Keith-
Construction
04/27/2022 at 00:29 • 0 comments2022-04-25
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
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Project Log
09/28/2019 at 22:53 • 0 comments2019-09-23
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.
Stuart Conner's Mini-Cortex board build
Stuart Conner's Mini-Cortex board build