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] <javascript:> [mailto:[email protected] <javascript:> ] On Behalf Of David Fry Sent: Saturday, April 26, 2014 7:40 AM To: [email protected] <javascript:> 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] <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]. 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.
