[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [N8VEM-S100:5534] SCC and Z80/8086 monitor

Roger ?

	I don¹t think so. I¹m using 3-wire as well with RTS/CTS jumpered per the
build instructions.

	I have attached three files for the loopback program I¹m using (hopefully
they get posted). It¹s a bit of a hack-job, clipping pieces of code from
different places plus what¹s on S100-Computers. I¹m actually surprised it
worked the first time.

	The SCC is running at 19200 baud and my console at 9600. The setup is the
S100 Z80 board, a CompuPro 64k board (with certain memory ranges
disabled), a Solid State Music IO4 (UAR/T based console board I use for
everything) and the S100-SCC. The board passes the loopback so I know it¹s
not the board ? it has to be a configuration setting in the ROM preventing
input from being processed by the code.


Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator

On 11/8/14, 12:36 AM, "norwestrzh via N8VEM-S100"
<n8vem...@googlegroups.com> wrote:

>Hi Rich --
>>> .... configuration also exhibits ³input anomalies². In this case, I
>see only output ? no input. I can definitely ³see² characters coming
>>> through the interface (using my protocol analyzer), but nothing on
>the screen.
>I'm having the same problem.  I can spew output from the serial card to
>an RS232 device, but cannot get any input back from the RS232 device.
>My board also "passes" the loopback test.  I was assuming that there is
>something about the RS232 "control" signals on the interface that I'm
>not doing correctly, but so far I've not found out what that is.  I'm
>just trying to use a "simple" 3-wire connection (that works for so many
>other UARTS -- Z80 DART, Z80 SIO, 8251, etc. etc.).  Is there something
>strange about the SCC?
>You received this message because you are subscribed to the Google Groups
>"N8VEM-S100" group.
>To unsubscribe from this group and stop receiving emails from it, send an
>email to n8vem-s100+...@googlegroups.com.
>For more options, visit https://groups.google.com/d/optout.

Attachment: sccloop.ASM
Description: Binary data

Attachment: sccloop.hex
Description: Binary data

Attachment: sccloop.lst
Description: Binary data