On Wed, Nov 4, 2015 at 3:07 PM, Kevin Monceaux <Kevin at rawfeddogs.net> wrote: Here I was thinking Lower Alabama... Kyle

On 11/5/15 2:47 PM, Mark J. Blair wrote: http://www.angelectronics.org/ Mike should be able to confirm it

On 11/5/15 3:19 PM, Mike Ross wrote: http://www.vintage-computer.com/vcforum/showthread.php?36875-Molecular-Comp… http://www.vintage-computer.com/vcforum/showthread.php?48531-DG-Nova/page2

Are you near Riverside? If not, maybe I can help you out with this machine somehow. It is local to me, and I happen to have a couple weeks of free time between jobs.

On 11/5/15 6:39 PM, Mark J. Blair wrote: Cool! I haven't seen those internals for a long time. System/23 was the first product I worked on at IBM (wrote about 20% of the total ROM code for it). If anyone knows where one is for a "reasonable" amount, I'd be interested mainly for nostalgia reasons. ;-) Some interesting facts: * The IBM 5120 (follow on to the 5110) used the same "skins" as the System/23. That was because (for a number of reasons) System/23 was late and IBM wanted something in the market and the 5110 was getting a bit long in the tooth. So when IBM decided to repackage the 5110 they used the already existing skins for the System/23. * The expansion bus in the IBM PC was the same bus as the System/23. The connector was rotated 180* so that some of the less expensive cards from the PC couldn't be used in the System/23. The other reason for this was since the IBM PC was done on a "shoe string" budget, they could take the System/23 cards and only had to do some minimal re-layout of the board. TTFN - Guy

Yes. I wasn?t really involved in the HW side of things but I think it was because it was ?easier?. I think at least one device just generated a pulse for an interrupt rather than having some sort of latch. TTFN - Guy

I've seen it, and it is for real. Looks complete except for missing paper rack on the back. Has keyswitch and band printer options. More details and a blog post with pictures to follow once I'm back home in front of a real computer. For now, I've posted a few pictures on my Twitter feed (@nf6x).

Wow that looks to be in fantastic condition considering its around 40 years old now! I really wish the best of luck to whomever gets it. I must say I'm very jealous ;) -Connor K On 11/9/2015 9:20 PM, Mark J. Blair wrote:

Shipping something like that to NZ must cost a fortune! I was surprised how much it cost me to ship a Timex-Sinclair TS-2068 back to its owner in Canada today, and it's just a bit smaller. ;) Anyway, after looking at it, I'd say that it's worthy of your attention if you would like to add another one to your fantastic collection. It looks to me like it'll clean up nicely. Let me know if you would like to meet for a cup of coffee while you're in the area. I might have to be in the office in Irvine, but there's a good chance that I'll be available this week. -- Mark J. Blair, NF6X <nf6x at nf6x.net> http://www.nf6x.net/

On 2015-11-09 10:53 PM, Connor Krukosky wrote: That big disk is nearly bullet proof, we had one in a store controller where they had a fire in the store and the fire got close enough to it to scorch the paint on the covers, but the drive still worked and all the data was recovered off of it. They do however sometimes squeak a little when they seek. For the burn in on the CRT, only half of the CRT is used so you can rotate it 180 degrees if that has not already been done. That also works for 3741 key to diskette machine, same display unit. The orange plastic box inside the cardboard box contains a head alignment tool for the 33FD diskette unit. One thing that may go wrong with the diskette drives is the lower limit stop on the head carriage may break off and allow it to go below track 0. These drives do not have a track 0 sensor so when they are initialized the drive does about 80 out steps to make sure it is at zero so it hammers on that down stop. and it is plastic so it won't get better with age. On the disk drive there is a head lock back top left should be locked when moving and I believe there is also a spindle lock. Those little cards in the envelopes may have been used for indicator cards or probing. I seem to remember that the service guide sat in the space just above the logic gate, but I don't see it in the pictures. Paul.

I just emailed the seller of this system to see if it has been purchased yet. They say it's still available, and they're thinking of putting it on eBay. -- Mark J. Blair, NF6X <nf6x at nf6x.net> http://www.nf6x.net/

On 11/9/15 7:31 PM, Eric Smith wrote: Oh, trust me I know about the edge triggered interrupt problem. I was trying to support a "simple" multi-com board for Xenix/286 on the PC-AT and just couldn't make it work properly with edge triggered interrupts. One of the things that the MCA in the PS/2's did was to do away with edge triggered interrupts...they were all level. A number of us demanded that of the new bus. Of course we didn't get the most important thing right (configurability) but we were constrained by being able to take existing designs and just "tweak" them in order to make them MCA boards. The 8259 (along with the damned 8254) are still alive and well in current Intel PCHs. The current (Skylake) generation of CPUs and PCHs still have them. :-( Actually as of Windows 8.x the 8254 is *still* used. :-( TTFN - Guy

He is tonight going thru LAX Mike is in New Zealand. I'm in Orange, Ca and can help out with things in this area too. Thanks Jim On 11/5/2015 4:52 PM, Mark J. Blair wrote:

On 11/5/2015 10:55 PM, Mark J. Blair wrote: Or tipped on end such that it would fit, similar to moving a sofa. JRJ

On 11/6/2015 8:01 PM, Mark J. Blair wrote: I get it - just like my basement is full.... :)

I have mixed feelings about whether I should hope that they were careful enough to design cabinets to fit in a standard doublewide trailer's kitchen. ;) Exactly! :) -- Mark J. Blair, NF6X <nf6x at nf6x.net> http://www.nf6x.net/

On 11/9/15 11:46 AM, Mark J. Blair wrote: And so far, it's still priceless.