PCL

Maria knows from the second byte in the header. If bits 0..4 are all 0, it's either a 5-byte header or a display list terminator. Otherwise, if any of bits 0..4 are set it's a 4-byte header.
Funnily enough I'm thinking about going the other way. Everything I've done on the 7800 so far has been in assembler and I'm pondering giving 7800basic a try.

Maria knows from the second byte in the header. If bits 0..4 are all 0, it's either a 5-byte header or a display list terminator. Otherwise, if any of bits 0..4 are set it's a 4-byte header.
Funnily enough I'm thinking about going the other way. Everything I've done on the 7800 so far has been in assembler and I'm pondering giving 7800basic a try.

Yes, unfortunately it does. Every time Maria reads a byte of graphics data Sally is halted. So the more graphics you display, effectively the slower Sally gets. It is the same with the 5200/8-bit computers, but potentially worse on the 7800 since Maria can display a lot more graphic objects than ANTIC/GTIA.
In the worst case, if you drive Maria to its maximum then essentially Sally does not run at all. There are 262 scanlines per NTSC frame (not all visible), so with a 224 scanline display and a maxed out Maria, Sally only runs during the 38 non-display scanlines effectively reducing the 1.79MHz clock rate to 0.26MHz.
Of course you don't normally max out Maria but the more graphics you see on screen, the less time there is for code to run.

I added 2 button support, so it should be playable with the Turbo 2000 in 7800 mode plus a few logic changes for when the hearts/diamonds appear and how long the Drebish Windows stay in place, to closer match the A8 original.
drelbs.a78

I added 2 button support, so it should be playable with the Turbo 2000 in 7800 mode plus a few logic changes for when the hearts/diamonds appear and how long the Drebish Windows stay in place, to closer match the A8 original.
drelbs.a78

I added 2 button support, so it should be playable with the Turbo 2000 in 7800 mode plus a few logic changes for when the hearts/diamonds appear and how long the Drebish Windows stay in place, to closer match the A8 original.
drelbs.a78

This is a 7800 remake of one of my favourite A8 games. It is a 32K ROM with pokey@4000 (the same as Ballblazer) and seems to run OK on everything I've tested (Concerto/DF/A7800/BupSystem/JS7800/ProSystem).
For anyone unfamiliar with the game there are instructions here: https://archive.org/details/drelbs-synapse
As a remake the logic may not be 100% identical to the original but I think I have all the key aspects covered.
drelbs.a78

I use the Turbo 2000 wireless pads. OK, thats can be the problem...this evening I will test my europad

Yes, its a controller problem. The game works fine with any other (wired) controllers. Thank you very much for the game!!

Thank you
 
It doesn't work on my PAL console with the DF, see only the title-screen and can not start the game, but its look great

I can respect that. Really isn't much reason for physical releases these days.  If you ever change your mind I can get you in touch with somebody who could handle all the production.  
I played quite a bit yesterday and it seems solid.  I'm not sure what the point of the princess is. Just bonus points?  I got myself stuck once and was gonna point it out but the dragon came and freed me pretty quickly. Overall it's very challenging and fun. Programming seems very solid. 

This is a 7800 remake of one of my favourite A8 games. It is a 32K ROM with pokey@4000 (the same as Ballblazer) and seems to run OK on everything I've tested (Concerto/DF/A7800/BupSystem/JS7800/ProSystem).
For anyone unfamiliar with the game there are instructions here: https://archive.org/details/drelbs-synapse
As a remake the logic may not be 100% identical to the original but I think I have all the key aspects covered.
drelbs.a78

This is a 7800 remake of one of my favourite A8 games. It is a 32K ROM with pokey@4000 (the same as Ballblazer) and seems to run OK on everything I've tested (Concerto/DF/A7800/BupSystem/JS7800/ProSystem).
For anyone unfamiliar with the game there are instructions here: https://archive.org/details/drelbs-synapse
As a remake the logic may not be 100% identical to the original but I think I have all the key aspects covered.
drelbs.a78

Yes, please let me know if you see any issues. I've tried to keep it as close as possible to the A8 original while trying to take advantage of the 7800's improved graphic capabilities.
I'm not really one for releasing on cart as it's not my IP and adds more responsibility to a hobby. With Concerto, Dragonfly and the forthcoming GD there's plenty of ways to play it on real h/w.

This is a 7800 remake of one of my favourite A8 games. It is a 32K ROM with pokey@4000 (the same as Ballblazer) and seems to run OK on everything I've tested (Concerto/DF/A7800/BupSystem/JS7800/ProSystem).
For anyone unfamiliar with the game there are instructions here: https://archive.org/details/drelbs-synapse
As a remake the logic may not be 100% identical to the original but I think I have all the key aspects covered.
drelbs.a78

This game is awesome!  It needs to be on a cart. Good job. If I encounter any issues I'll update this post. 

Awesome!

Neat!  I will give it a try later!  Thank you.

Very cool.  Thank you.

This is a 7800 remake of one of my favourite A8 games. It is a 32K ROM with pokey@4000 (the same as Ballblazer) and seems to run OK on everything I've tested (Concerto/DF/A7800/BupSystem/JS7800/ProSystem).
For anyone unfamiliar with the game there are instructions here: https://archive.org/details/drelbs-synapse
As a remake the logic may not be 100% identical to the original but I think I have all the key aspects covered.
drelbs.a78

This is a 7800 remake of one of my favourite A8 games. It is a 32K ROM with pokey@4000 (the same as Ballblazer) and seems to run OK on everything I've tested (Concerto/DF/A7800/BupSystem/JS7800/ProSystem).
For anyone unfamiliar with the game there are instructions here: https://archive.org/details/drelbs-synapse
As a remake the logic may not be 100% identical to the original but I think I have all the key aspects covered.
drelbs.a78

This is a 7800 remake of one of my favourite A8 games. It is a 32K ROM with pokey@4000 (the same as Ballblazer) and seems to run OK on everything I've tested (Concerto/DF/A7800/BupSystem/JS7800/ProSystem).
For anyone unfamiliar with the game there are instructions here: https://archive.org/details/drelbs-synapse
As a remake the logic may not be 100% identical to the original but I think I have all the key aspects covered.
drelbs.a78