Project Logs

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• Construction

  Keith • 04/27/2022 at 00:29 • 0 comments

  2022-04-25

  Soldered on the Mini Cortex board:

  • U1 TMS9995 socket
  • U3 74LS14
  • U6 74LS688
  • U9 omit FTDI module and use FTDI cable instead
  • U10 74LS259
  • U12 74LS74
  • U13 74LS112
  • U14 74LS138

  2022-09-30
  

  • U2 memory mapper socket, DIP40.
  • U4 32K ROM socket, DIP28.
  • U5 512K RAM socket, DIP32.
  • U8 9902ANL, DIP18.
  • U11, DIP24 socket for 22V10.
  • X1 crystal, 12 MHz or near.
  • J3 for FTDI cable.

  2022-10-02

  • R3 and R13 (LED resistors)

  2022-10-16
  

  • Program 32K EEPROM AT28C256 with firmware.
  • Program U11 PAL ATF22V10C.

  To do:
  

  • Find and fit TMS9902 serial chip
  • Test BASIC operation
  • Find and fit memory mapper chip
  • Fit compact flash

• Project Log

  Keith • 09/28/2019 at 22:53 • 0 comments

  2019-09-23

  Ordered TMS9995, TIM9904 and TMS9929A from Chinese source.

  TMS9929A is a PAL video chip, but might be useful on a simple video display board. Might make one board support multiple chips e.g. a 6847 as well.
  

  2019-10-09

  TMS9995 and TIM9904 chips arrive.

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