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#1
Quote from: Dmanu78 on 16:47, 06 July 25@andycadley : I'm very curious about your test code. Don't hesitate to let me know if you notice any differences. This will help me improve the emulation.It doesn't seem to like my scan line doubling code:
GX4000 scan line doubling
Haven't really dug into why though. My poor old laptop struggles running the emulation, so it might be time to think about getting a new one.
#2
If it's as good as it says, the price point is nice. But somehow I doubt this will go down well...
#3
#4
Price drop
Was €240
Is €220
Open to offers, DM me if you have one
Was €240
Is €220
Open to offers, DM me if you have one
#5
The SuperFX logic afaik was also that the chip is doing everything and the frame content is then copied to the SNES' video RAM.
Pretty similar what could be done here. The GX4000s/Plus' main purpose would be to copy the screen/sound content from (pseudo) ROM to the 64K base RAM and send back the joystick signals to the Pico (using pseudo reads to special addresses). The Pico would run the game, render the video/sound in the right format in its own RAM and make that RAM available as a ROM slot which can be read by the GX4000.
So framerate will be close to the maximum speed the Z80 can copy a 12-24K (depending on resolution) memory block from A to B.
Honestly I don't think that could be called "it runs DOOM" but at the same time I would be fascinated by a solution that properly renders the screens and sound in a way that it looks and feelds good on a Plus/GX4000.
Pretty similar what could be done here. The GX4000s/Plus' main purpose would be to copy the screen/sound content from (pseudo) ROM to the 64K base RAM and send back the joystick signals to the Pico (using pseudo reads to special addresses). The Pico would run the game, render the video/sound in the right format in its own RAM and make that RAM available as a ROM slot which can be read by the GX4000.
So framerate will be close to the maximum speed the Z80 can copy a 12-24K (depending on resolution) memory block from A to B.
Honestly I don't think that could be called "it runs DOOM" but at the same time I would be fascinated by a solution that properly renders the screens and sound in a way that it looks and feelds good on a Plus/GX4000.
#6
Quote from: genesis8 on Yesterday at 12:15The difficulty I suppose, would the cartridge with a 2350 have enough electricity to work, without endangering a CPC (with the Plus2CPC or Play2CPC), GX4000 or CPC+ alimentation ?
the difficulty is the memory video is only in the first 64k so the maximum framerate will depend on the screen size, and will be "low" in almost all cases
#7
Quote from: arnoldemu on Yesterday at 13:25There are problems:" simply " do it with expansion port
- the cartridge doesn't have a write signal
- the cartridge doesn't have access to z80 signals for I/O
therefore very limited by communications with the cart and any communication operations would need to be done by reading from various rom addresses.
It may be possible to be creative and run a pi on the board and the software runs on the pi AND this pi has a video output.
What would be possible is to attach the PI to expansion of the Amstrad with the software on the cart but then this would not work on GX4000 but would work on CPC and Plus.
#8
S
Technical support - Hardware related / Re: CPC 464 doesn’t boot, show...
Last post by salvogendut - Today at 13:44Quote from: hatman72 on Today at 11:20I do not own an M4 but I do own a ULIfAC and tried using it to debug this and that did not help for me. Maybe it has to do with the fact that whatever booted the ULIfAC tried to access RAM (even when I used a CONFIG.TXT with just the diagnostic ROM) where this one cartridge does notQuote from: salvogendut on Today at 09:42Hi, I am no expert but had recently a similar problem. What really helped me to debug the 464 was the cartridge you see in the pic. I got it off EbayI have an M4 card, so installed the diagnostics ROM on that. Unfortunately it doesn't boot from that either
#9
Technical support - Hardware related / Re: CPC 464 doesn’t boot, show...
Last post by Rabs - Today at 13:13Maybe this video may help
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In this video there is a similar screen pattern, sometimes, but also the usual grey screen black border RAM problem display.
You cannot view this attachment.
In this GadgetUK finds that IC112 74LS32 Quad OR is faulty. Not quite sure how the floating output he finds relates to the issue as pin 11 selects the printer latch but pin 8 does select the data latch (by the way I made pin 8 float on my test board and I get the usual grey screen RAM problem symptoms).
No idea if this is the same as your problem but saw it and thought I would share.
.
In this video there is a similar screen pattern, sometimes, but also the usual grey screen black border RAM problem display.
You cannot view this attachment.
In this GadgetUK finds that IC112 74LS32 Quad OR is faulty. Not quite sure how the floating output he finds relates to the issue as pin 11 selects the printer latch but pin 8 does select the data latch (by the way I made pin 8 float on my test board and I get the usual grey screen RAM problem symptoms).
No idea if this is the same as your problem but saw it and thought I would share.
#10
If I got this correctly the CPC would mainly have the function of a PSU? (+joystick)
(+joystick)