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jens-eike

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About jens-eike

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  1. A plain copy is probably impossible, too many custom chips. The TMS9995 is non-standard with internal RAM disabled.... It would be easier to emulate the internals with a CPLD or alike.
  2. It is clearly marked already: TI used the groove at the side of pin 1 (to 20) on many chips in the 1970s
  3. Yes, my first computer was a TI-99/4 with PAL modulator (and internal speaker/pot). TI abandoned the NTSC monitor bundling before and used the TMS9929 (no A).
  4. the keyboard and innner functions (ASCII-codes) are identical, only difference came with the character definition files (CHARA1) in e.g. TI-Writer. You had to type [ for Ä, { for ä, \ for Ö, ] for Ü and so on (German language)
  5. I used the board to make a GRAM-device (like GRAM-Kracker) with battery backup and logic for bank switching the >6000 ROM XB-style. The two stacked NEC D43256 are the GRAM, two 6264 (below the leaked battery) are the ROM (when write protected).
  6. The EPROM(s) parallel to the 'LS161 counters is the GROM and the EPROM perpendicular is the ROM.
  7. The QI power supply (with 2 wires in) works from 18V DC.
  8. 16 TMS9995 in parallel: http://famkoplien.de/henry/TI99/
  9. My Geneve has heat sinks on the regulators, hence it cannot use the case - but the back part of the case helps with the correct orientation and seating. When you close the PEBox's lid, the foam will press the Geneve into its slot. As you can see, I've done it with the Geneve and HFDC. The box is upright (drives on top).
  10. http://www.famkoplien.de/henry/TI99/
  11. Not a BwG card: see this picture: https://www.s-n-u-g.de/bwg/index_fr.php The TMS9901 is typically a sign of a CorComp card. My CorComp card has a 1773 controller, but I have seen the 2793 mentioned (on whtech?), they are software compatible.
  12. There is no simple PAL video cable, the console has outputs for YUV (aka YCbCr/YPbPr?) component signals. Some modern TVs can take these directly (my LG 42LF65 did). Otherwise, the PAL modulator mod gives you the composite signal (slightly better quality than from US NTSC consoles), or you could use the SCART/Peritel RGB modulator (mostly sold in France) for the best quality picture. A schematic for an RGB-enoder was in the November 1988 issue of the ChicagoTImes, I built this twice, good stable picture. Then there are upgrades based on the 9938 VDP ("80column cards"), or the F18A for VGA output.
  13. With proper address decoding, only one CRU device is active at any time - so this shouldn't be an issue. The 9901 in the console isn't fully decoded, so keep out of it's address range! http://www.mainbyte.com/ti99/schematic/schematics.html has several schematics, the FDC card has the '251 connected directly to CRUIN.
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