1084s-D2 (analog only variant) - RGBI/TTL adapters?

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2mg
Posts: 74
Joined: Wed Jun 26, 2019 5:37 am

1084s-D2 (analog only variant) - RGBI/TTL adapters?

Post by 2mg »

This post also applies to getting C128 RGBI and MDA/CGA/EGA to work on CRT TVs.

I'm looking at 4 adapters to achieve this (I don't know if linking to shops is allowed, I'll just post names):
- CGA2RGBv2
- C128 RGBi to RGBa adapter
- CGA2SCART PRO
- MCE-adapter

However, none of these specify sync voltages, some don't mention the polarity, some don't mention sync type.

OTOH most seem to have XX khz in > XX khz out, and according to https://www.dosdays.co.uk/topics/15khz_monitors.php only CGA is 15khz (and I presume only in 320x200 mode?).

1084s-D2 (and P2 AFAIK) is a 15khz only analog monitor, and most common CRT TVs are too plus they don't usually expect TTL level sync.
I've read that GBS scalers also expect 3.3V sync as input.

I know there's a TTL mod for that monitor, but let's keep that for maybe later.

Does anyone have any experience with these, especially with "it fried mine", or should I look for something different?
PC Engine Fan X!
Posts: 9761
Joined: Wed Jan 26, 2005 10:32 pm

Re: 1084s-D2 (analog only variant) - RGBI/TTL adapters?

Post by PC Engine Fan X! »

Here's a Amiga 1080/1084 Scart to DB-9 interface adapter: https://www.ebay.com/itm/396976013354?_ ... R6jh46WOZw Seller will deliver to the USA from Italy via DHL shipping method only, so keep that in mind.

Yes, it's well-known that both the Amiga 1080 & 1084S RGB monitors are 15.7kHz based to begin with. I've seen the Amiga 1084S monitor with a DB-9 port and with others, a different RGB port (which looks like a DIN-9 pin port installed in place).

PC Engine Fan X! ^_~
2mg
Posts: 74
Joined: Wed Jun 26, 2019 5:37 am

Re: 1084s-D2 (analog only variant) - RGBI/TTL adapters?

Post by 2mg »

PC Engine Fan X! wrote: Wed Feb 18, 2026 8:10 pm Here's a Amiga 1080/1084 Scart to DB-9 interface adapter: https://www.ebay.com/itm/396976013354?_ ... R6jh46WOZw Seller will deliver to the USA from Italy via DHL shipping method only, so keep that in mind.

Yes, it's well-known that both the Amiga 1080 & 1084S RGB monitors are 15.7kHz based to begin with. I've seen the Amiga 1084S monitor with a DB-9 port and with others, a different RGB port (which looks like a DIN-9 pin port installed in place).

PC Engine Fan X! ^_~
Your link is for analog RGB inputs as I understand it.

Regarding different ports, here's a list of probably all of Commodore monitors - https://gona.mactar.hu/Commodore/monito ... umber.html

I don't really understand why the marketing around some of these, like 1084, is that they were compatible with computers of that time, since 1084 is 15khz only while MDA is 18khz, CGA can be 15khz but also 18khz, EGA goes up to 21khz, and then you have 1084s-D2 that lacks TTL/RGBI completely (I know about the mod, which I'm reluctant to do).
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