As a quick follow-up, the RUN/HALT LED does in fact change from red to green
so something is working. I¹ve tried various serial combinations with and
without a NULL adapter but nothing so far.
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.classiccmp.org/cini
http://www.classiccmp.org/altair32
From: Richard Cini <rich.cini-H+***@public.gmane.org>
Reply-To: N8VEM-Post <n8vem-/***@public.gmane.org>
Date: Monday, November 11, 2013 at 4:35 PM
To: N8VEM-Post <n8vem-/***@public.gmane.org>
Subject: Re: [N8VEM: 16477] Stupid N8 Home Computer questions
Thanks Max. I do have the port set for 38.4k, am using 1:1 cable. I¹ll give
the null a try though.
Can you tell me how you have your jumpers set? I did it based on the picture
but I wanted to double check against a known-working setup.
Thanks!
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.classiccmp.org/cini
http://www.classiccmp.org/altair32
From: Max Scane <mjscane-***@public.gmane.org>
Reply-To: N8VEM-Post <n8vem-/***@public.gmane.org>
Date: Monday, November 11, 2013 at 4:04 PM
To: N8VEM-Post <n8vem-/***@public.gmane.org>
Subject: Re: [N8VEM: 16476] Stupid N8 Home Computer questions
Also unlike the SBC, the N8 uses the Z180 ASCI for the serial port. The baud
rate of this port is dependant on the CPU clock frequency. Make sure you are
using the correct speed for the rom image you are using.
Some people have also had trouble with the serial port cabling. I use a
short 1:1 cable from the 10 pin header to a DE9(M) connector then a standard
PC null modem cable (F-F) to the PC.
Hope this helps.
Max
Sent from my iPhone
The only difference between the 2312 and 2511 builds is that the later version
of the board (2312) uses the Z80 CSIO for the SD Card interface. Either build
should be fine for initial testing and booting to a ROM copy of CP/M.
Thanks,
Wayne
Post by Richard CiniMax â¹
Thanks. I¹m using one of the pre-built N8 ROM images from the RomWBW archive.
I¹ve tried both 2312 and 2511 ³CP/M² ROMs and I don¹t get any serial output.
I believe I have the jumpers set properly based on the ³N8-2312 finished²
picture posted on the Wiki (with the exception of the ROM jumpers).
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.classiccmp.org/cini
http://www.classiccmp.org/altair32
Date: Monday, November 11, 2013 at 12:21 AM
Subject: Re: [N8VEM: 16473] Stupid N8 Home Computer questions
Hi Rich,
I don't think there were any differences between the boards from a
programming point of view. The progression was mainly to fix hardware bugs.
You shouldn't need a floppy drive (or chip) installed to boot the rom drive.
Just ensure you have the correct jumpers for your ROM.
Which ROM distribution are you using? The N8 is different from the SBC
(Z180,ASCI, MMU etc) so you will need a specific ROM image.
Cheers!
Max
Post by Richard CiniAll â¹
I just finished building the HC today (I had some free time this long
weekend) and I¹m having some issues with getting it running (basics are OK Â
no solder bridges, voltage OK, etc.). But first, a question on the ROM.
What¹s the difference between the 2312 and 2511 ROM builds? My board has
³HOME COMPUTER VER 1² on it but no other designation that I see. I¹m using a
27C040 ROM which I think should work fine.
Second, does a floppy drive have to be connected for testing or can I boot
to the ROM drive without it (meaning, will system hang without the floppy
connected)?
Thanks!
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.classiccmp.org/cini
http://www.classiccmp.org/altair32
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