thank you =)
a guy has proposed me a very pretty exchange: his Acorn RiscPC/Arm-610 machine for my "strange" 68K linux pizza box, and i am really thinking it would be a very nice exchange. His machine is missing the lan, but it's not a problem, i can find one.
No decision taken yet, but i have to confess i am really tempted to accept the exchange.
@foetz
i have never seen the earlier SGI 68k line, i have few informations about them, but …. about m68k I have designed an home-made 68k-board, also trying to adapt a box-case (IBM S/370 CRT-Terminal). I't not completed yet, also the firmware needs more improvement, it has 2 big NVram for the storage (non volatile memory, it stores things when you switch the PSU off) but currently the firmware boots an
interpreter
(released as open sources) i have coded it in order to pass my university homework, and which looks like "pascal". Well, if pascal hadn't procedures
Sorry about that, i am still having limited capability about designing an interpreter, i am still having lessons about (computer science, "compiler and interpreters" courses), it may be i will learn, actually it has no procedures, just the "main", even if it's able to do this:
Code:
Select all
_______________________
< Have you mooed today? >
-----------------------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
MC68060 VME SMP
my 68K-home board machine is a pretty common design in where you have all devices attached to the CPU bus, no DMA, and just a few interrupt driven devices (e.g. the ACIA, uart, and the PIT, which is used as timer and could be used for "tick" generator in order to schedule things). Nothing special in this design, everything looks very easy, while the board in the picture looks much more interesting !
That's MC68060 VME SMP made by "Eltec". There are other companies that used the Eltec board, and they do "embroidery machines", but we are talking about bit-industrial embroidery machines, something that need "hard real time" processing, so the board i got from ebay dot com looks more interesting.
The board has two big 68060 CPUs @ 50Mhz, and a pretty amount of "shared ram", something like "dual port" ram, but it also have 2 engines that perform DMA and "mail boxes". Each CPU has a private space, and can access the "partner" space in two way: -1- accessing the share ram (which is also semaphored), and -2- trapping a mail into the partner mail-box, this is the full interrupt driven way. DMA works in the background, has 4 channels, and can move stream from and to the VME bus.
Very amazing design, and VxWorks v5 is running, i have seen it on the serial console. I had to hack it a bit, adding a VME backplane in order to power to board, and reversing the console to wire out a connector in order to access the console. Lately I got a pretty documentation, thanks to Eltec, which has provided me 2 big pdf