Help Needed!! FDD35 and latest Ti-Of-TTL by pear

[Johnny Red]

Thank you for a solution but I do not want to modify the hardware.
I need this interface to work with ZX/2048/2068/128K by only changing the EPROM/EEPROM.

-2068_1.ROM computer boots as usual, if a TOS command is typed, computer waits for response but no activity on FDD.
(...)
How to fix this?

This rom image looks good (If it realise "fast boot"), but there are two models of port comunication.
First uses D0..D3 - for data, D6 and D7 - for flow control.
Second uses D0..D3 - for data, D4 and D6 - for flow control.

So, try to reroute O7 and I7 signals (on D-sub side) from D7 to D4 on the buffers.

[ArturM]

So... Correct the ROM image to use alternative bits. We discussed here about this https://www.speccy.pl/forum/index.php?topic=2801.msg106914#msg106914

[Johnny Red]

I'll check the low level comm routine again if I changed all bits.
That thread was about zx/2048 ROM image for TI-of-TTL, not native 2068/2086.