I'll get 2x too, and share my part of the cost. On Apr 30, 2014 7:32 PM, "yoda" <[email protected]> wrote:
> Hi John > > I think talking to the chip will be the easy part - the I/O circuit is > pretty simple. I think the complications will come on the other side with > vram and BT478. > > BTW David I will also share the cost of the prototype boards as well - I > probably should take 2 for the same reasons as John. > > Dave > > On Wednesday, April 30, 2014 11:40:23 AM UTC-5, monahanz wrote: >> >> Hi David, I generally go with two boards. One to build one to check >> traces etc. >> >> No problem here doing the hardware build/checking. I can test the chips >> ports/IO etc. easily but it will be essential to have a simple software >> routine that would put at least one line or character on the screen. Will >> cover my share of prototype boards cost BTW. >> >> John >> >> >> >> >> >> >> >> *From:* [email protected] [mailto:[email protected]] *On >> Behalf Of *David Fry >> *Sent:* Wednesday, April 30, 2014 3:46 AM >> *To:* [email protected] >> *Cc:* [email protected] >> *Subject:* Re: [N8VEM-S100:3386] S-100 boards in work - uPD7220 >> >> >> >> Hi John, >> >> >> >> I'm re-posting in case you missed my earlier post. >> >> >> >> We have 3 volunteers to work on software for 3 different processors for >> the Prototype S100 uPD7220 GDC Board, >> >> I'd just like to clarify if your offer to provide hardware support is >> still open, if so how many PCB's would you need ? >> >> I anticipate this being a longer term project so hopefully shouldn't call >> on you too often :-) >> >> >> >> Todd has offered to co-ordinate the PCB procurement and distribution. >> >> I have uploaded the modified KiCad files to the Wiki, the only changes >> were to replace the 15 pin Dsub connector for a 2 x 8 IDC connector wired >> the same as the console i/o board, and updated the board identifier text >> (bottom right corner) Andrew has checked the schematic change and has given >> it the OK >> >> So if everyone is happy then I guess we are ready to order. >> >> >> >> http://n8vem-sbc.pbworks.com/w/file/79620803/S100%20uPD7220_Proto_01.zip >> >> >> >> regards and thanks >> >> >> >> David Fry >> >> >> On Saturday, April 26, 2014 5:56:07 PM UTC+1, monahanz wrote: >> >> I think we need to do a prototype run on that board first. While it >> contains elements of 3 previous boards we did, it is the first time they >> are all put together in one place. Also as a few of us know, we had real >> problems with that BT478 chip on the VDP board (which itself BTW needs to >> have another prototype run). >> >> >> >> On the 7220 I will help out with the hardware, the thing to remember >> about the 7220 is you have to do quite a bit of software writing to get it >> to be of any use. Is somebody prepared to do that. Because without >> software that chip/board is useless. >> >> >> >> John >> >> >> >> >> >> *From:* [email protected] [mailto:[email protected]] *On >> Behalf Of *David Fry >> *Sent:* Saturday, April 26, 2014 7:40 AM >> *To:* [email protected] >> *Subject:* Re: [N8VEM-S100:3295] S-100 boards in work >> >> >> >> Hi Ed, >> >> >> >> Andrew has uploaded the EDA files for the uPD7220 GDC this afternoon, if >> you feel inclined to do a production run then put me down for 1 board >> >> just for curiosity value. It might be worth considering a smaller run of >> 5 to 10 boards as this board has failed to spark sufficient interest for a >> production run >> >> before. looking a previous forum posts for the uPD7220 GDC it would >> appear to be a descendant of the ECB uPD7220 graphics board interfaced to >> the S100 bus and is ripe for testing. >> >> >> >> https://groups.google.com/forum/#!searchin/n8vem-s100/upd7220/n8vem-s100/ >> KNTuzzAdKbU/XIY-yZTK4dUJ >> >> >> >> Regards >> >> >> >> David Fry >> >> >> On Friday, April 25, 2014 11:19:04 PM UTC+1, Edward Snider wrote: >> >> It does seem like it would be an interesting board for an S100 system. >> >> With almost all of the work done it would be a shame not to go through to >> completion. >> >> >> >> Unfortunately I don't have enough of a system together to help in >> testing, but I can chip in a bit >> >> for prototypes. I'd also be willing to handle the production run if we >> can get takers for at least >> >> 20 boards, if that would be helpful. >> >> >> >> Ed >> >> >> >> >> On Tuesday, September 24, 2013 1:45:38 AM UTC-5, nekonoko wrote: >> >> Hi Andrew, >> >> I can definitely see chipping in at least some of the cost. I find the >> uPD7220 GDC interesting as several business class CP/M systems used it for >> graphics (DEC Rainbow, QX-10 etc.). >> >> Thanks much, >> >> Pete >> >> -- >> 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. 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