17 Jun
2009
17 Jun
'09
9:37 p.m.
--- On Wed, 6/10/09, Andrew Lynch wrote:
From: Andrew Lynch
Subject: NEC uPD7220/GDC Design Manual
To: cctalk at classiccmp.org
Date: Wednesday, June 10, 2009, 8:45 PM
Hi! Does anyone have the NEC uPD7220/GDC Design Manual?
I am looking for one as part of research on building a home
brew NEC 7220 video board.
Thanks and have a nice day!
Andrew Lynch
I waited with a response, assuming that somebody has the manual
you are looking for. I am not 100% sure, but I might have that
manual. I am sure that I do have _a_ NEC 7220 GDC manual, and
I remember (15+ years ago) that I used that manual to write a
BASIC program to calculate register values based on the timing
parameters for the VDU. I don't remember if the manual contained
hardware info, it might. Next time I am in the old house, I will
search for the manual in the attic. Perhaps this weekend ...
- Henk.
-----REPLY-----
Hi Henk! Thanks! Any help you can provide is greatly appreciated. I am
interested and researching the possibility of a NEC uPD7220 home brew video
board. The SY6545 video board I made for the N8VEM project is working out
really well but it is just a simple character only display.
Ideally, you could scan the book if that is possible but if not would you be
interested in selling it? I contacted NEC and they didn't know anything
about it. Apparently very few people still have the manual and bitsavers
doesn't have it either. I did some library searches but no luck although it
is cited as a reference in a couple of college papers like masters thesis,
etc.
What I really need to know is if I can implement a simple circuit using few
enough 74LS TTL ICs to fit on a Eurocard ECB board. That means it can't be
more than about 30 maximum. Using high capacity SRAMs should help but I
think it requires some funky latching mechanisms to share the video address
and data lines.
I looked at the NEC APC video board and it is just huge. I hope that is not
an indication of the complexity needed!
Thanks and have a nice day!
Andrew Lynch
17 Jun
17 Jun
9:45 p.m.
On Wed, 17 Jun 2009, Andrew Lynch wrote:
Date: Wed, 17 Jun 2009 21:37:04 -0400
From: Andrew Lynch <lynchaj at yahoo.com>
Reply-To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
To: cctalk at classiccmp.org
Subject: RE:NEC uPD7220/GDC Design Manual
--- On Wed, 6/10/09, Andrew Lynch wrote:
interested in selling it? I contacted NEC and they didn't know anything
about it. Apparently very few people still have the manual and bitsavers
doesn't have it either. I did some library searches but no luck although it
is cited as a reference in a couple of college papers like masters thesis,
etc.
What I really need to know is if I can implement a simple circuit using few
enough 74LS TTL ICs to fit on a Eurocard ECB board. That means it can't be
more than about 30 maximum. Using high capacity SRAMs should help but I
think it requires some funky latching mechanisms to share the video address
and data lines.
I looked at the NEC APC video board and it is just huge. I hope that is not
an indication of the complexity needed!
Thanks and have a nice day!
Andrew Lynch
Probably 30 would do, I have in front of me a S100 card with a 7220. 128KB of
64 Kb DRAM and 31 TTL ICs...
Peter Wallace
Mesa Electronics
(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.
11:30 p.m.
Andrew Lynch wrote:
What I really need to know is if I can implement a
simple circuit using few
enough 74LS TTL ICs to fit on a Eurocard ECB board. That means it can't be
more than about 30 maximum. Using high capacity SRAMs should help but I
think it requires some funky latching mechanisms to share the video address
and data lines.
Andrew,
Did you get the one copy at this link ?
http://electrickery.xs4all.nl/comp/virtlibrary.html
It doesn't have schematics per say, but there's plenty of info in that pdf.
=Dan
[ = http://www2.applegate.org/~ragooman/ ]
18 Jun
18 Jun
3:34 p.m.
Andrew Lynch wrote:
I thought hte Epson QX10 used a 7220, and I've just checked the technical
manual and it does.. The video circuitry is on a daughterboard, the
newer one used an ASIC so the schemaitcs aren't a lot of use to you, but
the older one was the 7220 + DRAM + TTL + a chracter generator EPROM. It
doens't look _that_ complicated...
I think the QX10 technical manual is on a web site somewhere, and
includes said schematics.
May be of interest...
-tony
What I really need to know is if I can implement
a simple circuit using few
enough 74LS TTL ICs to fit on a Eurocard ECB board. That means it can't be
more than about 30 maximum. Using high capacity SRAMs should help but I
think it requires some funky latching mechanisms to share the video address
and data lines.
Andrew,
Did you get the one copy at this link ?
http://electrickery.xs4all.nl/comp/virtlibrary.html
It doesn't have schematics per say, but there's plenty of info in that pdf.
6:30 p.m.
Tony Duell wrote:
yes the tech manuals are on that website.
I just downloaded them too
How many pages is in the 7220 databook ?
That link for the databook has 24 pages and a friend of mine here in
Pittsburgh has a papercopy which has only 24pages.
=Dan
[ = http://www2.applegate.org/~ragooman/ ]
Andrew,
Did you get the one copy at this link ?
http://electrickery.xs4all.nl/comp/virtlibrary.html
It doesn't have schematics per say, but there's plenty of info in that pdf.
I thought hte Epson QX10 used a 7220, and I've just checked the technical
manual and it does.. The video circuitry is on a daughterboard, the
newer one used an ASIC so the schemaitcs aren't a lot of use to you, but
the older one was the 7220 + DRAM + TTL + a chracter generator EPROM. It
doens't look _that_ complicated...
I think the QX10 technical manual is on a web site somewhere, and
includes said schematics.
May be of interest...
23 Jun
23 Jun
4:14 p.m.
From: lynchaj at yahoo.com
To: cctalk at classiccmp.org
Subject: RE:NEC uPD7220/GDC Design Manual
Date: Wed, 17 Jun 2009 21:37:04 -0400
--- On Wed, 6/10/09, Andrew Lynch wrote:
I have bought in the eigthies a eurocard sized board with memory and
the 7220 GDC (for a lot of money). So, it must be possible to build a
graphics module on 160x100 mm with the 7220, especially now that large
capacity RAM chips are available. I also found a schematic with the 7220
but I cannot say if that is the schematic of the module ...
The schematic is just 2 pages, so I can scan that and email it to you.
I have found the manual I remembered. It is called "?PD 7220 GDC GRAPHICS
DISPLAY CONTROLLER", and has 112 pages. It contains software sections and
hardware descriptions. In the back is a minimum GDC system design schematic.
I don't work at Oc? any longer, so I don't have the nice fast hi-res
scanning machines available to me anymore. I guess that it is possible to
scan the 112 pages, but I don't need the manual anymore. For snail mail
cost (from The Netherlands), I can send it to you. Contact me privately.
It would be nice if you could scan it and pass that on to Al for archiving
on bitsavers.
greetz,
- Henk.
From: Andrew Lynch
Subject: NEC uPD7220/GDC Design Manual
To: cctalk at classiccmp.org
Date: Wednesday, June 10, 2009, 8:45 PM
Hi! Does anyone have the NEC uPD7220/GDC Design Manual?
I am looking for one as part of research on building a home
brew NEC 7220 video board.
Thanks and have a nice day!
Andrew Lynch
I waited with a response, assuming that somebody has the manual
you are looking for. I am not 100% sure, but I might have that
manual. I am sure that I do have _a_ NEC 7220 GDC manual, and
I remember (15+ years ago) that I used that manual to write a
BASIC program to calculate register values based on the timing
parameters for the VDU. I don't remember if the manual contained
hardware info, it might. Next time I am in the old house, I will
search for the manual in the attic. Perhaps this weekend ...
- Henk.
-----REPLY-----
Hi Henk! Thanks! Any help you can provide is greatly appreciated. I am
interested and researching the possibility of a NEC uPD7220 home brew video
board. The SY6545 video board I made for the N8VEM project is working out
really well but it is just a simple character only display.
Ideally, you could scan the book if that is possible but if not would you be
interested in selling it? I contacted NEC and they didn't know anything
about it. Apparently very few people still have the manual and bitsavers
doesn't have it either. I did some library searches but no luck although it
is cited as a reference in a couple of college papers like masters thesis,
etc.
What I really need to know is if I can implement a simple circuit using few
enough 74LS TTL ICs to fit on a Eurocard ECB board. That means it can't be
more than about 30 maximum. Using high capacity SRAMs should help but I
think it requires some funky latching mechanisms to share the video address
and data lines.
I looked at the NEC APC video board and it is just huge. I hope that is not
an indication of the complexity needed!
Thanks and have a nice day!
Andrew Lynch 
24 Jun
24 Jun
10:31 a.m.
I have bought in the eigthies a eurocard sized board
with memory and
the 7220 GDC (for a lot of money). So, it must be possible to build a
graphics module on 160x100 mm with the 7220, especially now that large
capacity RAM chips are available. I also found a schematic with the 7220
but I cannot say if that is the schematic of the module ...
The schematic is just 2 pages, so I can scan that and email it to you.
I have found the manual I remembered. It is called "?PD 7220 GDC GRAPHICS
DISPLAY CONTROLLER", and has 112 pages. It contains software sections and
hardware descriptions. In the back is a minimum GDC system design schematic.
I don't work at Oc? any longer, so I don't have the nice fast hi-res
scanning machines available to me anymore. I guess that it is possible to
scan the 112 pages, but I don't need the manual anymore. For snail mail
cost (from The Netherlands), I can send it to you. Contact me privately.
It would be nice if you could scan it and pass that on to Al for archiving
on bitsavers.
greetz,
- Henk.
I can scan the manual and send it to Al. It would probably be faster and
cheaper to send it to me in Sweden... unless you really wants the dead
tree version of the manual.
I have added a picture of the main board of the Nokia VDU301 VT 220
terminal to my website. The gold plated angled pin header on the top
right side is just connected to a board with two DB25 serial ports, a
mouse port and the keyboard connector.
The blue and red connectors to the left is the connectors for the analog
video section and the power supply.
http://www.home.neab.net/guest/Nokia-VDU301-mainboard.jpg
I've got a ton of these boards and literally a ton of complete
terminals, anyone in need of a Nokia terminal?
/G?ran
6:16 p.m.
New subject: Göran NEC uPD7220/GDC Design Manual
G?ran,
I'd be interested in a digital copy of the manual.
Are you interested in selling one of these boards with the uPD7220? If so
can you give me a feel for cost + shipping to the USA.
Thanks
Robo5.8
I can scan the manual and send it to Al. It would probably be faster and
cheaper to send it to me in Sweden... unless you really wants the dead
tree version of the manual.
I have added a picture of the main board of the Nokia VDU301 VT 220
terminal to my website. The gold plated angled pin header on the top
right side is just connected to a board with two DB25 serial ports, a
mouse port and the keyboard connector.
The blue and red connectors to the left is the connectors for the analog
video section and the power supply.
http://www.home.neab.net/guest/Nokia-VDU301-mainboard.jpg
I've got a ton of these boards and literally a ton of complete
terminals, anyone in need of a Nokia terminal?
/G?ran
25 Jun
25 Jun
3:41 p.m.
Date: Wed, 24 Jun 2009 16:31:39 +0200
From: axelsson at acc.umu.se
To: General at acc.umu.se
Subject: Re: NEC uPD7220/GDC Design Manual
Hi G?ran,
mail is coming in very slow from CCtalk at the moment ...
compared to the lots of mails last two weeks!
I already wrote to Dan that I will send the manual to him.
He will scan the manual and will send the PDF to Al for bitsavers.
thanks,
- Henk.
I have bought in the eigthies a eurocard sized
board with memory and
the 7220 GDC (for a lot of money). So, it must be possible to build a
graphics module on 160x100 mm with the 7220, especially now that large
capacity RAM chips are available. I also found a schematic with the 7220
but I cannot say if that is the schematic of the module ...
The schematic is just 2 pages, so I can scan that and email it to you.
I have found the manual I remembered. It is called "?PD 7220 GDC GRAPHICS
DISPLAY CONTROLLER", and has 112 pages. It contains software sections and
hardware descriptions. In the back is a minimum GDC system design schematic.
I don't work at Oc? any longer, so I don't have the nice fast hi-res
scanning machines available to me anymore. I guess that it is possible to
scan the 112 pages, but I don't need the manual anymore. For snail mail
cost (from The Netherlands), I can send it to you. Contact me privately.
It would be nice if you could scan it and pass that on to Al for archiving
on bitsavers.
greetz,
- Henk.
I can scan the manual and send it to Al. It would probably be faster and
cheaper to send it to me in Sweden... unless you really wants the dead
tree version of the manual.
I have added a picture of the main board of the Nokia VDU301 VT 220
terminal to my website. The gold plated angled pin header on the top
right side is just connected to a board with two DB25 serial ports, a
mouse port and the keyboard connector.
The blue and red connectors to the left is the connectors for the analog
video section and the power supply.
http://www.home.neab.net/guest/Nokia-VDU301-mainboard.jpg
I've got a ton of these boards and literally a ton of complete
terminals, anyone in need of a Nokia terminal?
/G?ran
5456
days inactive
5463
days old
8 comments
7 participants
participants (7)
-
ard＠p850ug1.demon.co.uk -
axelsson＠acc.umu.se -
henk.gooijen＠hotmail.com -
lynchaj＠yahoo.com -
pcw＠mesanet.com -
ragooman＠comcast.net -
robo58＠optonline.net