Re: [N8VEM-S100:7448] Playing with FP Mini, Crustys 8080, Con I/O & SMB

[litte...@mchsi.com]

I was determined to work on this today, so I patched
in a power supply and got it working for now. 

It powers up and boots on Crusty's PCB with a; 

STOP, REST, RUN on the Fp Mini. 



I ran several memory tests from boot Eprom and the Monitor 
in CPM.  It looks like all the LED's on the FP Mini are working 
as they should.

I have yet to find out how I can 'jump' out of Crusty's software, 
so I can try some deposits / examines or even toggle in a simple
program...


Todd





----- Original Message -----
From: litte...@mchsi.com
To: n8vem...@googlegroups.com
Sent: Sunday, July 26, 2015 12:35:01 PM
Subject: Re: [N8VEM-S100:7448] Playing with FP Mini, Crustys 8080, Con I/O & SMB

Josh,

The 8080 board has been working fine for months, it wasn't until
I installed the FP Mini and started playing around when it went out.

I doubt the FP had anything to do with it, the power supply was a 
used purchase from Ebay, probably took a crap.

Todd




----- Original Message -----
From: "Crusty OMO" <crus...@hotmail.com>
To: n8vem...@googlegroups.com
Sent: Sunday, July 26, 2015 12:00:36 PM
Subject: RE: [N8VEM-S100:7447] Playing with FP Mini, Crustys 8080, Con I/O & SMB

Todd,

The 8080 board uses the +/- 16V for only two circuits...
1. The 8080 and 8224 clock chip itself (draws only a few milliamps, I'll guess 50ma max)
2. The RS232 transmitter chips 1488's, and I'll guess these use about 10ma max.

Check the 78Lxx and 79Lxx regulators for any shorts, or check capacitors for correct polarity?

Regards,
Josh


Date: Sun, 26 Jul 2015 09:15:02 -0700
From: litte...@gmail.com
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:7447] Playing with FP Mini, Crustys 8080, Con I/O & SMB

I finally found some time to play with my setup now that
I finished the FP Mini board.  Why trying to integrate
all the boards to work together, I lost my +16vdc....

Out of all the boards, only Crustys 8080 uses +/- 16vdc
The switcher I have outputs +15vdc @ 1.5 amps & -15vdc @ 1.5 amps.
Was this not enough ?  What is the required draw for the 8080 pcb ?

Now I can't play today until I get another supply :-(

I'd like some setup tips from other users with same setup. 














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