Armin, I'm looping Al Kossow in on this and will put the data aside somewhere, since I want to get names and dates of the history of Basic 4, and have him have it for the CHM records. further comments inline below thanks jim On 6/7/2014 3:08 PM, Armin Diehl wrote: The disk drives look to be CDC like the 80mb used on the DEc systems. SMD

let me look at the manual up uploaded. See below on the PSU. The guys at b4 did their own hardware after buying 1600's thru about 1976 or into 77. I think this (in fact I know) this is their own doing.

I interviewed with B4 for a position doing the design of some of the I/O since I had had 3 years working with the 1600 in school. Microdata was having a rocky road, and at the time was not treating us well. Phil Ramazina? I think was the director of Engineering and was not too happy with me to turn him down at the time. My heart was in firmware, and not in the hardware, and they had two firmware gurus at the time. We later hired the main one, Peter something who got pissed off at them at microdata, and he actually went into the mainframe software business and made a company that sold out for millions. I need to ask a buddy who worked with him his name and history and get it written down somewhere.

By this time they may have gone to Pioneer or other switchers. i doubt it has the MD linear, but you can send a photo. You will probably need to load it if you can pull it from the cpu and bring it up. The supply voltages I rattled off, +5, +12, -12, -16.75 may also have a -5 depending on the Cmos parts used for the memory. If you have occasion to pull the mos memory board, get the part and check. I suspect you may have a -5 rail if it is the common parts out then. You can use your own judgment on whether you need to be that cautious.

I appreciate that, I will take a look at the scan and see what it looks like.

might be. The processor you sent photos of are certainly a follow on. I'll write up and send a description of the history of the firmware. IT turns out it was an upgraded version of the original firmware I used in college, the 1621.

> > On 06/03/2014 01:38 AM, jim stephens wrote: >> Armin, >> the power supply info for this system is in the back pages of the >> Logic manual. Though it claims to be the "logic" it is actually >> the main manual for the whole system >> >> I think the regulator was the same for both the 20 and 40 amp >> systems, with the actual logic to regulate the power being separate >> from the board which regulated the voltages. I don't have systems >> handy to check this. >> >> all of my 1600's have internal power supplies which fit into the >> left end of the backplane and use a shorter backplane. You probably >> have a system with a power supply which is either about 8" or about >> 14 or 15" high rack mounted on the back. If it is rack mounted on >> the back, the smaller of the two is the 20 amp, and the larger is 40 >> amp. >> >> This refers to the rating of the 5v supply. the -16.75, -12, and >> +12 are all the same rating, only the 5v to supply increased amount >> of TTL logic was upgraded. If you used the other voltages, you had >> to supply the extra power from a separate supply, and the Basic 4 >> systems didn't have any such need. >> >> thanks >> Jim >> >> http://bitsavers.informatik.uni-stuttgart.de/pdf/microdata/1600/1600_Logic_… >> >> >> >> >> On Thu, May 29, 2014 at 6:13 AM, Armin Diehl <ad at ardiehl.de >> <mailto:ad at ardiehl.de>> wrote: >> >> Hi, >> >> yesterday i got a complete MAI Basic Four 510, similar to the >> 610/730 including 2 14" removable disk drives including a lot of >> disk packs. Due to the size i have yet transported one drive, the >> printer, terminals, disk packs and the documentation only. I have >> to pick up the CPU, the 2nd drive and the remaining stuff over the >> next weeks. >> Now i'm looking for the service manual since there seems to be a >> defect in the cpu power supply, the main fuse is blowed: >> >> M8001XX System 610/730 Service Manual >> >> Anyone out there having these or similar manuals ? >> >> These ones would also be very interesting: >> >> M80651A System 1350 Service Manual, Vol I >> M80652A System 1350 Service Manual, Vol II >> M80781A System 1600 Service Manual, Vol I >> M80782A System 1600 Service Manual, Vol II >> >> The new ones i got (Disk service manual and owners manual for the >> 610/730) will be scanned and send to Al within the next weeks. >> >> Thanks >> >> ---------------- >> Gr?sse >> Armin Diehl >> ad at ardiehl.de <mailto:ad at ardiehl.de> >> >> > >