Previous Thread
Next Thread
Print Thread
#123500 07/06/24 06:55 PM
Joined: Feb 2014
Posts: 1,033
Likes: 119
G
Very Senior Member
OP Online Content
Very Senior Member
G
Joined: Feb 2014
Posts: 1,033
Likes: 119
Hi all,

I was working on the imagewriter II but got stuck trying to figure out the gate array.

I happened to notice a skeleton by AJR for the NLQ401 and thought I'd give it a stab.

I was able to get the cr steppers working, then the lf steppers, and got the buttons working but it just wouldn't go into the self test. After doing some machinations with the debugger, the self test is doing something.


I've got the print head a little backwards but finally, it's doing something recognizable!


[Linked Image from i.imgur.com]


ok, got the printhead pins in the right order.

[Linked Image from i.imgur.com]

was able to coax a few characters to be printed but there's a flipflop on the schematic that I haven't implemented yet.

[Linked Image from i.imgur.com]

Last edited by Golden Child; 07/07/24 12:26 AM.
2 members like this: Duke, robcfg
Joined: Feb 2014
Posts: 1,033
Likes: 119
G
Very Senior Member
OP Online Content
Very Senior Member
G
Joined: Feb 2014
Posts: 1,033
Likes: 119
If you're interested, the code isn't very large. The hardware has a simplicity to it and the schematic gives you lots of information.


https://github.com/goldnchild/mame/tree/nlq401

2 members like this: exidyboy, robcfg
Joined: Feb 2008
Posts: 158
Likes: 6
G
Senior Member
Offline
Senior Member
G
Joined: Feb 2008
Posts: 158
Likes: 6
Nice work.
Could you have a look at the MPS-1230? This code has sat there rotting for 9 years.
(https://github.com/mamedev/mame/blob/master/src/mame/commodore/mps1230.cpp)
This is a combo NLQ parallel / Commodore IEC printer so it can be used on many different computers.
I own a working MPS-1230 if any more info is needed. There's a Guru-Reame in the src.


Dumping ROMs for MAME since 1999!
https://gurudumps.otenko.com

Link Copied to Clipboard
Who's Online Now
0 members (), 47 guests, and 0 robots.
Key: Admin, Global Mod, Mod
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Forum Statistics
Forums9
Topics9,292
Posts121,515
Members5,067
Most Online1,283
Dec 21st, 2022
Our Sponsor
These forums are sponsored by Superior Solitaire, an ad-free card game collection for macOS and iOS. Download it today!

Superior Solitaire
Forum hosted by www.retrogamesformac.com