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12

I had two micros when I was growing up: the SAM Coupé and the Acorn Electron. The SAM Coupé has a 512x192 mode much like you discuss. The SAM's display is physically wider than a Spectrum's though, pixels being approximately 1.25 times as wide as tall. The Acorn Electron inherits full 80-column 640x256 video from its progenitor, the BBC Micro. In both ...


10

Rather than convert the NES, just get a PAL monitor. The common auto backup video systems use an NTSC/PAL switchable monitor, available for not much money.Backup monitor 7" It is also possible, with some video capture cards, to select PAL (then your computer display will allow you to use the game). If your TV takes PAL input (some do: check all the ...


9

Yes, but only a very slightly different speed: the master crystal was around 14.238Mhz rather than 14.31818Mhz. which is only around 0.5% different, so I would expect safely within tolerance for a Disk II. Something PAL users didn't get from the base machine: colour. The relationship with phase is a lot more complicated in PAL, as that's how the error ...


9

You'll have to get a PAL to NTSC converter. A modification to make a PAL NES to output NTSC video would be extremely difficult because both the console and the games are designed for the video signal. The NES's clock frequencies were chosen to match the timing of the video signal, so you'd have to replace the clock circuitry. The PPU is hard-wired to ...


6

At startup, the Amiga used a timing routine to check the frequency of the AC power supply, and start in PAL (50 Hz AC) or NTSC (60 Hz AC) appropriately. Unfortunately, the detection was buggy, and sometimes 50 Hz was wrongly identified as 60. Many Europeans would have Declan McArdle's NoPALReset in their s:startup-sequence to avoid this. I think the problem ...


5

Z80 and 6502 are complete different CPUs in terms of clock and cycle structure. There is no sense in comparing them at this level. To solve your problem you need to focus only on your Z80 system, its instructions and their timing in relation to the video frame you want to create/manipulate. With 4 MHz each clock cycle is 250 ns. Using this on 50 Hz 625 ...


4

An unmodified Amiga 500 provides two outputs: analogue and digital RGB through its DB23M connector monochrome composite through its RCA connector Colour encoding is identical in both PAL and NTSC variants on the RGB output, and not present on the RCA connector, so the vast majority of screens with the corresponding inputs will work fine with either (they ...


4

I can think of several options: The hardest one (because it is still WIP) is to remove the PAL ULA and get a NTSC ULA. NTSC ULA's existed for some clones intended for the American market. Today they are very rare chips. However, there are some projects that aim to design a direct replacement ULA using programable logic. These projects may support NTSC ...


4

Simple answer: Yes, they all do (plus many US HDMI TVs accept 50 Hz anyway). But you may want to check if they are able to process PAL input, as there are some (usually older) who don't. Also, there are differences in their upscaling algorithms, so while this is no big issue for a movie it might be annoying on certain consoles/games. So it might help to ...


3

A working power supply and a completely black screen hints to a memory problem in the lower banks or an MMU contact problem (which is way more likely with the computer traveling that far). The ST sees no memory at all and won't even display a (white) picture. I would first carefully remove the MMU from its PLCC socket and thoroughly but carefully clean the ...


2

You're never going to convert a 50 FPS to 60 FPS (or vice-versa) and have the game run perfectly...the way the designers meant it to run. It's always going to run too fast (PAL running on NTSC) or too slow with lag (NTSC running on PAL). The problem is the conversion itself. Think of two metronomes starting at the same time. One runs at 50 FPS and the ...


2

The easiest and cheapest solution is probably a composite to HDMI adapter that supports PAL. But it will add about 2 frames of lag (search in that link for "HDV 8S" for the review), so fast-paced games may be a little more difficult to play. The best solution for digital displays is either an HDMI NES mod or an XRGB-Mini Framemeister, both of which are ...


2

I had a Timex TC 2048 (compatible with the ZX Spectrum 48k) with the text extended modes, never used them much. Granted, they were not supported by the ZX Spectrum ROM in the first place and the software to support them was not that widespread; however I got a tasword copy that supported those modes, and in my cheap B/W (PAL) TV the result was difficult to ...


2

So, I am using 220V/60Hz instead of the European standard of 220V/50Hz. Which should be fine for most. Especially the ones with switching PS. Further 220V is fine, as they are old machines from back when continental voltage was 220 (and Brits still used 240). My question mainly concerns the Atari. I am getting 5V and 12V from the PSU, but no video or ...


1

well I would use oscilloscope and look if: clock is running data and address buss is alive that can rule out CPU and MEMORY side problems. If working measure the modulator input/output if it produces signal. If yes the problem is either in cables or in the monitor itself. Otherwise you might have problem with graphics ICs. However take in mind I am not ...


1

If you checked output power of the power supply to be ok, then it is a problem of computer electronics. This Atari was reported to be working by the prior owner Do you think anyone would admit that? Problem may also happen during transportation. Anyway you need to find someone to take a closer look onto the boards and troubleshoot them. At first take a ...


1

I use a USD$35 generic "HD Video Converter SCART/HDMI to HDMI 720P/1080P" box (listed as "HDV 8S" on this page) which accepts composite through the SCART connector and supports both PAL and NTSC signals. Into that I've plugged a passive Composite-to-SCART adapter which also accepts L/R audio. This setup works with my French Amiga CD32. The XRGB-Mini scan ...


1

I highly recommend the XRGB-Mini (it's often called "framemeister") - got one for my Commodore's and it works flawlessly. I'm in Japan but all my computers are PAL versions (on purpose). The device is expensive, but if you start buying various adapters for a test you're likely to waste a lot of time and money anyway. If you're using a regular TV - any HDMI ...


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