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Found 5 results

  1. Regarding a recent discussion on the various aspect ratios available to the stock console (or emulations thereof), there seems to be some clarification needed on what the actual aspect ratios are of the original TI output (both 60Hz and 50Hz). I say "needed" because, firstly, this info is very hard to find, and, secondly, there is a belief among some that the TMS9918, at least, has a 4:3 aspect ratio addressable pixel area with square pixels. This is not true, and, consulting the datasheet to solidify the numbers in my own mind, it is clear that neither the TMS9918A nor the TMS9929A employ use of square pixels. Most of the emulators I've seen use square pixels. Hopefully these numbers will be of use to someone else at some point. On page 5 of a document entitled TMS 9918A 9928A 9929A VDP Preliminary Specification 1981, there's this section: The hasty handwritten figures aren't mine; that's how I found this document on the web, and boy, it is not an easy document to find. Here it is for posterity, and, from this datasheet, plus the F18A documentation here, I've put together a side-by-side comparison of the different aspect ratios offered by each VDP. Remember that all of these are designed to send their output to a 4:3 screen. With the TI's addressable pixel area being 256x192, or also 4:3, you may think that this is a great match: 4:3 addressable area to a 4:3 screen = 4:3 aspect ratio. But no, the timings of the various analogue video systems have to be respected, so extra pixel rows and columns are required to border the addressable area. The 60 Hz VDP outputs an area of 284x243, although only 256x192 pixels are addressable, while the rest of the 'pixels' are set to a solid background colour. The 50 Hz VDP outputs an area of 284x294, although, again, only 256x192 pixels are addressable. Of course, there are no actual 'pixels' in the border area, but the pixel clock is running, nonetheless, and a pixel width is used as a reference in the above datasheet for the amount of vertical or horizontal space occupied by this area. The F18A outputs square pixels, as asserted by the chip's designer. However, square pixels (1.333:1) are a slightly different 'squeeze' to what you'd get from an NTSC console (1.52:1), and very different to what you'd get from a 50 Hz console (1.82:1). Given the numbers provided by the creators of all three products, the side-by-side comparison of aspect ratios looks like the following diagram: Personally, I most prefer the NTSC shape. It's a nice fit for the available screen area. The 50 Hz (PAL) that I have access to I.R.L. is too squashed in the vertical direction (or "short"), while the F18A is too "tall" for my liking. That being said, my previous sentence is merely my opinion, and not a slight on anyone nor any reason to take offense. I'm just stating a preference, and y'all are welcome to your own! Also, please note that results may vary, depending on the knobs and settings on your old CRT. On some of them, you can adjust H-WIDTH, and even V-HEIGHT is often a possibility. Both of those will alter the aspect ratio by squeezing or stretching the image. LCDs do a better job of remaining faithful to the input signal and not chopping anything off, but, if you fiddle with the menus, you can usually override that as well, depending on the monitor. If I've made any errors, please let me know!
  2. Hey all, Here is a question... so the TI disk system reserves space at the top of VDP memory for file buffers. You can reduce this by from 3 file support to 1 by calling the FILES subprogram, but it still takes up space from about >3B00 onwards. My question is... can you safely wipe out this section, say if you wanted to put the sprite pattern table at >3800 onwards? Obviously it would trash the sprite pattern table if you had to do a file load later on, but if you could restore the data from CPU memory afterwards it seems alright. Obviously it would be stupid to try and do a memory image load INTO this section...
  3. Hello fellow 99'ers... I have a bit of a proof-of-concept I'm mulling over... create a large full-screen (maybe just the upper two sections) scrolling map in full bitmap mode on the TI. I'm trying to figure out the best implementation for this. The first method I had in mind was to treat bitmap mode as it is, characters 0-31 along the top row, 32-63 on the next, etc. Moving in a given direction just rotates the screen table assignments and then loads new graphics patterns for the newly visible blocks. The problem I see with this method is you can't buffer anything. It's going to LOOK messy, with characters you just moved out of view re-appearing briefly on the other side until it fills in graphics patterns. Seems way too slow and awkward... The other method would be to have specific character assignments for given tiles (wall, floor, etc). This becomes much easier to implement, but you lose the flexibility of bitmap mode, and you artificially limit yourself to 256 patterns maximum. (My intent is to possibly have much more than that...) So the only thing I can figure on doing is a hybrid approach; treat some part of the character table set as fixed pattern, and then have any objects/tiles I want to be unique actually occupy their own character patterns. That lets me quickly build a new view in CPU memory and output it to VDP quickly. The main headache I can foresee here is that you're going to have to manage those patterns and figure out when a given pattern is available... could end up getting very annoying. Has anyone dealt with this, or has some insight I may be missing? Adam
  4. Check out this thread from the Colecovision forum: http://atariage.com/forums/topic/216268-my-first-test-on-the-tms9918/ Maybe this can be used also on our system? Both systems share the same VDP.
  5. Has anyone ever tried figuring out how old your beloved machines are going by the occasional date codes printed on the microchips used on the console CPUs and cartridge ROMs? For example, some Texas Instruments chips may have a date code in the format of year/week. One or more of these may have "8249" stamped on it, which means year 1982, week 49. I am sure there are other date code formats used on these besides. Have any of you discussed date codes of microchips yet? ~Ben
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