On 4/2/25 13:49, Jon Elson wrote:
On 4/2/25 09:05, Dave Engvall wrote:
Me thinks we are in trouble. Some room on 40 Mb disk. 320 Kb memory
OH MY!!! That is going to be a big problem! I ran an old (was it
2.5?) LinuxCNC on a machine with 512 Kb memory, and it was VERY
sluggish to start any programs, like an editor. 40 MB disk??? Yeesh,
where would you ever find one? Is that MFM? Even 40Gb is really old
stuff. I am running Windows 95 on a vintage 2000 pick and place
machine, the BIOS would not recognize disks above 32 GB, but I found a
PATA drive with the "clip" feature that makes the drive report a size
of 32 Gb (even though the drive has a total capacity 80 Gb).
And that is 32 times the capacity of 2 scsi-ii drives on the machine
that taught me about computing. That has some trickery in the random
file manager, which originally had a hard drive capacity limit of 132
megs due to the fixed size of its File Allocation Table, but we managed
to figure out how to make each bit in that table represent more than one
sector. But even then the disk bandwidth was the speed limit as a move 4
bytes wide was done in software. Read 4 bytes at 1.78 mhz, write 4 bytes
at 1.78 mhz. repeat till done. Sadly, tired electrolytic caps now crash
it. Now i'm setting up a bananapi-m5, using usb3.1 to sata-iii adaptors
to a stack of 4T SSD's that can for short files, move data at 500+ megs
a second. This is nearly the speed of the pi image I sent you, Dave. The
difference is that all 4 usb ports on the bananapi-m5 are usb3.1. On a
real rpi4b, 2 of the 4 are usb2.0.
That STG card sounds like magic. So the question is, does anybody have
the src code for that driver? Recompiling it to run on arm64 might be
an amazing thing. Professor Bertho S. possible??? Or already done?
Jon
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