Re: [N8VEM-S100:7455] Playing with FP Mini, Crustys 8080, Con I/O & SMB

[litte...@mchsi.com]

Thanks Josh,


That worked fine !  Not that I will toggle in
many programs, but it's nice to have.

Now if I can figure out my System Monitor Board.

When it's installed in my real Imsai, it displays
the address and instruction(s), when installed in my 
'Mini' system, just FF for the instruction.

Todd



----- Original Message -----
From: "Crusty OMO" <crus...@hotmail.com>
To: n8vem...@googlegroups.com
Sent: Monday, July 27, 2015 6:14:08 AM
Subject: RE: [N8VEM-S100:7455] Playing with FP Mini, Crustys 8080, Con I/O & SMB

Hi Todd,

The ROM on the board can be disabled by the jumpers.  Just pull all ROM jumpers out, then you'll have only RAM at 0000.
Or you can also just run the Monitor ROM, then STOP the system once shadow ROM has been mapped out.  Do NOT press RESET or Shadow ROM will come back into play.  To move your PC back to 0000, simply toggle all address switches to 0000 and press EXAMINE.  The EXAMINE and EXAMINE NEXT work by manipulating the 8080's PC register.  EXAMINE uses a JUMP instruction, while NEXT uses the NOP instruction to advance by 1.  There is no "PREVIOUS" because you can't decrement the PC by 1 (through any single instruction).  

So, RUN, STOP, EXAMINE 0000, Deposit program, Examine 0000, examine next, next, (to verify program), Examine 0000 and RUN.  (See no more RESET needed).

Cheers,
Josh


> Date: Sun, 26 Jul 2015 20:27:39 -0400
> From: litte...@mchsi.com
> To: n8vem...@googlegroups.com
> Subject: Re: [N8VEM-S100:7454] Playing with FP Mini, Crustys 8080, Con I/O & SMB
> 
> 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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