Omega-TI Posted December 8, 2020 Share Posted December 8, 2020 4 hours ago, wietze said: Asmusr pointed me out in PM that I have a TMS9929NL chip, which is lacking the `A'. Which in turn implies it does not have support for the bitmap mode. I hope that I can just replace the TMS9929NL chip with a TMS9929ANL chip then! If you don't have a spare lying around, PM me with your address (assuming you are in the U.S.) and I'll mail the used one I pulled out of my system a few years back... if you don't mind having to straighten a few bent pins. Quote Link to comment Share on other sites More sharing options...
atrax27407 Posted December 8, 2020 Share Posted December 8, 2020 A TMS9918ANL is NOT a replacement for a TMS9929ANL. 2 Quote Link to comment Share on other sites More sharing options...
Omega-TI Posted December 8, 2020 Share Posted December 8, 2020 1 hour ago, atrax27407 said: A TMS9918ANL is NOT a replacement for a TMS9929ANL. Crap, obviously I wasn't thinking. 29 is not 18... DUH! Well, they say Senior Moments are not bad... unless they all run together. 1 Quote Link to comment Share on other sites More sharing options...
+mizapf Posted December 9, 2020 Share Posted December 9, 2020 On 12/7/2020 at 10:53 AM, wietze said: Just opened her up, and it seems to have a TMS9929NL vdp chip. I currently connect the machine to the display using a `Texas Instruments TV PAL Encoder PHA 2030'. Could the use of a PAL vdp chip cause the abovementioned graphical behaviour with some programs? (Edit: some thread in this forum suggests that all cartridges encountered are PAL/NTSC compatible; so I assume answer is `no'). How come there is a wrong VDP inside your console? The non-A variant should only be in the TI-99/4, I should have expected. 3 Quote Link to comment Share on other sites More sharing options...
wietze Posted December 10, 2020 Author Share Posted December 10, 2020 On 12/9/2020 at 6:11 PM, mizapf said: How come there is a wrong VDP inside your console? The non-A variant should only be in the TI-99/4, I should have expected. No idea, this is how I got it. Quote Link to comment Share on other sites More sharing options...
Jeff White Posted December 10, 2020 Share Posted December 10, 2020 What is the copyright date on the title screen? What menu options do you have after pressing a key? 1 Quote Link to comment Share on other sites More sharing options...
wietze Posted January 8, 2021 Author Share Posted January 8, 2021 I replaced the (non-A) VDP with a TMS9929ANL. And now the machine displays bitmap graphics. Awesome! This resolves the issue I had. Now I can play all the nice TI games to my delight! Thank you for the help. 3 Quote Link to comment Share on other sites More sharing options...
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