume if the browse mode works that the hardware is correct? This is the assumption I would make. I have a logic analyzer and I could record the signals if needed.

[update]
Here's an update after a great deal of struggling. It seems something has changed around the 1.20 pi1541 kernel version. 1.20 works, > 1.20 does not with the vic20. The 1540 rom doesn't work in any config that I've found.

FWIW, the 1.23 firmware release notes state compatiblity has been improved and now works on many more combinations of hardware including VIC20.

With the help of a lot of testers I was able to update the timings to a state where compatability is increased for all combinations of;-
A/B hardware set ups.
NTSC vs PAL
Pi0, 1, 3B, 3A and 3B+
C64, Vic20, Plus4, C128
1541 and 1581 modes

I'm hoping to build a PiZero based 1541 but haven't got there yet.

I have a breadbord based Pi1541 running an a Pi0 currently.
Working great.
I need to print my case and solder it up for a more permanent install.

I’ll add that my pi1541 that I built for my c64 works fine with my vic also.