Hi Josh, I'd also like three boards when they're ready and 6 LM323Ks if you have them.
Thanks, Todd * Fabio Battaglia <[email protected]> [140605 02:12]: > 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. -- 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.
