repetto74 Posted September 11, 2017 Share Posted September 11, 2017 Hi to all, I am an happy owner of a PAL TI99/4A since today (I am located in Europe) :-). The machine comes with the RF antenna cable with the big RF PAL modulator and the 6 pin DIN video socket output. I can test this with an old CRT TV I still have but I would like to know what are the best video modding options available to increase video output? Composite, S-video? Any tutorial? Besides that are there also hardware mods available to increase total memory or to improve the machine performance in general? Sorry I am really a noob with the TI99/4A so trying to sum up what is possible to do. Consider that I do have soldering and basic electronic skills + all tools required for the job :-) Many thanks, Rick 1 Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted September 11, 2017 Share Posted September 11, 2017 Is that the scart adapter? If so you can use that with hdmi with a cheap box.. if not, the best option is the f18a which is detailed in the "new to the group" faq pinned to the top of the forum Greg Quote Link to comment Share on other sites More sharing options...
Sinphaltimus Posted September 11, 2017 Share Posted September 11, 2017 Also this - --->>>http://atariage.com/forums/topic/267055-new-to-the-group-ti-994a-faq-hardware-and-software-resources-read-first/will help you find 90% of the things you maybe looking at or wanting to know about your *NEW* old computer. And welcome. 1 Quote Link to comment Share on other sites More sharing options...
repetto74 Posted September 11, 2017 Author Share Posted September 11, 2017 Hi Arcadeshopper, Nope the RF modulator is not the one with the SCART (PERITEL) output for the french market. I got this from an italian e-bayer and the modulator has been manufactured in Italy also but will need a TV antenna input. To Sinphaltimus : thanks for the greetings and will read closely the thread :-) Quote Link to comment Share on other sites More sharing options...
ti99iuc Posted September 11, 2017 Share Posted September 11, 2017 (edited) Hi to all, I am an happy owner of a PAL TI99/4A since today (I am located in Europe) :-). The machine comes with the RF antenna cable with the big RF PAL modulator and the 6 pin DIN video socket output. I can test this with an old CRT TV I still have but I would like to know what are the best video modding options available to increase video output? Composite, S-video? Any tutorial? Besides that are there also hardware mods available to increase total memory or to improve the machine performance in general? Sorry I am really a noob with the TI99/4A so trying to sum up what is possible to do. Consider that I do have soldering and basic electronic skills + all tools required for the job :-) Many thanks, Rick Hello Rick on the Italian User Club website you can read some guides/tutorials for a mod to the PHA 2036/2030 Check out at this link if it can help http://www.ti99iuc.it/web/index.php?pageid=119&pagina=mod_proj1&sezione=4&data=Mod_and_Tuneed Edited September 11, 2017 by ti99iuc Quote Link to comment Share on other sites More sharing options...
Stuart Posted September 11, 2017 Share Posted September 11, 2017 Best video mod is to fit an F18A to give a VGA output as Greg said above. But if you wanted to stay 'old school' and you have the version of the PAL modulator in a metal case (as opposed to the one in the plastic case), it is possible to get a composite video feed out of it. The attached scan (in German) shows you the basics but you will probably have to do a bit of fiddling to find the right connection points and so on. Instead of fitting a DIN connector as shown, I fed a coaxial cable direct into the case and connected it direct to output of the little video amplifier circuit. 1 Quote Link to comment Share on other sites More sharing options...
repetto74 Posted September 12, 2017 Author Share Posted September 12, 2017 Hi Stuart Thanks a lot for the schematic. Actually I have various working 8bit machines I would like to output to the same HD TV and with the best option possible. Wherever an S-video mod was possible it was done (Atari XL, VIC-20), composite is the second option when S-video is not possible (ZX Spectrum). The C64 and the Spectrum 128k are respectively S-video and RGB native. I am using a video upscaler AV/S-Video to HDMI which gives a really nice conversion to the HDMI TV. A composite mod to the TI99/4A will be a very good result then :-) Quote Link to comment Share on other sites More sharing options...
apersson850 Posted September 12, 2017 Share Posted September 12, 2017 I have a modified such modulator, where I get separate sound and video out. I use coaxial connectors for both, one BNC and one of a different type, to easily tell them apart. My console has 64 K 16-bit wide RAM internally, which is another modification which adds both memory and also speed. All external memory (in the expansion box) is otherwise 8-bit wide. 1 Quote Link to comment Share on other sites More sharing options...
repetto74 Posted September 12, 2017 Author Share Posted September 12, 2017 Hi Apersson850 Any link for a tutorial explaining how to mod the TI99/4A to 64K ? 1 Quote Link to comment Share on other sites More sharing options...
jens-eike Posted September 13, 2017 Share Posted September 13, 2017 My old LCD-TV (LG 42LF65) took the TI signals on YPbPr input - best possible quality without any modulator! The RGB circuit in "Chicago TImes" (ca. 11/1986) is quite easy, only a handful of transistors and passives. That is my favourite, if you have a RGB-capable Scart input. Quote Link to comment Share on other sites More sharing options...
repetto74 Posted September 13, 2017 Author Share Posted September 13, 2017 Yes the TV can handle RGB as I connected a Spectrum 128k +2 Grey model which comes with a RGB video output through a SCART cable. Any tutorial on how to do this also? Quote Link to comment Share on other sites More sharing options...
apersson850 Posted September 13, 2017 Share Posted September 13, 2017 Hi Apersson850 Any link for a tutorial explaining how to mod the TI99/4A to 64K ? There must be some for a similar modification. Probably on WHTech. But not exactly for my modification, as it's my own design. Normally the similar modification installs 32 K RAM inside the console. But to get it 16 bit wide, you but two 32 K chips in there. I though that was a tad stupid, to leave 32 K unused, so I came up with an additional circuit design, which allows you to page in the other 32 K too, 8 K at a time, so that you can get 64 K contiguous RAM in the machine. Thus you can overwrite ROM and change the operating system too, if you like. My design also allows disabling the internal 32 K normal memory expansion. If you want to. If you do, the CPU will instead see a 32 K RAM expansion in the expansion box, i.e. the normal memory expansion. So my design allows more than just a memory expansion. Fast 32 K RAM expansion internally Another 4 * 8 K RAM can be enabled, overlapping all other memory banks in the console The 32 K internal expansion can be disabled, to allow access to 32 K RAM in the expansion box The paging is done with CRU bits. The design is done so that it starts with the fast internal 32 K RAM expansion enabled, and the rest disabled. Thus, after a reset, the machine behaves like it had a normal 32 K RAM expansion, just faster. Quote Link to comment Share on other sites More sharing options...
repetto74 Posted September 13, 2017 Author Share Posted September 13, 2017 Hi Apersson850, Ok now I understand what you mean. Well I would say that considering the fact that the CPU can address 32k of ram maximum I would say that this will be enough for me. I am just a newbie for what concerns TI99/4A and have a lot of work to do in order to use the machine correctly. Actually I need to build a cassette tape cable to use with the cassette recorder. Then I can consider modding the total ram to 32k (found this tutorial https://www.harmlesslion.com/text/TI%2032k%20Mod.pdf)and then maybe later on I may consider a nanoPEB if this piece of electronic is still available for sale :-) Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted September 14, 2017 Share Posted September 14, 2017 will add http://www.ti99iuc.it/web/index.php?pageid=119&pagina=mod_proj1&sezione=4&data=Mod_and_Tuneedto the faq Greg 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.