Korvet 8010 have not fdd option. Actually several chips was on soldered on the motherboard. (Actually motherboards are the same!). In this case computer may be loaderd from network or using sdcard (modern additional, not exists at 1990).

Here is successfull try to create sdcard adapter, connects on left connector and allow booting CP/M from sdcard

Programming

For Atmega32 fuses should be H: D1, L: E4. Set only once, no change in next programming cycle.

Chip programming with avrdude:

avrdude -p m32 -c stk500 -P /dev/ttyACM0 -V  -U lfuse:w:0xe4:m -U hfuse:w:0xd1:m

EEPROM contain loader phase 1 (xboot.asm). With this fuses (see up) loader will not erased on flash reprogramming, so programming only once.

avrdude -p m32 -c stk500 -P /dev/ttyACM0 -U eeprom:w:xboot.bin:r

And flash programming

avrdude -p m32 -c stk500 -P /dev/ttyACM0 -V  -U flash:w:extrom.hex:i

Notice

  1. Before insert sdcard first time - check voltage, only 3.3v!, 5v will completely damage sdcard

  2. Atmega programming should be done also without sdcard.

  3. Debug port at TxD Usart. Speed 1000000-8-N-1. Debug output may be usefull while setup.

  4. In conclusion check mega voltage. On computer side in connector 12v exists on several pins, so don’t be wrong.

Files and downloads

Sources

Topic on zx-pk (russian)

Discussion archive

Booting from external ROM topic

Photos

sd card adapter