Denial

carlsson wrote:...ps: Is a VIC-20 console more difficult to find than a RAM expansion?

I can confirm to you that RAM expansions are still under production. Sadly, VIC-20s are not.

Abra = CACA !! They had nothing left in stock!!

Historical multicart Schematics update 1.3

HERE

And already there is a bug found in it. The address line going into gate U3F should be A9 instead of A3 to prevent such games as Q-Bert from writing invalid values to the BLK 1-3 access latch.

Still waiting for an updated schematic for the reset system from 6502dude Here is a picture of the front end of my reset system (I posted this over 2 months ago in this thread). That seems to be good when a reset is triggered with a positive pulse with no timing delay constraint. Since your design ...

I respectfully disagree. An "in the box" thinker has a physiological construct, which sees the utility or function of a "widget" limited to its current use or purpose. He/she never envisions how this "widget" may be used in another manner that it was originally intende...

Note that these were produced by Commodore Canada and released here only. I have several but no extras unfortunately. They are nicely packaged. Active Surplus in Toronto used to have a very large cardboard box (stove sized) full of loose casettes from these books in the middle of their store (this ...

6502dude wrote:... your design can not.

Fix implemented...

I have implemented changes to schematic V1.2. The data latch access can only be done with a write and only if address line 3 is high, thereby excluding the first seven bytes of IO2 and IO3 memory range as accessible for the latches. This was done with Diode-Resistor logic. Still waiting for an updat...

Reset lacked RC time constant. This could have been done with pulse from 74LS121, or a 555 timer. My design opted for simple pulse controlled by RC time constant which fit nicely in with hardware switch debounce. Isn't this what I specifically asked you to fix in my design? Using entire /BLK2 &...

Reset lacked RC time constant. This could have been done with pulse from 74LS121, or a 555 timer. My design opted for simple pulse controlled by RC time constant which fit nicely in with hardware switch debounce. Isn't this what I specifically asked you to fix in my design? Using entire /BLK2 &...

This was good a good diagram, largely based on Schema's drawing. Unfortunately, most of the rest of it simply didn't work. I know because of some of my background from the 80's and from actually testing ver 1.2 concept. Prove it! I think it works perfectly well but... you don't understand how it wo...

Sorry, but your design had a few flaws and was not functional. Well, would you be so kind as to tell me WHAT flaws it has? The only questionnable component was the automatic reset system and I did ask you to come up with a better solution and you never did. All you said was "I like KISS, keep ...

Third post... I know, I had a lot on my heart about this project... My philosophy is to have an open mind and embrace change. Instead of "no", I like to think "why not?" There would be little inovation in the world if we don't "think out side the box" once in a while. G...

How would you do that? A VIC-20 has one cartridge slot and all the RAM expanders I've seen plug into that cartridge slot. If you've got a RAM expander plugged into the cartridge slot, how do you go about plugging in a Programmer's Aid cartridge at the same time? There's no need to worry about compa...

I LOVE YOU Jeff!!! :lol: :lol: :lol: Also, we have a problems with Scott Adams games which will not run fine if there is any RAM in block 1. What is the problem? I have found none. You didn't dig very deep buddy... Taken from the web site for the instructions of the ultimate expander, written by Ala...