Difference between revisions of "NuXT"

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(Version 1.2)
(Version 1.1)
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== Version 1.1 ==
 
== Version 1.1 ==
 +
 +
* VGA disable fixed
 +
* Floppy disable fixed
 +
* Serial circuitry moved to improve reliability
 +
* Re-arranged board to allow 16-bit cards in 3 of the 4 slots instead of 1 of the 4
  
 
== Version 1.2 ==
 
== Version 1.2 ==

Revision as of 16:53, 3 June 2019

NuXT Motherboard (v1.0)

Features

  • 8088 and NEC V20 support
  • 8087 co-processor support
  • 4.77MHz, switchable to 9.55MHz with Ctrl-Alt-+
  • 2x64K ROM, switchable with DIP switch, writable
  • 800K SRAM
    • 640K conventional
    • up to 160K UMBs (128K max when using VGA)
    • Configured DOS 6.22 uses only 10K conventional!
  • Highly-compatible TVGA9000i SVGA
  • HD Floppy controller, with FM support
  • Bootable CF Card Interface - 64MB CF Card Included! Loaded with DOS and ready to go.
  • ROM Socket, supporting 8K and 32K ROMs, writable
  • 16C550 Serial Port
  • PS/2 Keyboard Port
  • ATX Power Input. Generates own -5V
  • 4 x 8-bit ISA Slots
  • Front-panel connector for modern cases
  • Highly configurable via DIP switches. All onboard peripherals can be disabled

Version 1.1

  • VGA disable fixed
  • Floppy disable fixed
  • Serial circuitry moved to improve reliability
  • Re-arranged board to allow 16-bit cards in 3 of the 4 slots instead of 1 of the 4

Version 1.2

Changes from Version 1.1 include:

  • Black PCB
  • Memory address decoder SPLD replaced with discrete logic.
  • More documentation text on the back
  • Changed to 4-layer PCB to make routing easier.
  • moved RS222 transceiver next to the UART, and routed to the serial port all 9 wires including GND, alone as if it was a serial cable.