Josh, Amazing job. Very nice. I'm a bit surprised the autorouter couldn't do the board. What a beast to do by hand.
On Wed, Jun 4, 2014 at 11:12 PM, Fabio Battaglia <[email protected]> wrote: > Hi Josh! > I'd like 3 boards myself, when ready for production! > Thanks, > Fabio > On Jun 5, 2014 7:55 AM, "Crusty OMO" <[email protected]> wrote: > >> Thanks Tom, >> >> I'll put you down for 2 boards and 3 LM323K's. I'll try to make trip >> across the boarder to ship them from the US side... let's see how the >> timing works. >> >> Cheers, >> Josh Bensadon >> >> >> ------------------------------ >> Subject: Re: [N8VEM-S100:3966] ALTAIR/IMSAI 8080 CPU replacement board >> From: [email protected] >> Date: Wed, 4 Jun 2014 22:35:06 -0400 >> To: [email protected] >> >> I'll take two when your ready >> >> >> Good work. >> >> ~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~ >> Sent from my Phone >> >> >> On Jun 4, 2014, at 10:19 PM, Crusty OMO <[email protected]> wrote: >> >> 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. >> >> <Pic.bmp> >> >> >> Cheers, >> Josh Bensadon >> >> >> >> >> ------------------------------ >> From: [email protected] >> To: [email protected] >> 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. >> >> <IMG_1527.JPG> >> >> >> Now entering Phase 2... building a PCB. >> >> Cheers, >> Josh Bensadon >> >> >> ------------------------------ >> From: [email protected] >> To: [email protected] >> 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] [mailto:[email protected] >> <[email protected]>] *On Behalf Of *Crusty OMO >> *Sent:* Tuesday, May 13, 2014 1:19 PM >> *To:* [email protected] >> *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]. >> 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]. >> 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]. >> 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]. >> 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]. >> 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]. >> 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]. > For more options, visit https://groups.google.com/d/optout. > -- ------------------------------- Don Caprio [email protected] http://www.uxpro.com (925) 240-UNIX -- 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]. For more options, visit https://groups.google.com/d/optout.
