Re: Anyone know where uPD2167 SRAMs appeared?
On Tue, Oct 9, 2018 at 9:07 PM Chuck Guzis via cctalk wrote: > On 10/09/2018 05:13 PM, Ethan Dicks via cctalk wrote: > > > I asked a version of this question earlier this year. I have not been > > able to find any vintage machines that used these 16Kx1 55ns SRAMs. > > Anyone recognize them? > > Same as the Intel 2167, or InMOS 1403, no? The same. > Like most SRAM of the time, kind of power-hungry (180 ma @ 5V is about a watt > per chip) Yep. > I've got a pile of the InMOS variety, scavenged from a Eurobus design of > some sort. I have a pile too and no machines (that I know of) that use them. A bin of PDIP from a former employer and a stack of ceramic parts from a large mixed assortment. If I find out they appeared in a machine I might want someday I'd be inclined to keep them. Otherwise, they go, one way or another. -ethan > --Chuck > > >
Re: Anyone know where uPD2167 SRAMs appeared?
On Tue, Oct 9, 2018 at 5:14 PM Ethan Dicks via cctalk wrote: > > There's little point in wiring 8 of them up into a byte vs using a > 62256 except for speed. 55ns is faster than any 8MHz machine really > needs (100ns-150ns was typical for those depending on bus > architecture). I could see these being cache RAM for a minicomputer > vs primary RAM. Or maybe used as writable microcode control store? Although as x1 parts there would probably need to be a large number of them in parallel for microcode control store. For example the HP 1000 A900 12205 control store option from the early 1980s used the same 16K density and 55ns speed INMOS IMS1420 SRAM chips, but in a 4Kx4 organization, using 12 of them for a 48-bit wide microcode word. That would take up a lot of board space using x1 parts.
Re: Anyone know where uPD2167 SRAMs appeared?
On 10/09/2018 05:13 PM, Ethan Dicks via cctalk wrote: > I asked a version of this question earlier this year. I have not been > able to find any vintage machines that used these 16Kx1 55ns SRAMs. > Anyone recognize them? Lots of them for sale on eBay. Probably few > buyers. One would want to know which systems used them, thus my > question. Same as the Intel 2167, or InMOS 1403, no? Like most SRAM of the time, kind of power-hungry (180 ma @ 5V is about a watt per chip. I've got a pile of the InMOS variety, scavenged from a Eurobus design of some sort. --Chuck
Re: Anyone know where uPD2167 SRAMs appeared?
On Tue, Oct 9, 2018 at 5:14 PM Ethan Dicks via cctalk wrote: > Hi, All, > > I asked a version of this question earlier this year. I have not been > able to find any vintage machines that used these 16Kx1 55ns SRAMs. > Anyone recognize them? Lots of them for sale on eBay. Probably few > buyers. One would want to know which systems used them, thus my > question. > > They probably would have been excellent in a DEC MOS memory board but > I have no evidence they were used thusly. Contemporary DRAMs were > cheap and 64Kx1 so that's what was in consumer gear. > > Anyone? Fast SRAM? Anywhere? > The Three Rivers PERQ used 48 of them for microcode store in the 16K CPU, and on the Z80-based IO Processor. (I suspect the IO Processor didn't need RAMs quite that fast, but 3RCC probably had a lot of them on hand due to their use in the main CPU...) - Josh > > There's little point in wiring 8 of them up into a byte vs using a > 62256 except for speed. 55ns is faster than any 8MHz machine really > needs (100ns-150ns was typical for those depending on bus > architecture). I could see these being cache RAM for a minicomputer > vs primary RAM. > > -ethan >
Anyone know where uPD2167 SRAMs appeared?
Hi, All, I asked a version of this question earlier this year. I have not been able to find any vintage machines that used these 16Kx1 55ns SRAMs. Anyone recognize them? Lots of them for sale on eBay. Probably few buyers. One would want to know which systems used them, thus my question. They probably would have been excellent in a DEC MOS memory board but I have no evidence they were used thusly. Contemporary DRAMs were cheap and 64Kx1 so that's what was in consumer gear. Anyone? Fast SRAM? Anywhere? There's little point in wiring 8 of them up into a byte vs using a 62256 except for speed. 55ns is faster than any 8MHz machine really needs (100ns-150ns was typical for those depending on bus architecture). I could see these being cache RAM for a minicomputer vs primary RAM. -ethan
Re: BPK-72 or Bubble Memory Dummy Module + Seed Module
CHM has these in their collection. Where are you located at? They don't look really complicated. I'd think one could make one if they had a schematic. Dwight From: cctalk on behalf of Josh via cctalk Sent: Monday, October 8, 2018 9:42:22 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: WTB: BPK-72 or Bubble Memory Dummy Module + Seed Module Currently working on restoring some bubble memories and I'm looking for some modules originally included in Intel's BPK-72 development kit, specifically the Dummy Load module and the Seed module. http://archive.computerhistory.org/resources/still-image/Intel/intel.dummy_seed_modules.102652232.lg.jpg These are used for testing a bubble memory system as well as repairing bubble modules which have had some sort of failure which requires manually re-seeding them. I have all the parts I need to work with the modules, I'm just missing these parts. The manual shows the schematics, component values, and layouts of both of these modules, so I can fabricate them myself if need be, but wanted to see if anyone had them handy first. Thank you again! Josh
Re: WTB: BA11-K Rack Rails
On Tue, Oct 9, 2018 at 8:19 AM Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote: > > From: Paul Anderson > > > I don't remember the D tilting. > > http://gunkies.org/wiki/File:BA11-DSide.jpg > > This is very similar to the slides on the BA11 (-11/20), which also had the > rotation, so I suspect they were all this way (i.e. there no early versions > without, etc). Having said that, if anyone has a -D with something else, > please send me an image so I can document it. > > > > From: systems_glitch > > > I'd prefer a set of original outer rails, but something newer or > > something I have to modify a little would be fine. > > Probably the easiest option is to buy a set of those C-230-S's; the > mounting > holes on their inners match the locations of the swage nuts on the BA11-K > sides, so it's straight simple bolt-in. You'll lose the rotations option, > though. > > > https://www.newark.com/general-devices/c-230-s-122/telescoping-slide-26in-steel/dp/51F4052
Re: dmk to imd problem
On 10/9/18 12:39 AM, Fritz Chwolka via cctalk wrote: Hi, I have a lot of dmk images and tried to convert them to imd with dmk2imd.com. try the conversion in the HcX utility
Re: WTB: BA11-K Rack Rails
> From: Paul Anderson > I don't remember the D tilting. http://gunkies.org/wiki/File:BA11-DSide.jpg This is very similar to the slides on the BA11 (-11/20), which also had the rotation, so I suspect they were all this way (i.e. there no early versions without, etc). Having said that, if anyone has a -D with something else, please send me an image so I can document it. > From: systems_glitch > I'd prefer a set of original outer rails, but something newer or > something I have to modify a little would be fine. Probably the easiest option is to buy a set of those C-230-S's; the mounting holes on their inners match the locations of the swage nuts on the BA11-K sides, so it's straight simple bolt-in. You'll lose the rotations option, though. Noel
dmk to imd problem
Hi, I have a lot of dmk images and tried to convert them to imd with dmk2imd.com. Trying with on of those files: http://oldcomputers-ddns.org/public/pub/rechner/eaca/genie_3s/my_genie_3s/image/fritz/cpm/g3s_f01.dmk The conversion was fast and told me: Tracks:80x6528 DSSD Assuming 500kbps data rate. But when I write the *.imd to floppy I get only 40track and that is realy not good. :-( -- Best Regards, mit freundlichen Grüßen Fritz Chwolka
