On 13 December 2016 at 10:34, R.S. <r.skoru...@bremultibank.com.pl> wrote:
> I dare to disagree. My turn... > Although MP3000 was better than MP2000, it was still nothing good. It was *much* better than the MP2000. Very much faster. It was a 390 G5 CPU. Even 2 x G5 on the top model (H50). A note on the "development only" idea about this machine. There *were* development (PWD) models. We had one, at a much reduced price, and we also had a free "Linux option" that kept the model number unchanged (P30), but doubled the CPU speed and doubled the memory. IIRC the non-PWD models were H30 and H50. > As a demonstration/learning/portable machine it was much to big. Sure. The old P390s were about the best for that. But you could always connect remotely. > As a production or development machine the I/O was really poor. Well... Don't mix the two kinds of I/O. There was the P390/Integrated Server style of I/O, all done by OS/2 through the (16-bit!) drivers taken unchanged from the P390. This was used for OS/2's own purposes (C drive, etc.) and it was possible to map emulated 390 DASD to OS/2 files on this space, exactly as on P390. But the "real" DASD I/O was via an STI cable from the G5 CPU to a PCI card on the passive backplane. The array of SSA drives connected to the same PCI bus, and that I/O was done with no involvement of OS/2 or even the Intel CPU. > No real channels except ESCON. There was a parallel channel, but IIRC not supported for DASD. Tape and UR only. But did you really have old DASD that you wanted to connect via Bus & Tag? Maybe a 3380... > No sysplex capability. A lot of SPOFs. Yes - SPOF were a problem for a production shop. Though OS/2 could crash and be rebooted without crashing the G5. But who wants Sysplex on a machine that size, except a development shop (ISV)? > z800 and followers were not much more expensive, but it's functionality was > significantly better. z800 + DASD + network interface + TN3270/console support of some kind came out to a lot more money. But of course speed of a 64-bit program on the MP3000 = 0 MIPS... Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
