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boards:sbc:sbc-386ex [2018/01/09 23:55]
jcoffman [Project Status]
boards:sbc:sbc-386ex [2018/05/17 18:00] (current)
jcoffman [Project Status]
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 ==== Project Status ==== ==== Project Status ====
  
-<font 14px/​inherit;;​inherit;;​inherit>​2017-Nov-17:​ A third round of prototype boards have arrived (see above).</​font><​font 14px/​inherit;;​inherit;;​inherit>​They</​font><​font 14px/​inherit;;​inherit;;​inherit>​will</​font><​font 14px/​inherit;;​inherit;;​inherit>​use</​font><​font 14px/​inherit;;​inherit;;​inherit>​the</​font><​font 14px/​inherit;;​inherit;;​inherit>​adapter</​font><​font 14px/​inherit;;​inherit;;​inherit>​boards,​ and will check out a subset of the circuitry to be used on any final board. There may be additional "​prototype"​ rounds to check out other circuitry, before committing to a fully functional SBC.</​font>​+<font 14px/​inherit;;​inherit;;​inherit>​2017-Nov-17:​ A third round of prototype boards have arrived (see above).</​font><​font 14px/​inherit;;​inherit;;​inherit>​They</​font><​font 14px/​inherit;;​inherit;;​inherit>​will</​font><​font 14px/​inherit;;​inherit;;​inherit>​use</​font><​font 14px/​inherit;;​inherit;;​inherit>​the</​font><​font 14px/​inherit;;​inherit;;​inherit>​adapter</​font><​font 14px/​inherit;;​inherit;;​inherit>​boards</​font><​font 14px/​inherit;;​inherit;;​inherit>​, and will check out a subset of the circuitry to be used on any final board. There may be additional "​prototype"​ rounds to check out other circuitry, before committing to a fully functional SBC.</​font>​
  
 <font 14px/​inherit;;​inherit;;​inherit>​2017-Nov-20:​ Board running @ 20Mhz (40Mhz osc.) and passing memory test. I switched from a 64KB (28 pins) flash to 128KB flash (32 pins) to avoid positioning errors when strapped for Vcc on pin 30(28). The SST 128KB flash erases and programs faster, too.</​font>​ <font 14px/​inherit;;​inherit;;​inherit>​2017-Nov-20:​ Board running @ 20Mhz (40Mhz osc.) and passing memory test. I switched from a 64KB (28 pins) flash to 128KB flash (32 pins) to avoid positioning errors when strapped for Vcc on pin 30(28). The SST 128KB flash erases and programs faster, too.</​font>​
  
-2018-Jan-09:​ Three boards are running now at 25Mhz and 33Mhz. ​ Speed limitation is the FPU, since Intel FPU's only go up to 25.  Cyrix FPU runs at 33Mhz, but requires a board mod to handle the READY# line with a 74LS241. ​ The prototype board has served well as a learning experience with this high-integration CPU chip.+2018-Jan-09:​ Three boards are running now at 25Mhz and 33Mhz. Speed limitation is the FPU, since Intel FPU's only go up to 25. Cyrix FPU runs at 33Mhz, but requires a board mod to handle the READY# line with a 74LS241. The prototype board has served well as a learning experience with this high-integration CPU chip.
  
 <font 14px/​inherit;;​inherit;;​inherit>​–JRCoffman (johninsd at gmail dot com)</​font>​ <font 14px/​inherit;;​inherit;;​inherit>​–JRCoffman (johninsd at gmail dot com)</​font>​
  
  
boards/sbc/sbc-386ex.txt · Last modified: 2018/05/17 18:00 by jcoffman
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