OK - I think we can do this as a group - I think beyond the chip select phase it will take all of us to debug and I know John is busy as well - we need to grow beyond John dependency as well.
Dave On Wednesday, April 30, 2014 10:40:51 AM UTC-5, David Fry wrote: > > Hi Dave, > > thanks for the post, this project for me is a learning experience that > combines both my interest in building programming skills in Z80 and my > background in electronics. My background is one of 18 years in the > electronics servicing industry and 10 years in IT admin so the two are kind > of brought together in the S100 computer project, whilst familiar with > microprocessor signalling principles in general I currently don't have > access to a logic analyser to look at signal timing etc... My oscilloscope > helps but not always... > > Having John's extensive experience to fall back on would be key to iron > out any problems should they arise, but I understand his time is already > committed so this would be last resort. > > yes, there is always a risk of problems with any new board, but this > particular board is a port to the s100 bus of an established ECB design > therefore it's a risk I'm happy to take. > > Best regards > > 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.
