Hi Fabio,
I'm working on this project I started 6 months ago, an 8080A replacement board for IMSAI and ALTAIR.
For one reason or another, it kept getting delayed, postponed, forgotten... but recently I was working on a front panel and thought it's a great time to resurrect this project. I did get my ALTAIR up and running in preparation to test this board... the IMSAI is still running, so no worries there.
Anyway, it's not much to see or tell at the moment, but you might enjoy the work in progress.
Picture 1. Back of board, most of the bus is wired, I really like how the separate Data IN/OUT buffers provided two separate connections to run the data bus from.
Picture 2. You can see sockets not yet put on the board, those are mostly for the glue logic... still have a ways to go.
Picture 3. My messy workshop, please don't put anything away or I may never find it.
Cheers,
Josh
Date: Wed, 30 Apr 2014 07:33:03 +0200
Subject: RE: [N8VEM-S100:3384] My first Z-80 board comes to life!
From: hkzl...@gmail.com
To: n8vem...@googlegroups.com
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I'm working on this project I started 6 months ago, an 8080A replacement board for IMSAI and ALTAIR.
For one reason or another, it kept getting delayed, postponed, forgotten... but recently I was working on a front panel and thought it's a great time to resurrect this project. I did get my ALTAIR up and running in preparation to test this board... the IMSAI is still running, so no worries there.
Anyway, it's not much to see or tell at the moment, but you might enjoy the work in progress.
Picture 1. Back of board, most of the bus is wired, I really like how the separate Data IN/OUT buffers provided two separate connections to run the data bus from.
Picture 2. You can see sockets not yet put on the board, those are mostly for the glue logic... still have a ways to go.
Picture 3. My messy workshop, please don't put anything away or I may never find it.
Cheers,
Josh
Date: Wed, 30 Apr 2014 07:33:03 +0200
Subject: RE: [N8VEM-S100:3384] My first Z-80 board comes to life!
From: hkzl...@gmail.com
To: n8vem...@googlegroups.com
Aaaand... You guessed right. China :-/
Next time I'll inspect them better.
Anyway, a little scar, but no victims. This board will run CP/M one (near) day.
What proto are you building with your sea-of-pth?
On Apr 30, 2014 5:36 AM, "Crusty OMO" <crus...@hotmail.com> wrote:
That's some fine work there! I can't believe a machine socket was bad! That's rare, those machine sockets are typically much better quality... lemme guess, made in China... Sorry to hear about the through hole plating. It happens to me too when I'm in a rush. Fortunately, that's not too often.
I'm putting one of my buffered prototyping cards to use... I think I'm up to 400 point to point jumpers and that's 1/3 of it.
Cheers,
Jsoh
Date: Tue, 29 Apr 2014 14:43:44 -0700
From: hkzl...@gmail.com
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:3381] My first Z-80 board comes to life!
Hi everyone!
Today I wanted to take a break from coding and decided to take the soldering iron in hand to relax a bit. The objective: get my N8VEM Z80 cpu card up and running.
I had already soldered most of the passive components a week ago: all that was left to do (or so I thought) was to solder a few headers, plug the components and start with a simple print loop monitor to test the card.
Everything went well until the end, when I noticed one of the 74LS165 had a disconnected pin: turned out the machined socket was bad and one pin was not making contact. I had to desolder the socket, and sadly I damaged not one, but two vias in the process (first ones since years... I guess hurry of completing the board fired back)! The damage wasn't serious enough to interrupt the traces, but to play safe I rewired the connections on the back.
Anyway, now the board correctly starts the monitor, can switch back and forth between low and high pages and can read/write the full 1Mb from the EPROM/RAM card i have installed.
I'll leave work on the board on hold until I get the 6502 V2, because right now I'm having fun with IDE code for that processor and my 6502 v1 cannot live on the bus with another processor card (btw, now I can read and write any sector on my CF cards! I'll publish the code this weekend).
Attaching a few pictures of the card working and of the repair on the back.
Bye!
Fabio
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