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by srowe
Sun Feb 25, 2018 2:14 am
Forum: Collecting and History
Topic: Cartridge identity?
Replies: 6
Views: 45

Re: Cartridge identity?

HAL Labs were of course responsible for a number of the earliest cartridges for the VIC https://en.wikipedia.org/wiki/HAL_Laboratory#Commodore_VIC-20 This doesn't seem to be one of the titles that are currently known, perhaps you have an unreleased one? I was going to open it but I have memories of ...
by srowe
Sat Feb 17, 2018 2:20 am
Forum: Emulation and Cross Development
Topic: Symbolic keyboard map for XVIC - Italian
Replies: 16
Views: 295

Re: Symbolic keyboard map for XVIC - Italian

Here's a better one from "VIC Revealed"

keymatrix.png
by srowe
Tue Feb 13, 2018 1:38 am
Forum: Hardware and Tech
Topic: how do i connect a vic 20 to a votrax type n talk?
Replies: 31
Views: 6988

Re: how do i connect a vic 20 to a votrax type n talk?

Try looping back Tx and Rx and checking you can receive what you send. This will confirm the VIA and the level shifter are working.
by srowe
Thu Feb 01, 2018 1:15 pm
Forum: Games
Topic: WIP: Manic Miner port
Replies: 78
Views: 2448

Re: WIP: Manic Miner port

This latest version starts in the Solar Power Generator...
by srowe
Mon Jan 29, 2018 12:44 pm
Forum: Hardware and Tech
Topic: Great price on LM323 VRegs for 2 Prong VIC
Replies: 10
Views: 170

Re: Great price on LM323 VRegs for 2 Prong VIC

Don't forget to log them in Giacomo's excellent VIC Registry

http://cbmvic.net/registry
by srowe
Sat Jan 27, 2018 8:10 am
Forum: Programming
Topic: cc65 and RS232 User Port Serial
Replies: 83
Views: 2375

Re: cc65 and RS232 User Port Serial

I am working on this when I have time. I've decided to rip out support for 2 stop bits, parity checking and anything other than 8 bits. This reduces the number of cycles spent in an interrupt and may mean it can support higher baud rates.
by srowe
Thu Jan 25, 2018 7:27 am
Forum: Collecting and History
Topic: More questions!
Replies: 15
Views: 334

Re: More questions!

Floopy wrote:#2: the C64 and the VIC-20 both run at 1.023Mhz?


No, it varies between system, see http://www.lemon64.com/forum/viewtopic.php?t=36751
by srowe
Fri Jan 19, 2018 1:12 am
Forum: Buy, Sell, and Trade
Topic: 6560-101
Replies: 6
Views: 231

Re: 6560-101

This was the seller I used https://www.aliexpress.com/item/6561-101-DIP40/32848404146.html?spm=2114.search0104.3.28.1c942c640vocdY&ws_ab_test=searchweb0_0,searchweb201602_5_10152_10151_10065_10344_10130_10068_10324_10547_10342_10325_10343_10340_10548_10341_10192_10190_10084_10083_10615_10307_103...
by srowe
Fri Jan 19, 2018 1:06 am
Forum: Hardware and Tech
Topic: Replacement Power Switch on a Two Pin Power Vic.
Replies: 1
Views: 49

Re: Replacement Power Switch on a Two Pin Power Vic.

Yes, it is. Do you have a picture?
by srowe
Thu Jan 18, 2018 2:25 pm
Forum: Hardware and Tech
Topic: Display issue
Replies: 34
Views: 622

Re: Display issue

norm8332 wrote:That said, it may be possible to mod the circuit for a better picture..I don't know if anyone has tried though.


I guess the S-Video mod would greatly improve it, but I don't have a TV with S-Video in.
by srowe
Thu Jan 18, 2018 2:23 pm
Forum: Hardware and Tech
Topic: Display issue
Replies: 34
Views: 622

Re: Display issue

Thanks, that does seem to be the case. It's a shame as the VIC display was so much better than many other machines of its time. It was reasonable to stop using sockets and replace 2114s with 2K RAM, I can't imagine they saved that much on a handful of resistors and capacitors in the video circuitry ...
by srowe
Wed Jan 17, 2018 2:32 pm
Forum: Hardware and Tech
Topic: Display issue
Replies: 34
Views: 622

Re: Display issue

Replacing the VIC resolves the majority of the problems on my CR test rig but the picture quality still seems inferior to my two pin system. Could someone summarize just what the circuit changes were to the CR and why they give a worse picture?
by srowe
Mon Jan 15, 2018 2:09 pm
Forum: Buy, Sell, and Trade
Topic: 6560-101
Replies: 6
Views: 231

Re: 6560-101

Radical Brad wrote:Thanks for the report.
What was your cost?


The equivalent of 50 USD for three chips.

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