Building a BA08 for a pdp8/L
So now that my pdp8/L is up and running (it now has a serial port and runs FOCAL69 quite well) I'm thinking about the next step, which is of course more memory. This requires a BA08 or BM8/L or something expansion box but to be honest I have enough spare flip chips and such from the wrecked 8/I to build about 3 core memory systems. So given that the schematics for the BA08 are online, they look pretty darn simple, I have the parts, and I have the parts does anyone know if it's possible to get a flip chip backplane to work on and wire up to emulate a BA08? It looks like they just used the data break interface lines to hook up to the processor. Everything's there, Memory address bus, memory data bus, and the various signals for jumps and the like that could allow one to decode and implement the extra instructions needed. Hm. Might just be easier to build it with an FPGA or something as it's mostly linking up simple gates and the whole core memory section could be removed by a 4k*12 memory array. Anyone ever done this? C
Re: seeking Motorola M68MM01A2 documentation
> He has a lot of Exorciser boards and manuals to scan so I will let him > step forward when he's ready for that. But I do greatly appreciate > getting this manual. Nice! Looking forward to that manual dump when it does happen. I haven't done a ton with EXORbus due to the lack of documentation...it keeps me from buying more stuff I'd otherwise have to reverse engineer. > I think Jos' TEK_BB SBC will be the winning solution and thanks to Jos > for sharing it and Jonathan for running with it. This way many people can > run Altair 680 or SWTPC 6800 code on a small footprint development board. It does look like just the thing for a right-now easy solution! I'll probably still move forward on especially the compatible Glitchbus board set, but not as urgently :P Thanks, Jonathan
Re: seeking Motorola M68MM01A2 documentation
> Excellent information Jonathan! Glad to share! I get the impression that people often think I'm on some ideological soapbox when I tell them not to use $flybynite_pcb but really there are big differences in quality. > I generally carry the s100computers and many RetroBrew board Thank *you* for helping keep cool projects stocked and available! I know I've ordered a few things from you after the N8VEM->RetroBrew change. Thanks, Jonathan
Re: AOL diskettes
On Wed, Jan 19, 2022, 5:00 AM Peter Corlett via cctalk < cctalk@classiccmp.org> wrote: > >> https://www.thisiswhyimbroke.com/floppy-disk-table/ > > I like it! > > The ratios are wrong: it's about twice as thick as it ought to be. It's > apparently been designed by somebody who has seen a picture of a floppy but > never used one. > One might even say.. it's double density. (I'll see myself out) >
Re: seeking Motorola M68MM01A2 documentation
And just to close the loop on the original documentation request-- someone has come forward with the exact manual for the M68MM01A2 board and I very much appreciate that. He has a lot of Exorciser boards and manuals to scan so I will let him step forward when he's ready for that. But I do greatly appreciate getting this manual. I think Jos' TEK_BB SBC will be the winning solution and thanks to Jos for sharing it and Jonathan for running with it. This way many people can run Altair 680 or SWTPC 6800 code on a small footprint development board. Chris On Wednesday (01/19/2022 at 01:25PM -0500), Todd Goodman via cctalk wrote: > Excellent information Jonathan! > > I generally carry the s100computers and many RetroBrew board and have > ordered over 5000 boards from PCBCart.com > > I'm not a board designer but if people have any questions about PCB Cart and > the board ordering process, feel free to contact me privately. > > Todd > > On 1/19/2022 1:14 PM, Jonathan Chapman via cctalk wrote: > > Mike, > > > > We use PCB Cart for boards with hard gold edge contacts, like our DEC > > prototyping board, Apple II protoboard, XT-IDE, etc. They are the same > > Chinese board house used by s100computers.com and N8VEM/RetroBrew > > Computers. Results are pretty good for the price. > > > > Expect to order 25 to make hard gold edge plating worthwhile. It'll pretty > > much double the price of the board, but PCB Cart does proper selective hard > > gold, not "heavy ENIG" (not a thing) or some other nonsense. A lot of the > > cheaper places will only plate "hard gold" over ENIG, which I assume means > > they don't actually have a selective process at all. > > > > Make sure to specify an edge chamfer if it's a typical card edge connector, > > otherwise it'll be routed square and a little difficult to insert/you'll > > have to dress it down with a file. > > > > If practical for the board, remove unused contacts from the edge connector. > > They charge per-contact as a way to guesstimate their gold costs. > > > > Thanks, > > Jonathan > > > > ‐‐‐ Original Message ‐‐‐ > > > > On Wednesday, January 19th, 2022 at 12:05, Mike Katz via cctalk > > wrote: > > > > > Johnathan, > > > > > > I saw you will be ordering boards pretty soon. > > > > > > I need to order some boards for my PDP-8/E but I've never ordered boards > > > > > > before. > > > > > > What board house do you use? Have you ever specified gold fingers before? > > > > > > Any advice would be greatly appreciated. > > > > > > Thanks, > > > > > > Mike > > > > > > +1 (773) 414-1044 > > > > > > On 1/19/2022 9:49 AM, Jonathan Chapman via cctalk wrote: > > > > > > > Chris, > > > > > > > > I'm probably going to order some of these on my next circuit board > > > > order (this week or next), do you want a set of them? Seems they are of > > > > course "hacking required," which is fine by me :P > > > > > > > > Thanks, > > > > > > > > Jonathan > > > > > > > > ‐‐‐ Original Message ‐‐‐ > > > > > > > > On Wednesday, January 19th, 2022 at 10:24, Chris Elmquist via cctalk > > > > cctalk@classiccmp.org wrote: > > > > > > > > > On Wednesday (01/19/2022 at 03:35PM +0100), Jos Dreesen via cctalk > > > > > wrote: > > > > > > > > > > > On 19.01.22 13:15, Jonathan Chapman via cctalk wrote: > > > > > > > > > > > > > That's a neat board! Where can I/we order one? > > > > > > > > > > > > > > With me... > > > > > > 20 Eur for the set of 2 + shipping. > > > > > > > > > > > > If you are in the US it is probably cheaper to order new ones > > > > > > locally. > > > > > > > > > > > > Note that I never completed the documentation or wrote the code for > > > > > > the hex keyboard. > > > > > > > > > > > > But it does run the Tektronix board-bucket BASIC via serial port ! > > > > > > > > > > > > Find more on ftp://ftp.dreesen.ch/TEK_BB > > > > > > > > > > > > ah ha! that's what I was looking for. Will check it out in detail. > > > > > I think I am "forum challenged" as all I could see at the original > > > > > link > > > > > > > > > > were renderings of the board. > > > > > > > > > > Thanks Jos. Maybe this will be the ticket... > > > > > > > > > > Chris > > > > > > > > > > Chris Elmquist -- Chris Elmquist
Re: seeking Motorola M68MM01A2 documentation
Excellent information Jonathan! I generally carry the s100computers and many RetroBrew board and have ordered over 5000 boards from PCBCart.com I'm not a board designer but if people have any questions about PCB Cart and the board ordering process, feel free to contact me privately. Todd On 1/19/2022 1:14 PM, Jonathan Chapman via cctalk wrote: Mike, We use PCB Cart for boards with hard gold edge contacts, like our DEC prototyping board, Apple II protoboard, XT-IDE, etc. They are the same Chinese board house used by s100computers.com and N8VEM/RetroBrew Computers. Results are pretty good for the price. Expect to order 25 to make hard gold edge plating worthwhile. It'll pretty much double the price of the board, but PCB Cart does proper selective hard gold, not "heavy ENIG" (not a thing) or some other nonsense. A lot of the cheaper places will only plate "hard gold" over ENIG, which I assume means they don't actually have a selective process at all. Make sure to specify an edge chamfer if it's a typical card edge connector, otherwise it'll be routed square and a little difficult to insert/you'll have to dress it down with a file. If practical for the board, remove unused contacts from the edge connector. They charge per-contact as a way to guesstimate their gold costs. Thanks, Jonathan ‐‐‐ Original Message ‐‐‐ On Wednesday, January 19th, 2022 at 12:05, Mike Katz via cctalk wrote: Johnathan, I saw you will be ordering boards pretty soon. I need to order some boards for my PDP-8/E but I've never ordered boards before. What board house do you use? Have you ever specified gold fingers before? Any advice would be greatly appreciated. Thanks, Mike +1 (773) 414-1044 On 1/19/2022 9:49 AM, Jonathan Chapman via cctalk wrote: Chris, I'm probably going to order some of these on my next circuit board order (this week or next), do you want a set of them? Seems they are of course "hacking required," which is fine by me :P Thanks, Jonathan ‐‐‐ Original Message ‐‐‐ On Wednesday, January 19th, 2022 at 10:24, Chris Elmquist via cctalk cctalk@classiccmp.org wrote: On Wednesday (01/19/2022 at 03:35PM +0100), Jos Dreesen via cctalk wrote: On 19.01.22 13:15, Jonathan Chapman via cctalk wrote: That's a neat board! Where can I/we order one? With me... 20 Eur for the set of 2 + shipping. If you are in the US it is probably cheaper to order new ones locally. Note that I never completed the documentation or wrote the code for the hex keyboard. But it does run the Tektronix board-bucket BASIC via serial port ! Find more on ftp://ftp.dreesen.ch/TEK_BB ah ha! that's what I was looking for. Will check it out in detail. I think I am "forum challenged" as all I could see at the original link were renderings of the board. Thanks Jos. Maybe this will be the ticket... Chris Chris Elmquist
Re: seeking Motorola M68MM01A2 documentation
Mike, We use PCB Cart for boards with hard gold edge contacts, like our DEC prototyping board, Apple II protoboard, XT-IDE, etc. They are the same Chinese board house used by s100computers.com and N8VEM/RetroBrew Computers. Results are pretty good for the price. Expect to order 25 to make hard gold edge plating worthwhile. It'll pretty much double the price of the board, but PCB Cart does proper selective hard gold, not "heavy ENIG" (not a thing) or some other nonsense. A lot of the cheaper places will only plate "hard gold" over ENIG, which I assume means they don't actually have a selective process at all. Make sure to specify an edge chamfer if it's a typical card edge connector, otherwise it'll be routed square and a little difficult to insert/you'll have to dress it down with a file. If practical for the board, remove unused contacts from the edge connector. They charge per-contact as a way to guesstimate their gold costs. Thanks, Jonathan ‐‐‐ Original Message ‐‐‐ On Wednesday, January 19th, 2022 at 12:05, Mike Katz via cctalk wrote: > Johnathan, > > I saw you will be ordering boards pretty soon. > > I need to order some boards for my PDP-8/E but I've never ordered boards > > before. > > What board house do you use? Have you ever specified gold fingers before? > > Any advice would be greatly appreciated. > > Thanks, > > Mike > > +1 (773) 414-1044 > > On 1/19/2022 9:49 AM, Jonathan Chapman via cctalk wrote: > > > Chris, > > > > I'm probably going to order some of these on my next circuit board order > > (this week or next), do you want a set of them? Seems they are of course > > "hacking required," which is fine by me :P > > > > Thanks, > > > > Jonathan > > > > ‐‐‐ Original Message ‐‐‐ > > > > On Wednesday, January 19th, 2022 at 10:24, Chris Elmquist via cctalk > > cctalk@classiccmp.org wrote: > > > > > On Wednesday (01/19/2022 at 03:35PM +0100), Jos Dreesen via cctalk wrote: > > > > > > > On 19.01.22 13:15, Jonathan Chapman via cctalk wrote: > > > > > > > > > That's a neat board! Where can I/we order one? > > > > > > > > > > With me... > > > > > > > > 20 Eur for the set of 2 + shipping. > > > > > > > > If you are in the US it is probably cheaper to order new ones locally. > > > > > > > > Note that I never completed the documentation or wrote the code for the > > > > hex keyboard. > > > > > > > > But it does run the Tektronix board-bucket BASIC via serial port ! > > > > > > > > Find more on ftp://ftp.dreesen.ch/TEK_BB > > > > > > > > ah ha! that's what I was looking for. Will check it out in detail. > > > > > > I think I am "forum challenged" as all I could see at the original link > > > > > > were renderings of the board. > > > > > > Thanks Jos. Maybe this will be the ticket... > > > > > > Chris > > > > > > Chris Elmquist
Re: AOL diskettes
On Wed, 19 Jan 2022 at 12:00, Peter Corlett via cctalk wrote: > > Get a LACK table from IKEA (€6.99) Speaking of LACK, I guess most people might know this, but it's the same size as a standard 19" rack and can be used to hold rackmount kit. https://wiki.eth0.nl/index.php/LackRack This may be best employed in the home if you are deaf or hard-of-hearing, though, from my own experience of rackmount servers on the coffee table... -- Liam Proven ~ Profile: https://about.me/liamproven Email: lpro...@cix.co.uk ~ gMail/gTalk/FB: lpro...@gmail.com Twitter/LinkedIn: lproven ~ Skype: liamproven UK: (+44) 7939-087884 ~ Czech [+ WhatsApp/Telegram/Signal]: (+420) 702-829-053
Re: AOL diskettes
On Wed, 19 Jan 2022 at 16:59, Peter Coghlan via cctalk wrote: > > (BTW, trying to contact IKEA to get it sorted was very much like trying to > contact Google except that Google doesn't have sacrificial call centre workers > in a different country to intercept the complaints and lose them, Google just > doesn't take calls from anyone.) Actually, I feel a strange and atypical urge to defend IKEA here. I bought a 2nd hand IKEA bed off some chap on Fesse Bouc a few years ago. He said his girlfriend didn't like it and it gave her back ache. It was partly disassembled. When I came to rebuilt it, using a PDF of the instructions from the WWW, I discovered an important screw was missing. I went to my local IKEA, showed them the pic and the name of the bed, and they just gave me the right screw, free of charge for a 2nd hand item. When I came to assemble the bed, I discovered that the fool had assembled it wrongly in the first place and used the "missing" bolt in the wrong hole, making the whole frame slightly twisted and that's probably why his G/F didn't like it. But kudos to IKEA who publish the instructions for free online, facilitating the 2nd hand market, and to their after-care which includes no-questions-asked parts even for later owners. They also swapped a backpack of mine when a critical zip failed, even though I bought it in a different country and had no receipt. I think maybe the thing is to go there, not try to phone them. -- Liam Proven ~ Profile: https://about.me/liamproven Email: lpro...@cix.co.uk ~ gMail/gTalk/FB: lpro...@gmail.com Twitter/LinkedIn: lproven ~ Skype: liamproven UK: (+44) 7939-087884 ~ Czech [+ WhatsApp/Telegram/Signal]: (+420) 702-829-053
IBM 6731 Diskette Module
Is anyone familiar with the IBM 6731 Diskette Module from around 1984 which gave the IBM Electronic 85 and 95 Selectric Typewriters the ability to store created documents to a 5.25" floppy diskette? There was also a 5.25" diskette which was nicknamed "IPL" for "initial program load", and an interface board which was installed into the typewriter and was referred to as the "IBM Typewriter Modularity Option". I do not have any images of the IBM 6731, but I do have an image capture from the installation and operations manual, posted here: https://www.dropbox.com/s/us8aely530s8p3a/6731diskettemodule.jpg?dl=0 You do not need a Dropbox account to view the image. Simply click on the X of the login pop up and it will disappear. Unfortunately, the only copy of this product manual I ever found was on eBay. I purchased it last month, paid USPS priority mail shipping with tracking and the post office lost it. :/ Thanks Don Resor
Re: seeking Motorola M68MM01A2 documentation
Johnathan, I saw you will be ordering boards pretty soon. I need to order some boards for my PDP-8/E but I've never ordered boards before. What board house do you use? Have you ever specified gold fingers before? Any advice would be greatly appreciated. Thanks, Mike +1 (773) 414-1044 On 1/19/2022 9:49 AM, Jonathan Chapman via cctalk wrote: Chris, I'm probably going to order some of these on my next circuit board order (this week or next), do you want a set of them? Seems they are of course "hacking required," which is fine by me :P Thanks, Jonathan ‐‐‐ Original Message ‐‐‐ On Wednesday, January 19th, 2022 at 10:24, Chris Elmquist via cctalk wrote: On Wednesday (01/19/2022 at 03:35PM +0100), Jos Dreesen via cctalk wrote: On 19.01.22 13:15, Jonathan Chapman via cctalk wrote: That's a neat board! Where can I/we order one? With me... 20 Eur for the set of 2 + shipping. If you are in the US it is probably cheaper to order new ones locally. Note that I never completed the documentation or wrote the code for the hex keyboard. But it does run the Tektronix board-bucket BASIC via serial port ! Find more on ftp://ftp.dreesen.ch/TEK_BB ah ha! that's what I was looking for. Will check it out in detail. I think I am "forum challenged" as all I could see at the original link were renderings of the board. Thanks Jos. Maybe this will be the ticket... Chris -- Chris Elmquist
Re: AOL diskettes
On Wed, 19 Jan 2022 at 12:00:33 +0100, Peter Corlett via cctalk wrote: >On Tue, Jan 18, 2022 at 04:47:36PM -0700, Grant Taylor via cctalk wrote: >> On 1/18/22 2:21 PM, Peter Coghlan via cctalk wrote: >>> https://www.thisiswhyimbroke.com/floppy-disk-table/ >> I like it! > > The ratios are wrong: it's about twice as thick as it ought to be. It's > apparently been designed by somebody who has seen a picture of a floppy but > never used one. > Maybe the idea is that when the top gets marked, you can sand it down and paint it again multiple times so you don't need to use those matching coasters that are so hard to get nowadays? > >> But I hate the price. > > Get a LACK table from IKEA (€6.99) and adorn it with 3D prints, or even old > floppies? I'd advise against trying to machine patterns into it though as > that low-end stuff is basically made of laminated cheese. > Peter, I'm shocked to see you recommend IKEA! Have you not suffered from (physical) IKEA catalogue spam the same way we have over here? (BTW, trying to contact IKEA to get it sorted was very much like trying to contact Google except that Google doesn't have sacrificial call centre workers in a different country to intercept the complaints and lose them, Google just doesn't take calls from anyone.) Regards, Peter Coghlan.
Re: IBM 6731 Diskette Module
My curiosity is “what kind” of boot program did they use, was it some sort of PC Dos incarnation? There’s very little info left in IBM’s archives. I also suppose the IBM Modularity option which plugs into the CPU board of the electronic typewriter, but that too is an educated guess on my part. Don Resor Sent from someone's iPhone > On Jan 19, 2022, at 7:32 AM, Peter Coghlan via cctalk > wrote: > > On Wed, 19 Jan 2022 at 04:06:59 -0800, D. Resor via cctalk wrote: >> >> There was also a 5.25" diskette which was nicknamed "IPL" for "initial >> program load", and an interface board which was installed into the >> typewriter and was referred to as the "IBM Typewriter Modularity Option". >> > > Hi Don, > > Apologies if you know this already but IPL / initial program load > is IBM-speak for "boot". > > Regards, > Peter Coghlan. >
Re: seeking Motorola M68MM01A2 documentation
Chris, I'm probably going to order some of these on my next circuit board order (this week or next), do you want a set of them? Seems they are of course "hacking required," which is fine by me :P Thanks, Jonathan ‐‐‐ Original Message ‐‐‐ On Wednesday, January 19th, 2022 at 10:24, Chris Elmquist via cctalk wrote: > On Wednesday (01/19/2022 at 03:35PM +0100), Jos Dreesen via cctalk wrote: > > > On 19.01.22 13:15, Jonathan Chapman via cctalk wrote: > > > > > That's a neat board! Where can I/we order one? > > > > With me... > > > > 20 Eur for the set of 2 + shipping. > > > > If you are in the US it is probably cheaper to order new ones locally. > > > > Note that I never completed the documentation or wrote the code for the hex > > keyboard. > > > > But it does run the Tektronix board-bucket BASIC via serial port ! > > > > Find more on ftp://ftp.dreesen.ch/TEK_BB > > ah ha! that's what I was looking for. Will check it out in detail. > > I think I am "forum challenged" as all I could see at the original link > > were renderings of the board. > > Thanks Jos. Maybe this will be the ticket... > > Chris > > -- > > Chris Elmquist
Re: WARNING: Clear QIC Tape Bands
Just as a follow-up, I retensioned and read both tapes with clear bands this morning, and they're fine. Since they were parked, there shouldn't have been anything important there, and it looks like the removed oxide is staying on the band. Thanks, Jonathan ‐‐‐ Original Message ‐‐‐ On Wednesday, January 19th, 2022 at 10:46, Chuck Guzis via cctalk wrote: > On 1/18/22 22:32, Alan Perry via cctalk wrote: > > > On 1/18/22 8:22 AM, Chuck Guzis via cctalk wrote: > > > > > You should be warned that Plastibands > > > > > > do deteriorate after a year or so--I have a package of them that cannot > > > > > > be stretched without breaking. > > > > Do you keep them in sealed bags? I keep mine in a zip-lock and the ones > > > > that I got a couple years ago stretch just fine. (I checked after I saw > > > > this.) > > No, I didn't--I did keep them in a dark, cool place, however. Now, I > > keep bands in my freezer. > > --Chuck
Re: WARNING: Clear QIC Tape Bands
On 1/18/22 22:32, Alan Perry via cctalk wrote: > > On 1/18/22 8:22 AM, Chuck Guzis via cctalk wrote: >> You should be warned that Plastibands >> do deteriorate after a year or so--I have a package of them that cannot >> be stretched without breaking. >> > > Do you keep them in sealed bags? I keep mine in a zip-lock and the ones > that I got a couple years ago stretch just fine. (I checked after I saw > this.) No, I didn't--I did keep them in a dark, cool place, however. Now, I keep bands in my freezer. --Chuck
Re: IBM 6731 Diskette Module
On Wed, 19 Jan 2022 at 04:06:59 -0800, D. Resor via cctalk wrote: > > There was also a 5.25" diskette which was nicknamed "IPL" for "initial > program load", and an interface board which was installed into the > typewriter and was referred to as the "IBM Typewriter Modularity Option". > Hi Don, Apologies if you know this already but IPL / initial program load is IBM-speak for "boot". Regards, Peter Coghlan.
Re: seeking Motorola M68MM01A2 documentation
On Wednesday (01/19/2022 at 03:35PM +0100), Jos Dreesen via cctalk wrote: > On 19.01.22 13:15, Jonathan Chapman via cctalk wrote: > > That's a neat board! Where can I/we order one? > > With me... > 20 Eur for the set of 2 + shipping. > > If you are in the US it is probably cheaper to order new ones locally. > > Note that I never completed the documentation or wrote the code for the hex > keyboard. > But it does run the Tektronix board-bucket BASIC via serial port ! > > Find more on ftp://ftp.dreesen.ch/TEK_BB ah ha! that's what I was looking for. Will check it out in detail. I think I am "forum challenged" as all I could see at the original link were renderings of the board. Thanks Jos. Maybe this will be the ticket... Chris -- Chris Elmquist
Re: seeking Motorola M68MM01A2 documentation
On 19.01.22 13:15, Jonathan Chapman via cctalk wrote: That's a neat board! Where can I/we order one? With me... 20 Eur for the set of 2 + shipping. If you are in the US it is probably cheaper to order new ones locally. Note that I never completed the documentation or wrote the code for the hex keyboard. But it does run the Tektronix board-bucket BASIC via serial port ! Find more on ftp://ftp.dreesen.ch/TEK_BB Jos
Re: seeking Motorola M68MM01A2 documentation
That's a neat board! Where can I/we order one? Thanks, Jonathan ‐‐‐ Original Message ‐‐‐ On Wednesday, January 19th, 2022 at 04:08, jos via cctalk wrote: > On 19.01.22 01:22, Chris Elmquist via cctalk wrote: > > > On Tuesday (01/18/2022 at 11:35PM +), Jonathan Chapman wrote: > > > > > How's about a Glitchbus board set that's compatible? I was planning on > > > doing it anyway. > > > > > > That would be very cool. Something along those lines was my plan B and > > > > > > I even dug out a tube of 6802's for the effort. I think I could wire > > > > > > up a prototype over a weekend. MC6802 is a nice "cheat" as you don't > > > > > > have to mess with the two-phase clock stuff. > > > > What would be really slick is an SBC that has everything on it to be > > > > either an Altair 680 or an SWTPC 6800 just by changing some jumpers, > > > > switches, etc. and putting the correct ROM monitor on the board. > > Something around these lines ? > > https://forum.vcfed.org/index.php?threads/tektronix-board-bucket-6800.54128/page-5#post-835416 > > Yes, it runs, I still have some PCB's left. > > Works with both 6800 or 6802, memory map is defined with a GAL. > > Jos
IBM 6731 Diskette Module
Is anyone familiar with the IBM 6731 Diskette Module from around 1984 which gave the IBM Electronic 85 and 95 Selectric Typewriters the ability to store created documents to a 5.25" floppy diskette? There was also a 5.25" diskette which was nicknamed "IPL" for "initial program load", and an interface board which was installed into the typewriter and was referred to as the "IBM Typewriter Modularity Option". I do not have any images of the IBM 6731, but I do have an image capture from the installation and operations manual, posted here: https://www.dropbox.com/s/us8aely530s8p3a/6731diskettemodule.jpg?dl=0 You do not need a Dropbox account to view the image. Simply click on the X of the login pop up and it will disappear. Unfortunately, the only copy of this product manual I ever found was on eBay. I purchased it last month, paid USPS priority mail shipping with tracking and the post office lost it. :/ Thanks Don Resor
Re: AOL diskettes
On Tue, Jan 18, 2022 at 04:47:36PM -0700, Grant Taylor via cctalk wrote: > On 1/18/22 2:21 PM, Peter Coghlan via cctalk wrote: >> https://www.thisiswhyimbroke.com/floppy-disk-table/ > I like it! The ratios are wrong: it's about twice as thick as it ought to be. It's apparently been designed by somebody who has seen a picture of a floppy but never used one. > But I hate the price. Get a LACK table from IKEA (€6.99) and adorn it with 3D prints, or even old floppies? I'd advise against trying to machine patterns into it though as that low-end stuff is basically made of laminated cheese.
Re: seeking Motorola M68MM01A2 documentation
On 19.01.22 01:22, Chris Elmquist via cctalk wrote: On Tuesday (01/18/2022 at 11:35PM +), Jonathan Chapman wrote: How's about a Glitchbus board set that's compatible? I was planning on doing it anyway. That would be very cool. Something along those lines was my plan B and I even dug out a tube of 6802's for the effort. I think I could wire up a prototype over a weekend. MC6802 is a nice "cheat" as you don't have to mess with the two-phase clock stuff. What would be really slick is an SBC that has everything on it to be either an Altair 680 or an SWTPC 6800 just by changing some jumpers, switches, etc. and putting the correct ROM monitor on the board. Something around these lines ? https://forum.vcfed.org/index.php?threads/tektronix-board-bucket-6800.54128/page-5#post-835416 Yes, it runs, I still have some PCB's left. Works with both 6800 or 6802, memory map is defined with a GAL. Jos
