Hi Sety, I'm interested, but in the UK. What are we looking at for postage to here, or is the $10 AUS an overall figure? AUD $21.20 for economy, $28.20 for tracked. :( Unless you can somehow convince them it's a letter. EDIT: You probably could convince them it's a letter! For $7, Max weight is 125...

You probably need to start with whereabouts you're located in the world.

Ummm, no, sorry. I can try changing the buffer size back to 507 bytes for you when I get home from work tonight, though. Maybe that's more likely to precipitate the failure.

Actually in my updated version I changed the sectors from 507 bytes to 512, so I should actually compare it an array of 32-bit words instead if maximum speed is the goal.

this should speed up the test as memcmp is most probably faster than going through the array (it's probably written in ASM). Which libc are you thinking of? I wouldn't mind taking a look at their implementation. GCC 8.2 created this convoluted memcmp from what I thought was a pretty straightforward...

Try downloading it again, I've hopefully fixed the issues. Here's my code. extern "C" { #include <gemdos.h> #include <libc.h> } #define BUFFER_SIZE 512 #define BUFFER_REPEATS 100000 uint8_t buffer[BUFFER_SIZE]; uint8_t read_buffer[BUFFER_SIZE]; void check_error(int condition, const char *message) { ...

Oh crap! Something's seriously wrong with my error message these. To be honest with you I didn't actually test the failure part, since it was getting quite late.

Great! Glad I could save you some time

I ported it to C. Apparently the reads and writes take about the same amount of time, but the comparison takes aaaaaaaaaages. I sped it up slightly by using 0-255 as the filler data instead of a string. So I can just check each byte against the byte count, which is quicker than comparing two memory ...

...I haven't actually tested the video modes yet (doing that next), but I put new ROMs up anyway. They're in the usual place. The new versions are v4.1 for V4 boards and V5.1 for V5 boards. Be sure to use the right one, or it won't boot