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In addition to the 2600 & 7800, I have the desire to program the Vectrex. I grew up in the golden age of video games and vector games were part of the magic. The Vectrex also uses a 6809 - the processor I first programming in ASM.
In brief, the way the Vectrex draws vectors is:
1. Set the Y velocity
2. Set the X velocity
3. Turn on the beam
4. Turn on the integrators which change the X/Y velocity into X/Y position
5. Wait for timer to expire
6. Turn the integrators & beam off
7. Repeat
Back in the day for Atari this sequence was handled by a simple state machine which read a series of instructions stored by the main program. Years ago I thought it would be interesting to do something similar for the Vectrex by doing all of the movement via an interrupt routine which would return to the main program during step 5. Unfortunately, I've since learned the timer isn't for that many cycles so there's no point.
But I also came across an interviewwith Christopher Salomon, who worked on the original DOS Vectrex Emulator and created VFrogger. He pointed out the Vectrex is a dead machine. No matter how much people enjoy it, no more will ever be made. (Especially for the Vectrex with it's vector CRT.) We might play games via emulators, but that hardly recaptures the magic of a true vector display.
But it got me to thinking, I noted on another forum that games like Pac-Man are now over 30 years old, so the vast majority of machines which still exist are likely in private hands. Well the same could be said for old consoles. So why put a lot of effort into creating for somthing that's already dead?
'Cause it's cool, I guess. And current platforms just don't have the same level of to-the-metal programming which I enjoy.
And part of me still wants a Vectrex...
In brief, the way the Vectrex draws vectors is:
1. Set the Y velocity
2. Set the X velocity
3. Turn on the beam
4. Turn on the integrators which change the X/Y velocity into X/Y position
5. Wait for timer to expire
6. Turn the integrators & beam off
7. Repeat
Back in the day for Atari this sequence was handled by a simple state machine which read a series of instructions stored by the main program. Years ago I thought it would be interesting to do something similar for the Vectrex by doing all of the movement via an interrupt routine which would return to the main program during step 5. Unfortunately, I've since learned the timer isn't for that many cycles so there's no point.
But I also came across an interviewwith Christopher Salomon, who worked on the original DOS Vectrex Emulator and created VFrogger. He pointed out the Vectrex is a dead machine. No matter how much people enjoy it, no more will ever be made. (Especially for the Vectrex with it's vector CRT.) We might play games via emulators, but that hardly recaptures the magic of a true vector display.
But it got me to thinking, I noted on another forum that games like Pac-Man are now over 30 years old, so the vast majority of machines which still exist are likely in private hands. Well the same could be said for old consoles. So why put a lot of effort into creating for somthing that's already dead?
'Cause it's cool, I guess. And current platforms just don't have the same level of to-the-metal programming which I enjoy.
And part of me still wants a Vectrex...
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Me too. I've been planning to buy a Vectrex for awhile (okay... 30 years if I were honest). I even bought a VecMulti.