MG014 Parallel Port Interface

[Michelle Lawson]

Now that I have a huge chunk of my system working, I figure it's time to start adding printer support to it. Remembering and old topic, and a link to Mr. Gelee's Tech, I ordered his MG014 board, based on the 8255. Since my system is a completely 'roll your own application specific' beast, I would need to integrate a driver into what I'm writing. 

That said, he does have an lprint.c program on his website, but it's in C and I don't know squat about C programming. I guess my best hope is that someone else has something in Z-80 assembly that supports that board. I guess then the question is; does anyone know of anyone that has done that? Thanks for any ideas. 

[Alan Cox]

It should be supported in ROMWBW including using it for all sorts of non printing stuff too

On Sat, 30 May 2026, 11:57 Michelle Lawson, <michelle...@gmail.com> wrote:

Now that I have a huge chunk of my system working, I figure it's time to start adding printer support to it. Remembering and old topic, and a link to Mr. Gelee's Tech, I ordered his MG014 board, based on the 8255. Since my system is a completely 'roll your own application specific' beast, I would need to integrate a driver into what I'm writing. 

That said, he does have an lprint.c program on his website, but it's in C and I don't know squat about C programming. I guess my best hope is that someone else has something in Z-80 assembly that supports that board. I guess then the question is; does anyone know of anyone that has done that? Thanks for any ideas. 

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[Michelle Lawson]

Yep, I figured that might be the case. There is so much stuff in there, a person could spend a lifetime going through it. Heck, I bet Wayne even has a kitchen sink buried in there somewhere. Time to get out the shovel....

[Michelle Lawson]

Woohoo. I found it. https://github.com/wwarthen/RomWBW/blob/master/Source/HBIOS/lpt.asm

Thanks

[Michelle Lawson]

Well, hats off to Mr. Gelee's Tech for a great project. Got my code working last night, thanks to Wayne, and the whole bunch of you all. I need to do a really big test tonight and then integrate it into my WOPRjr Server OS so my client systems can use it to print....

[Michelle Lawson]

Well, I pulled together 7K of text and sent it to the printer without any hiccups. I'm marking this a success. I'm getting ready to integrate it into my WOPRjr Server OS. It is such a good feeling when hardware and software play nice together. The unfortunate thing is that now my RC2014 backplane is as full as I can get it.....
Osc Clock
CPU
RAM/ROM
RTC
Printer
CF Disk
Front Panel Interface
(3) 85C30 Serial cards

[Ed Silky]

Hi Michelle,

I'm glad you sent an update and that everything is working well. Maybe your next project should be a multi-port serial board to consolidate your 3x 85C30 boards into 1.

-Ed

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[Alan Cox]

That's why I built the bus extender card. It puts a load more devices behind a single I/O 8bit port and drives the more loaded lines itself.

My machine has PS2 keyboard, mouse, SCSI, triple headed video, floppies, iee488 etc. Biggest problem becomes power supply!

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