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About helocast

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    Chopper Commander
  • Birthday August 17

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  1. There's code here which seems to be regularly updated and it could be adapted for 16 phroms, but I don't know why you'd want that many with TE II. https://www.waitingforfriday.com/?p=30
  2. It's four layers. If you use the translate feature of your browser, his entire V1 + V2 timeline is posted at his link so I won't attach it here. Doug
  3. True. For completeness, GROMs map ONLY at adresses >5BFC (read data), >5BFE (read address), >5FFC (write data, not used) and >5FFE (write address).
  4. A great product that is built to last outlives its advertising.
  5. That's the nice part - size is given by the part number. CR2430 = 24.5mm x 3mm (225 mAh), CR2032 = 20mm x 3.2 mm (270-290 mAh) 😉
  6. Oh lordy, yes and yes. I had trouble sourcing CR2430 holders ... should have just gone with lower profile CR2032 conversions. Profile is too tall to go back in their shells, but I have so many project carts I don't have cases for so what's a couple more. Haven't tried the CR2032 printable one up on Thingverse yet https://www.thingiverse.com/thing:635231
  7. For those that aren't current Udemy members, there's a course sale today only. Many titles retailing for $100-$200 can be purchased for $10.99. https://www.udemy.com/crash-course-electronics-and-pcb-design/ - This course includes 99.5 hours on-demand video 10 downloadable resources Full lifetime access Access on mobile and TV Certificate of Completion I have no affiliation with this company, but everybody likes saving money, right? And for those of us lacking formal degrees or means are out of our price range, there is more than enough here to allow you to brush up on a topic of your choosing or look at topics in a different way than traditional classroom lectures. Doug
  8. Welcome! My favorite info/links and go-to collections: Thierry Nouspikel's site is a good source on components, hardware parameters, theory of operation, and DIY projects: http://www.nouspikel.com/ti99/titechpages.htm Static pages of Ron Reuter's is a good source on history, peripherals, schematics, and DIY upgrades: http://www.mainbyte.com/ti99/ Rich Polivka's site is a good source on history, cross-referenced database of databases, and literature: http://99er.net/ ... and of course the pinned forums here https://atariage.com/forums/forum/164-ti-994a-computers/ and here https://atariage.com/forums/forum/119-ti-994a-development/ Doug
  9. Eh, no harm no foul.😁 It only gives me more insight into corporate America. I've been giving Ebay a ton of money recently, so it's good to know they too finally succumbed to targeted advertising to d̷e̷f̷r̷a̷u̷d̷ ̷c̷u̷s̷t̷o̷m̷e̷r̷s̷, er fill their coffers.
  10. Unfortunately, no. Tried the manual menu buttons and remote - it lacks the intelligence on the 15-pin PC input to up/downscale. Pity too because every other function/port works like it's supposed to work. I guess I have a backup monitor/tv for other things ...
  11. I'm guessing they changed the code, "Looks like that's the wrong code. Please double-check and try again." Maybe they'll catch it and update it ...
  12. This pinned forum post is regularly updated: I'm glad you found a solution to get you running on the FG99. I ONLY have QI models because that's what I specifically look for in eBay/Goodwill sources. I was disappointed I've never been able to use my FG99 because I bought it early/before the community decided it won't support QI motherboards. I have yet to see that point specifically mentioned in the FAQ/user homepage, but at least everyone agrees it doesn't work. Doug
  13. Yes, but I'm going to give it a thumbs down vote. I've attached four screenshots: All should be recognizable where they are generated from and their display mode. I can't see a way to force it out of 640x480 mode, so only about 1/4 of the screen real estate is viewable/available, unless someone can tell me how to get the F-18A to generate 35.1, 37.9, 48.4, and/or 49 KHz output/horizontal scan frequency. For review completeness, I will add I already popped the case to see the guts. The thing is light + thin, literally like picking up a Frisbee. Other than the display panel, there is a combined board https://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=rca+rt1971-ac "spare" replacements that can be had now in quantity for < $10 if someone buys this and wants to future proof it. Coax TV looks great. HDMI looks great. Haven't tested composite or RGB component inputs. It supports plugging in USB media to play music, view pictures (haven't checked all formats), and text files (haven't checked all formats). Sound is tinny w/o a lot of bass which can be expected for its size. Supports date/time, 12/24 hr, manual/auto-set from menu via TV input source, and auto-DST. If anybody wants other/more detailed usage is free to DM me and I'll try out and report on other features.
  14. Hi Sid, Normally I have extras that I could send as I repair quite a few boards, but your best bet is hopefully someone else has some left over from a donor board and will reply here. Of course the original GROMs are out of production, but you can usually just type in the part number you are seeking (see attachment) in your browser search engine to find (mostly) China companies with NOS. Rules of the road unfortunately are that many of them have a minimum purchase quantity/money amount before they will even look twice at an RFO supplying individuals. I use WorldwayElec https://www.worldwayelec.com/pro/texas-instruments/cd2155nl/3692809 or Alibaba https://www.alibaba.com/countrysearch/CN/cd2155nl-supplier.html It is kind of a cat and mouse game with whoever you chose though as most have no idea what they stock or chip function or even what application it is used for - they are simply forwarders who have purchased bulk sell off items. In the case of the attached, I quoted them $2 per chip and that wasn't sufficient as they responded wanting $2.50 per chip. Stay away from CD2155ANL (GROM 0) which is the V2.2 version designated by the A in the part number ... and you shouldn't have to replace GROMS 1 (CD2156NL) and 2 (CD2157NL) provided they are serviceable because only GROM 0 was changed. Hope that information helps. Doug
  15. Went by your recommendation alone (even if it means stretching my VA medications out a couple of months) - it came to $81.18 after my city + governor's cut. Walmart was on my boycott list, but I can't remember why now, so ¯\_(ツ)_/¯
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