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boards:sbc:sbc-386ex [2018/05/17 18:00]
jcoffman [Project Status]
boards:sbc:sbc-386ex [2018/12/01 15:34] (current)
jcoffman [Project Status]
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 ====== SBC-386EX ====== ====== SBC-386EX ======
  
- Disclaimer: ​ this is a work in progress+Disclaimer: this is a work in progress ​(still; 30-Nov-2018) 
  
 ==== The Processor ==== ==== The Processor ====
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 Two 50mm X 50mm adapter boards with 80386EX in place. The pin connections are on a 2mm grid and are 2×17 pins each. Two 50mm X 50mm adapter boards with 80386EX in place. The pin connections are on a 2mm grid and are 2×17 pins each.
  
-==== The prototype board SBC-386EX-0 ==== 
  
-[[https://​www.retrobrewcomputers.org/​lib/​exe/​fetch.php?​tok=b330fc&​media=https://​www.retrobrewcomputers.org/​lib/​plugins/​ckgedit/​fckeditor/​userfiles/​image/​boards/​sbc/​img_0944_sm.jpg|{{ ​ https://​www.retrobrewcomputers.org/​lib/​plugins/​ckgedit/​fckeditor/​userfiles/​image/​boards/​sbc/​img_0944_sm.jpg?​direct&​716x440 ​ |www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_boards_sbc_img_0944_sm.jpg}}]] 
  
-This board take several short-cuts: SRAM instead of DRAM, limited peripherals. However, it is a test bed to learn …+==== Project Status ====
  
-  ​Enabling the slot-15 I/O ports (all of the on-chip goodies); and disabling them, too. +2018-Nov-30:  Full info for the 2.0/2.1 board is posted on the Wiki for those beyond ​the test development group.
-  - Programming ​the I/O and memory chip selects(critical) +
-  - Using 16-bit and 8-bit mixed ports. +
-  - Accessing & programming the serial I/O port 0 at 0x03F8. +
-  - Getting to the timers. Possible automatic determination of CPU clock speed. +
-  - Using a new access method to get to the DS1302. Three pins on one of the parallel ports should work. +
-  - Enabling ​using the 387SX math co-processor. +
-  - Accessing peripherals on the ECB bus; i.e., other RetroBrew boards.+
  
-DRAM, synchronous serial I/O (SSIO), and DMA will have to wait for another prototype round.+2018-Jul/Aug:  BIOS largely complete; but MSDOS manages ​to go beserk after successfully booting.
  
-----+2018-Feb-18:  Final PLD equations get the DRAM operational. ​ A one-wire update to the board is required.
  
-Here's the board 98% built-up, lacking only FPU & RTC crystal: +2018-Jan/Feb Rev 2.boards ​are ready.  ​These are good boards ​with DRAM.
- +
-[[https://​www.retrobrewcomputers.org/​lib/​exe/​fetch.php?​tok=434639&​media=https://www.retrobrewcomputers.org/​lib/​plugins/​ckgedit/​fckeditor/​userfiles/​image/​boards/​sbc/​img_0948_sm.jpg|{{ ​ https://​www.retrobrewcomputers.org/​lib/​plugins/​ckgedit/​fckeditor/​userfiles/​image/​boards/​sbc/​img_0948_sm.jpg?​direct&​800x516 ​ |www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_boards_sbc_img_0948_sm.jpg}}]] +
- +
----- +
- +
- +
-==== 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</​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-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>​
boards/sbc/sbc-386ex.1526594434.txt.gz · Last modified: 2018/05/17 18:00 by jcoffman
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