Don - would these work? If we didn't care so much about the color? http://www.electronicsurplus.com/Item/2111/JBT%20-%20Switch_%20rocker_%20SPDT-5A_%20Package%20of%202_%20-%203-532/
Andrew B On Friday, June 6, 2014 9:53:14 PM UTC-7, Don Caprio wrote: > > Josh, Rich, and S-100 gang, > > The Imsai front panel S-100 (aka fp-mini) was stalled for quite some time. > Family, work and > remodel project left no spare time. > > Looks like we have new life on the project. Many, many thanks to Josh who > got one of prototype > boards and worked out the final bugs. Looks like The next prototype should > be our last before > production run. > > This board is a bit pricey due to the cost of the mini paddle switches. A > completed set of paddle > switches goes for ~ $125.00. My source for the toggles left the company so > I'm finding a new > contact and pricing. > > The FP-Mini and Josh's new 8080 board is going to make a fantastic, two > board complete system. > > I'm working with a local sheet metal fabricator on a mini-chassis based > around the fp-mini and the > S-100 8 slot mother board. I needed a chassis design for the next board > layout. We'll need to move > switches around and provide mounting holes on the PCB. Anyone who has > ideas or experience > creating a photo mask for the Plexiglas section drop me a line. It may be > as simple as printing a > transparency on a laser printer. > > Once I get a final price on the chassis I'll send out a notice to see who's > interested. The more we order the cheaper they are. I've mocked up a > prototype of the chassis > for your review and comments. > > Thanks. > > > > > > > On 06/ 6/14 07:55 AM, Crusty OMO wrote: > > Thanks John, > > Andrew, > > That would be great if you could do a fill on the area around the > regulator, or perhaps walk me through it? The other error about pads being > next to each other doesn't matter, I just over rule the computer's > objection. > > Cheers, > Josh > > > ------------------------------ > From: [email protected] <javascript:> > To: [email protected] <javascript:> > Subject: RE: [N8VEM-S100:3991] ALTAIR/IMSAI 8080 CPU replacement board > Date: Thu, 5 Jun 2014 21:26:15 -0700 > > Josh, Andrew may be able to brush it up. He is a marvel at that these > things > > John > > > > > > *From:* [email protected] <javascript:> [ > mailto:[email protected] <javascript:>] *On Behalf Of *Crusty OMO > *Sent:* Thursday, June 5, 2014 8:29 PM > *To:* [email protected] <javascript:> > *Subject:* RE: [N8VEM-S100:3990] ALTAIR/IMSAI 8080 CPU replacement board > > > > Hi John, > > I uploaded the board, schematic(s), gerber files and firmware file to the > Wiki site. > Look in > Board Information, S-100 boards, S-100 ALTAIR-IMSAI 8080 CPU Board > > The DRC produces 2 errors which I don't know how to suppress. > 1 error is a drill pad next to a mounting pad for the SD card, I > oversized the pads and they overlap. Neither pad is an active pin or > conductor, the drill is just a pilot hole to position the SD card socket, > the pad is just to solder the body of the socket. > The other error(s) are from a bunch of traces I dumped around the voltage > regulator to act as some extra heat sink. I should really do a "fill" in > that area, but I don't know how and it's just easier for me to zig zag some > wide traces to do the job. I ignore the errors, the gerber files look good. > > The firmware file is just a modification of my 8080 monitor program. It's > been modified to use the 8250 UART's, and it also has the start of the > SPI/SD card interface. I only got as far as receiving the 0x01 status byte > from the SD card, which means it initialized successfully and I am able to > talk to it. In the weeks to come, I'll return to working on the firmware > to get it to boot CP/M from the SD card. But first, I must make some > progress with my ELF projects. > > Cheers, > Josh Bensadon > > > > ------------------------------ > > From: [email protected] <javascript:> > To: [email protected] <javascript:> > Subject: RE: [N8VEM-S100:3982] ALTAIR/IMSAI 8080 CPU replacement board > Date: Thu, 5 Jun 2014 09:20:20 -0700 > > Josh, great work – you must have a lot of time on your hands! > > Could you put me down for 2 boards. > > Also could you point me to the most current schematic/board diagram > > Thanks > > John > > > > > > *From:* [email protected] <javascript:> [ > mailto:[email protected] <javascript:>] *On Behalf Of *Crusty OMO > *Sent:* Wednesday, June 4, 2014 7:20 PM > *To:* [email protected] <javascript:> > *Subject:* RE: [N8VEM-S100:3964] ALTAIR/IMSAI 8080 CPU replacement board > > > > Hi Guys, > > Well I'm finally done laying out this board. The autorouter only produced > swiss cheese with over 900 via's. It looked terrible! > Anyway, I scrapped everything the autorouter did initially, and proceeded > to layout the traces manually. Once I got what I thought was all the hard > parts done, I let the autorouter have another go at it. Again it did not > work out so well and it was unable to complete the board, so I proceeded to > undo it's changes and/or improve it's routing manually. I squeezed those > traces in there tight, any tighter and they'll be popping off the board. > Anyway, I'm working on the silkscreen layer and ready to do a run. > Here's a picture of the board layout.... > You can see the serial port connections on the top left, SD card to the > right of the 27C256 EPROM, parallel ports next to that and the ALTAIR and > IMSAI front panel connectors. There are also a few jumpers around the > board to configure for CPU or Peripheral board only and ALTAIR/IMSAI mode. > Firmware for the board will be my next project, but I have to make > preparations for VCF-MW my priority. Dave Ruske and I will be doing a > COSMAC 1802 exhibit there in September. > > > > > > Cheers, > Josh Bensadon > > > > > ------------------------------ > > From: [email protected] <javascript:> > To: [email protected] <javascript:> > Subject: RE: [N8VEM-S100:3711] ALTAIR/IMSAI 8080 CPU replacement board > Date: Sun, 18 May 2014 00:57:20 +0000 > > Hi Guys, > > Well, this project has just reached a milestone. The hardware is tested > and working. I had some rewiring to do to make it work for the ALTAIR, I > thought the ALTAIR and IMSAI front panels were (near) identical, but they > are not. > There are some jumpers on the board to configure between ALTAIR and IMSAI. > > Here's a picture of my debugging and testing setup. The board is being > tested in the ALTAIR. > > > > > > > Now entering Phase 2... building a PCB. > > Cheers, > Josh Bensadon > ------------------------------ > > From: [email protected] <javascript:> > To: [email protected] <javascript:> > Subject: RE: [N8VEM-S100:3666] ALTAIR/IMSAI 8080 CPU replacement board > Date: Tue, 13 May 2014 13:56:05 -0700 > > Very nice Josh! > > John > > > > *From:* [email protected] <javascript:> [ > mailto:[email protected] <javascript:>] *On Behalf Of *Crusty OMO > *Sent:* Tuesday, May 13, 2014 1:19 PM > *To:* [email protected] <javascript:> > *Subject:* RE: [N8VEM-S100:3664] ALTAIR/IMSAI 8080 CPU replacement board > > > > Hi Group, > > Well, I'm cooking up this board at the moment. I have all the hardware > figured out to run like the original CPU boards. > I need to do a little more testing of the hardware, then I'll proceed to > building the boards. > The Memory, I/O, UARTs and SPI interface to the SD card appear to all be > working. > 8K chunks of memory can become either ROM, RAM or mapped off the board. > > CPU: 8080A > UARTS: 2x 8250 > RAM: 2x 32K > ROM: 32K > I/O: 8 input, 6 output pins > SPI to SD Card interface > ALTAIR & IMSAI Front Panel Connectors. > > Where ROM is selected in a block it overlaps the RAM on reads, but writes > go through to RAM. > The ROM can then be disabled and reads will come from the RAM at that > location. > The firmware is copying itself to RAM then switching off the ROM. > The CPU can be deselected with jumpers and the board will work as RAM/ROM > and I/O for another CPU on the bus. > > Pictures attached. Yellow-Data, Brown-Address, Blue-I/O, > Green-Control/Status & everything else. > > Regards, > Josh Bensadon > > > > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > > -- > Don [email protected] <javascript:> > > -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. 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