Search found 21 matches

by gmc
Fri Feb 17, 2023 10:02 am
Forum: General Topics
Topic: Certain games left shifted on screen
Replies: 3
Views: 477

Re: Certain games left shifted on screen

Thanks, didn't realise you could do that. It's fixed the issue on 3 of them :)
by gmc
Fri Feb 17, 2023 8:11 am
Forum: General Topics
Topic: Certain games left shifted on screen
Replies: 3
Views: 477

Certain games left shifted on screen

I've got a VIC-20 PAL Version connected to a LCD monitor via a RetroTink 2X Pro. This has been working well and have no issues using my VIC. I'm now trying to create a cart with a few 8k games on which is selectable via dip switches. I'm noticing a few games are left shifted off the screen. Most of ...
by gmc
Tue May 12, 2020 12:25 pm
Forum: Hardware and Tech
Topic: Faulty RAM - interpreting diag cart.
Replies: 10
Views: 883

Re: Faulty RAM - interpreting diag cart.

Code is here, hopefully I'll get to finish it off sometime https://eden.mose.org.uk/gitweb/?p=dead-test.git;a=summary After tinkering around for a few days and pulling my hair out, I finally wrapped my head around most of the code. Still some of it is over my head but I managed to cobble together s...
by gmc
Mon May 11, 2020 9:26 am
Forum: Programming
Topic: Simple assembly program issues
Replies: 2
Views: 311

Re: Simple assembly program issues

Lovely stuff. That did the trick.

Thanks for the quick reply. Didn't even occur to me to init this space...or that VICE sets it to all 0.

I've got a pal/ntsc routine. First thing I found out how to do. Just excluded it in case it was the cause of the issue. :)
by gmc
Mon May 11, 2020 8:49 am
Forum: Programming
Topic: Simple assembly program issues
Replies: 2
Views: 311

Simple assembly program issues

Trying my hand at some assembly for the Vic 20 and so far I thought it was going ok but have run into a strange issue. I've got a simple program that prints out TEST on the upper left. This runs from a cartridge at A000 and I've been testing it using VICE. The weird thing is it loads fine in VICE, a...
by gmc
Mon May 04, 2020 10:33 am
Forum: Hardware and Tech
Topic: Faulty RAM - interpreting diag cart.
Replies: 10
Views: 883

Re: Faulty RAM - interpreting diag cart.

Lovely. Thanks very much.

I've started tinkering around with Visual Studio Code and ACME + VICE. Boy have I forgotten a lot of asm in the last 30 years :)

Will let you know if I make any useful changes to the code.
by gmc
Sun May 03, 2020 10:03 am
Forum: Emulation and Cross Development
Topic: VICE. Unable to get IEC working with xvic
Replies: 10
Views: 1009

Re: VICE. Unable to get IEC working with xvic

Yessss!!! That did it. Thanks a million.

I must have had I enabled for the C64 but not the Vic.
Now enabled and works as expected with:

TDE disabled
Drive type: 1541
IEC (OpenCBM) disabled
Device type: File system
by gmc
Sun May 03, 2020 9:40 am
Forum: Emulation and Cross Development
Topic: VICE. Unable to get IEC working with xvic
Replies: 10
Views: 1009

Re: VICE. Unable to get IEC working with xvic

Thanks for the explanation. I clearly have no idea how it works :) With TDE it seems to ignore this setting so I thought as it was enabled on the C64 and it worked, then it was needed. So now this is really driving me mental. It just refuses to work for the Vic 20. I've run some comparisons between ...
by gmc
Sun May 03, 2020 3:32 am
Forum: Emulation and Cross Development
Topic: VICE. Unable to get IEC working with xvic
Replies: 10
Views: 1009

Re: VICE. Unable to get IEC working with xvic

i'm trying to load/save programs using IEC (OpenCBM), not a physical disk.

With dos1540 selected and IEC ticked I can list, load, save files on the local file system using x64 for the C64.

This does not work for the Vic 20 so I'm unable to load/save files locally.
by gmc
Sat May 02, 2020 11:20 pm
Forum: Emulation and Cross Development
Topic: VICE. Unable to get IEC working with xvic
Replies: 10
Views: 1009

VICE. Unable to get IEC working with xvic

Just started messing around with VICE 3.4 on Ubuntu as I want to start leaning assembly again. Installed VICE and ROM files as well as dos1541. The runn xvic and setup the drive - Select cbm 1541 - True drive emulation - IEC After that if I run load"$",8 I get: searching for $ ?file not fo...
by gmc
Sat May 02, 2020 1:28 pm
Forum: Hardware and Tech
Topic: Faulty RAM - interpreting diag cart.
Replies: 10
Views: 883

Re: Faulty RAM - interpreting diag cart.

I'm running this from a cartridge with no memory expansion. Results are repeatable to looks like UE4 is the issue then.

At least this narrows it down. I'll replace UE4 and see what happens.

Let m know if you publish to git or something.

Thanks again.
by gmc
Sat May 02, 2020 10:21 am
Forum: Hardware and Tech
Topic: Faulty RAM - interpreting diag cart.
Replies: 10
Views: 883

Re: Faulty RAM - interpreting diag cart.

srowe wrote: Sat May 02, 2020 12:23 am Here's the current version, it should be able to identify which RAM chip is faulty, there's no text yet so post a picture of the screen if/when it fails.
Pic attached. Lots of red :)

Great utility. Its not open source by any chance? Would love to see how it works.
by gmc
Sat May 02, 2020 7:28 am
Forum: Hardware and Tech
Topic: Faulty RAM - interpreting diag cart.
Replies: 10
Views: 883

Re: Faulty RAM - interpreting diag cart.

Awesome. Will give this a shot and let you know.

Thanks, Mike - very useful info.
by gmc
Fri May 01, 2020 2:46 pm
Forum: Hardware and Tech
Topic: Faulty RAM - interpreting diag cart.
Replies: 10
Views: 883

Faulty RAM - interpreting diag cart.

I bought a faulty VIC20 (324003) off eBay that's had a hard life. Replaced the kernal and char rom's with 27c64's with a conversion board which brought it back to life. At least its now booting up and screen looks fine. Amazingly the VIC and CPU are fine, it starts up and see's 3583 bytes. When I ru...
by gmc
Fri Jan 04, 2019 1:49 pm
Forum: Hardware and Tech
Topic: Building Ruud's 35k RAM expansion
Replies: 7
Views: 5987

Re: Building Ruud's 35k RAM expansion

Cool, will give it a bash.

Can now start messing around with my Vic. Bringing back memories from 30 years ago typing in pages and pages of code from magazines :mrgreen: