Posted By
SukkoPera
on 2023-09-25
13:36:37
|  Re: Covox Speech Thing - parallel port adapter
Actually no difficulty on your side, I just tried to make a long story short  .
The thing is I have two SD2IECs: one I bought from TFW8B at least 5 years ago, the other one I built myself after modifying the SD2IECpluggable design. I wanted to install FlexSD on the latter, since I have no idea about what hardware is in the former and it has a nice case I don't want to break apart (and Google didn't help). Besides, I also wanted to take the occasion to put the bootloader on the latter, as I used to flash the firmware straight into it, since bootloader instructions were unclear.
So it took me a while, but in the end I figured out that the bootloader to use is newboot from here AND that when using it on an ATmega644P, for instance, the high fuse MUST be set to 0x92 rather than to 0x91 as all guides around say. Then you can just put a firmware file in the root of the SD and it'll pick it up.
Oh, of course when I was done I forgot to delete the bin file from the SD and I put it in the other SD2IEC, which instantly flashed itself and got bricked  . So I had to dig and finally found out that it is an SW2 architecture with an ATmega1284. This is actually the interesting piece of information that might be worth documenting  .
Oh, one more thing: the installed version of SD2IEC can be discovered by reading the error channel right at power-on. That requires a short BASIC program that can easily be found around, or just enter "@" if you have JiffyDOS.
And let me tell you again that WavePlay-SD is some great work! 
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