VOGONS


First post, by SquallStrife

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So I spent Saturday afternoon building a switchbox for my two old-world Macs.

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I used the enclosure of a faulty GameTheater XP breakout box. Two 6-pole 2-position rotary switches, and some of my leftover VGA cable. I used two separate switches, because once you go above 6 poles, the switches start getting expensive. It works quite well, the image is very bright and sharp, and ghosting only starts to occur above 1024x768.

There is a minor issue with the monitor sense functionality. I tied together the sense pins of both inputs, due to not having enough free pins on the rotary switch, but this seems to interfere with the way the sense works, because when both systems are connected, they will only display at 1152x870. If I unplug the monitor lead from one of the systems, the other will function correctly, and allow me to choose resolutions (as per the DIP switch settings on the adaptor). So perhaps a third switch is required. Eep.

The other little mod I did was to add a much-needed power switch to my ZX Spectrum+. Just for fun, I used an illuminated switch. It's pretty cool!

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The barrell connector on the Speccy motherboard is linked to the rest of the system on both sides of the PCB, so I had to remove the connector, cut the traces, and reconnect it. Once that was done, a few wires and bam. A Speccy with an on/off switch AND a rest button! 😀

The last thing wasn't really a "mod" as such, but I used some leftover shelving to build an alcove for my Amiga A1200 to live under my 1084S. This allows me to share the 1084S with the 4 systems it supports, in a space-effective way.

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Reply 1 of 9, by Hatta

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Very productive weekend I see. I like the shelf for your Amiga. I have a factory made one with a shelf on rollers for my Amiga 500. I never thought about putting a Tandy underneath my 1084, but I guess the TTL RGB should be compatible with CGA/TGA. I'd consider doing that, but my TX is quite a bit taller than your RL. Might be precarious. Plus, I have a CM-11 for it I should use it.

A 128d would be the ideal computer to put beneath a 1084.

Reply 2 of 9, by TELVM

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Is that a Spectrum 48K + ? Legendary machine, I still keep mine in a closet 😊 .

Let the air flow!

Reply 3 of 9, by kao

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I never thought about putting a Tandy underneath my 1084, but I guess the TTL RGB should be compatible with CGA/TGA.

It is, the only little caveat being that the 1084 doesn't have the extra circuitry to convert color 6 (dark yellow) to brown.

Disclaimer: if you're in Europe, this won't work because PAL Commodore monitors run at 50Hz and can't digest the CGA/Tandy 60Hz refresh. Some people have reported over the years that they couldn't get IBM 5153 monitors to work on C128s without the picture rolling uncontrollably, and this was because they tried to use them on PAL models.

Reply 4 of 9, by SquallStrife

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kao wrote:

Disclaimer: if you're in Europe, this won't work because PAL Commodore monitors run at 50Hz and can't digest the CGA/Tandy 60Hz refresh.

<-- is in Australia.

😀

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Reply 6 of 9, by Hatta

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What's the 4th system you have connected to the 1084? I see Amiga, Tandy, and IIgs, but you said there were 4.

Reply 7 of 9, by SquallStrife

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Hatta wrote:

What's the 4th system you have connected to the 1084? I see Amiga, Tandy, and IIgs, but you said there were 4.

ZX Spectrum+

It's black, so it's easy to miss, but it's under the shelf, to the right of where the Amiga lives. 😀

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Reply 8 of 9, by filipetolhuizen

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I have this exact keyboard plugged in my modded G3 B&W along with a PowerComputing Mouse.

Reply 9 of 9, by SquallStrife

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I found this page:

http://kmt.hku.nl/~pieter/HARD/MON/MON.html

Which details how to configure the sense pins to simulate various Apple monitors. I added the diode to the RGB plugs for each system, and they now allow me to change resolutions. Wooties!

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