MueThor

Hello jedimatt42, Ooops, didn't know that. Sorry, hopefully you haven't felt my statement(s) insulting. Well, lucky me having been fast enough to buy CF7+ and NanoPEB .

Hello guys, Not knowing where else to attach following I'm sticking an idea of mine to this thread: How is about exchanging the 3MHz version CPU TMS9900NL with the 4MHz version TMS9900NL-40 (plastic dip) or TMS9900JDL-40 (ceramic dip) to speed up the TI 99 4a? Has anybody of you already tried to realize this idea? I undertook a research via www on this topic, but didn't find anything. Does anyone of you know, if the internal electronic structures of these two versions of the CPU are probably built up slightly different (e.g. the circuit pathes have different widths despite having been produced using the same technology called NMOS)? If you can swap the two versions of this CPU, can you also overclock the 4MHz version CPU? If you must also change other ICs of the TI in order to exchange the two versions of CPU, then which other ICs have you got to replace? Best Regards,

Dear Asmusr, Wow, really jaw dropping your F18A version of Super Mario Bros . Now, I don't want to tread on anyone's of you guys foot, but I would still like to see the realization of a Super Mario Bros game running on the TI 99 4a without F18A (written in Assembly). You have surely noticed that many people like me couldn't afford the 32k memory back in the 80's, when I was a child. So we were jealous of the people, who had a C64. And you were the first to show that it would have been possible to realize in the case of the TI 99 4a with 32k memory games at nearly the same level of programming perfection like in the case of C64. It would be nice, if you also released a version of Super Mario Brothers in the future running without F18A . Regards

Dear jedimatt42, hello all other folks , Here in the TI 99 4a-forums I am a very passive member. But I have to tell you all following: Seeing what you are all doing and realizing, experiencing your thoroughly and deep knowledge of soft- and hardware lets me become smaller and smaller , so I have to hold you all in high esteem :thumbsup: . Now, my special question to you, jedimatt42: Please, would you be so nice to outline the reasons for developing this 32k expansion for the sideport? Does your solution have any further advantages in comparison with the already existing solution CF7+? Best Regards,