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About apersson850

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  1. When I was doing a lot of programming on my TI 99/4A, I usually wrote everything that was doable in Pascal in - you get it - Pascal. There are a few things you can't access, like CRU bit etc., but most things can be done in Pascal. Then, when the program was debugged and the idea found feasible, I evaluated if there were segments of code that delayed the result too much, so that they were worth the effort of converting them to assembly language. If so, I did that, thus keeping most (hopefully) of the program in the easier-to-use Pascal and only converting the parts that really makes a difference to assembler. I've never seen the need to write programs that necessarily are only one or another language, when you can use more than one in the same application, each to its benefit. There is, for example, rarely any improvement in reading data the user is typing in by an assembly program. The user is so slow anyway, that you can do that on a higher level. But processing the data, there you may gain something from going the assembly way.
  2. I agree that the CRLP is probably the culprit. It's writing to 8000 bytes of memory. Chances are you are wiping something out there. Depends on where ADRTO is.
  3. apersson850


  4. DELETE was used because it was a command that could be executed without any CALL and without a file open.
  5. I once wrote a driver unit for accessing the clock on the Triple Tech from UCSD Pascal.
  6. My expansion box is full now. Interface card RS 232 card 32 K RAM expansion card P-code card Real-time clock card I/O card RAMdisk card Disk drive controller card
  7. Fortunately they don't fit in countries with more modern electric systems.
  8. Good, then it works on 60 Hz without any problem. No worries, then. I just wanted to make sure you were aware of the potential risk, so you don't put anything on fire.
  9. Now note that if the TV set is rated at 50 Hz only, nothing says it will run at 220 V 60 Hz, which it will be when used in the US, with a simple 1:2 transformer in between. Depending on the design of the power stages in the TV, the impact could be anything from none to disasterous. I have no way of assessing the possible effect on your TV, but the risk is there.
  10. "Tomorrow" would be my first choice, since I by chance will spend the weekend in Texas. Not Austin, but closer than I normally am.
  11. That shouldn't make any difference, provided the VCR works. Inside such a modulator, it's usually possible to fine tune the channel it uses. That's intended for television sets with fixed channel steps, where tolerances may imply that the two devices can't perfectly match their channels. If the TV looks at channel 36.3 and the modulator outputs 35.8, some fine tuning is necessary. I've never needed to do that, so I can't say for sure if, and then how, you do that with the TI modulator.
  12. The RF modulator for European consoles is supposed to emit an antenna signal, tuned to UHF channel 36. That antenna signal should include both the image and the sound. You can look at a picture of such a modulator. The channel number is printed on the label. This particular one has been modified to output composite video and sound on two separate coax ports (one BNC and one RCA connector).
  13. I've only used my home-made RAM-disk to keep the SYSTEM.EDITOR, SYSTEM.COMPILER and SYSTEM.FILER when using the UCSD p-system. Since that operating system relies quite a lot on swapping these files in and out, it makes a big difference. Only recently have I added two Horizon RAM-disks, but not done so much more than figuring out why the ROS 8.xx didn't support the p-system. Got it going, but I'm not doing much with my TI nowadays.
  14. A monitor which supports both PAL and NTSC is, by defninition, independent of the mains frequency. Otherwise it wouldn't be able to support both versions of input, at least not without moving it from the US to Europe, for example. I've never seen any such monitor that couldn't accept both inputs regardless of the mains frequency. One could imagine that PAL would only work with 50 Hz supply, and NTSC only with 60 Hz supply, but no, I've never seen that. And it's Hz, not hz. Units named after people start with a capital. So it's A for Ampere and Hz for Hertz, but m for meter and s for second.
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