Hi Andrew,
Thanks for looking at the schematic changes,just wanted to make sure I hadn't introduced any errors. The design rule checker doesnt report any errors so should be ok to go to prototype. (Changed 15pin Dsub connector for 2 x 8 IDC as per Console I/O + Lava10 boards)
So, is anyone else out there interested in being involved in a prototype run of the S100 uPD7220 GDC board ?
As John has already pointed out this will involve many hours of coding to make the board functional, so this may be one for those who like a challenge :-)
If no none steps forward in the Z80 camp then I will happily take on the Z80 coding but results will be slow as I am relearning my Z80 asm after 30 years away, but maybe others out there might be interested in writing code for other processors ???
Just trying to guage the level of interest at the moment and work out a way forward.
I have attached a zip of the KiCad files (modified for 2 x 8 IDC monitor connector)
I'm using KiCad build (2013-07-07 BZR 4022)-stable
your comments and feedback please
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
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.
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.
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
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