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MrPix

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Everything posted by MrPix

  1. To be fair, while it does filter out transient spikes, it doesn't filter out changes in level of say 11.8 to 12V... Personally, I'd be looking at if moving the power supply and video cable relative to each other changes the nature of the interference. Hearing the console was extensively recapped a couple of years ago is reassuring. If you used a ColUSB,do you still have it? If so, does the problem go away when you use it?
  2. Nice little board. Love the blacktopped 8910
  3. The CV system was designed for use with transformer-based power supplies with linear regulators, These pass through very little noise and what nise does pass through is generally of very low frequency. Modern switch mode power supplies use high speed switching at typically between 400 KHz to 1 MHz, and the Mean Well supply is no different. In the supply in question, the 5V line is loaded enough to work well, but the 12V line is very lightly loaded. This results in some unfiltered switching noise passing through on the 12V line. The Mean Well PSUs have adequate bulk electrolytic capacitors on the outputs, but these are just to handle consumption surges and do not work well to filter out high frequency switching noise. The CV consoles being in their late 30s doesn't help - many will work one way and a few will work another just because of variations in the aging of the caps. It seems likely the console in question needs a re-cap, and the recap needs to focus on the smaller caps as these are the ones that filter the higher frequency noise. Also, adding some 1uF and .1uF caps near the video section will do a lot to filter out the type of noise that's being imposed on the video signal in some consoles.
  4. You and me both. I have three separate shipments that might be in the back of the same truck, based on the tracking.
  5. He told me he was going to make the F18A mk1 open hardware a short while after releasing the mk2. If he follows through with that I’ll happily produce a batch.
  6. And on my end, I'm just waiting for that confirmation before ordering the PCBs. I have ordered the components and they've started dribbling in from all over the world. I have three packages stuck in Arizona since the 11th that are components for this. Fun times!
  7. I think so too. As a hardware maker, the part that excites me is the PCB layout and the assembly. I'm not really a salesman, though. I'd rather pair up with somebody who could do the customer-facing stuff. I suspect a lot of people would need help to desolder and transfer the VDP, so I was thinking of pairing up with someone like Ruggers Customs for that.
  8. I'm a hardware guy. One of my Mad Skills™ is address decoding with aliases. I can alias the VDP using a bridge so it can be at one location in one machine and another in the other. This way, I can remap everything, and just disable the internal CPU. From there, it's just a matter of making the CV/Adam think there's a cart in the built in slot, when an MSX cart is in the expansion slot.
  9. I have got an Inty project on the go, to produce clean RGB output from the AY-3-8915. All I can say is that, and I'm quoting myself, "It's like someone designed a console because they really wanted a console, but they didn't know what one looked like and had never seen one." The GI chipset is a festering abomination of bad ideas, for the main part. It works, but only with itself. Fortunately, the 8915 is the simplest IC, and I can work with the signals sent to it by the STIC (which in the Inty is a sort of proto-VDP/memory manager/bus supervisor, a job it shares with the RAM, which is also not just RAM but has other complex functionality too). I'd be more inclined to incorporate MSX functionality.
  10. My feelings exactly. And there's a LOT of overlap with the Adam's top board. Mostly, using semi-modern SRAM for the main memory and VDP memory reduces power draw a lot, and adding in competent RGB and S-Video/composite from there gives much cleaner results than the original system. I opted to just put 32K in them because it is cheaper than smaller SRAMs. I debated putting an 8910 on there but I only have a few known genuine parts left, and everything on the market seems to be blacktopped/remarked or relabeled YM devices. The Adam's lower board is a lot more extensive than the SGM, adding memory, Adamlink, internal expansion of an extremely frustrating design, and quite extensive paging and memory selection hardware to pick between multiple boot ROMs and memory configurations. It's a genuinely schizophrenic design.
  11. Hardly. I haven't 'just shown up', and I can do what I want. In the next few weeks I'm releasing a TMS-RGB board, which gives RGB to CV and Adam (and any 9928-based machine). It's quite superior to the citrus3000psi RGB board and others, and works in a completely new way. It'll give accurate colors, and works with NTSC and PAL systems. I'm currently working on a CV clone - not an FPGA implementation, but a direct board replacement that has modern power regulation, and part of the SGM capability built in (the larger RAM and more granular address decoding). It has the RGB circuit directly built in, and would be used for repairing dead CVs where the motherboard is beyond economic repair. It only requires a donor 9928 or F18A. I released my first expansion in 1984, released the very first 512K expansion with battery backed clock for the Amiga, the Sam Coupe breathed its first breath of life on my bench. I was one of the designers of the translate lookaside buffer on the first ARM with cache. I'm not here to throw out "I've been doing this longer than you." I respect what you've managed to do with somewhat limited resources. I literally just said I have no plans to make an SGM. I don't compete with existing traders. I work to improve the hobbyist scene, not compete with people and harm their livelihoods. But way to assume, dude.
  12. I have a couple of reels of 32K SRAMs and 144x genuine AY-3-8910 on hand. I know where the sound chip is mapped and already have that working since learning the IO addresses yesterday. That said, the only way I'd release something in direct competition with an existing actively supported product in the market is if I feel the seller is price-gouging or making an inferior product. I don't have any incentive to make an SGM. Anyhow, I have better ideas that make the SGM look like a toy
  13. I think this is a nice bit of FUD. I almost want to make a clone just to run all the games. I would even guarantee it.
  14. Oh wow, I am so divorced from the origins of this thread, and have done the exact thing I was complaining about. Reminds me of the defining moment when the power shifted in my marriage: Her cat: Isis Me: "What a stupid name of a cat. Who names a cat something with two S sounds in it?" Her: "What, like Sassy?" My cat: Sassy Sorry Retro_Game_Lover, and go right ahead
  15. Interested, and will do the kindle version when it is released. I make carts for the CV/Adam, and have a couple of new ideas that would allow extended game play. I hope it'll be approachable
  16. I just want to remind people that this is a TMS-RGB development thread, not a citrus3000psi RGB tech support thread.
  17. Noted, and thank you. I'm going to go quiet on this project for a little while. I have a console on the way, and a lot of other projects and work that are reaching the last stretch - I'd really like to close some things out and do some tidying up before diving into that console and this project any deeper. I'll pop up like a funky smell from that plate you pushed under the sofa in a couple of weeks.
  18. Yes. It gives this correction on the PCB order site too.
  19. The CV and Adam have a 9928.
  20. Announcing the CGM1, the "Cute Game Module" - an AY-3-8910 for the Adam. Hehehehe But yes. As game cartridges were written targeting specific CPUs, memory maps, and VDPs, they would work across many systems with minimal rework if they did not require resources or functions provided by the BIOS on some systems. Typically, this means the cartridge booted and used its own IO routines. A game could work on almost any Z80A system just by altering the IO routines and screen handling.
  21. That thing where someone seeks technical support from the competitor to the product they actually bought, and gets it anyway
  22. I’ll look at this tomorrow and see if it will speed things up. Any additional info helps as the datasheet is a bit lean. The logic is straightforward, but the way the outputs are used to generate NTSC is, to be kind, obtuse. I understand it after other projects, but still, recreating it in a color system like RGB that has a smaller color gamut, never an ideal situation. I’ll do the best I can and most people will hopefully be happy. So many shades of green!
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