Re: Dosbox and Moto software/radios

heath garner

Also check if you are getting rx buffer errors. I was getting them on a real serial port and a USB serial and that went away when I switched to a triplite USB serial adapter. 

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-------- Original message --------
From: John Ward <ldjohn@...>
Date: 4/14/20 5:19 AM (GMT-06:00)
Subject: Re: [Radios] Dosbox and Moto software/radios

configs to change for dosbox:

# for motorola
cycles=fixed 191

# serial1: set type of device connected to com port.
#          Can be disabled, dummy, modem, nullmodem, directserial.
#          Additional parameters must be in the same line in the form of
#          parameter:value. Parameter for all types is irq (optional).
#          for directserial: realport (required), rxdelay (optional).
#                           (realport:COM1 realport:ttyS0).
#          for modem: listenport (optional).
#          for nullmodem: server, rxdelay, txdelay, telnet, usedtr,
#                         transparent, port, inhsocket (all optional).
#          Example: serial1=modem listenport:5000
#          Possible values: dummy, disabled, modem, nullmodem, directserial.
# serial2: see serial1
#          Possible values: dummy, disabled, modem, nullmodem, directserial.
# serial3: see serial1
#          Possible values: dummy, disabled, modem, nullmodem, directserial.
# serial4: see serial1
#          Possible values: dummy, disabled, modem, nullmodem, directserial.

serial1=directserial realport:com2

this runs on a new i7, windows 10 at 4ghz
73 de ZS1EQ

On Tue, Apr 14, 2020 at 4:17 AM Richard Simmer II <dk3ts@...> wrote:
I have also been able to program several older radios using DosBox on a quad core windows 8 machine. The clock cycles needed to be adjusted way down but the biggest thing is using a FTDI USB to serial adaptor cable. I tried several Prolific usb cables and none worked.

On Mon, Apr 13, 2020 at 7:51 PM, Vasilios Pappademetriou
<research@...> wrote:
Alan is correct, let me add some headache on to this.

Lot of windows emulators, VMs (even Virtual Box and VmWare each differ on results), DosBox etc.... will work, sometimes, on some radios, sometimes, not on others.

The other issue is, lot of the newer COM port computers have a 16550 UART, or 16550a UART. This is also what USB to Serial adapters will emulate. But, some of the older computers had a 16540 UART and that is what some of the radios and software expect to find. Some radios and/or their software simply need an old computer, slower clock cycles, pure MS-DOS and a 16540 UART. Other radios are more forgiving.

This comes from someone with 30 years of experience in the IT field and what I have encountered. Your mileage may and will vary as there is no exact science to this.

Be well during these trying times and enjoy Ham radio!


On 4/13/20 5:14 PM, Alan Barrow wrote:
On 4/13/2020 4:36 PM, Cepmender via wrote:
Many older radios need a proper sloooow computer actually running DOS and with a hardware serial bus.

Emulators running in Windows (tm) just don't work.

Here's what's odd, I kept hearing that, yet I'm up to about 7-8 different radios of different generations and CPS's that work find fine with FTDI USB to Serial devices and dosbox:

TK-90 (does not need dosbox)

FTL-3100 and similar
VX-1210 (dosbox not needed with newer CPS's)

Other Maxtracs
CDM's (does not need dosbox, but does need FTDI based serial to ttl adapter)

I think most of the "windows emulators don't work" myths are really just issues with the chip in the USB to serial adapter.

I have some non-FTDI based cables that work fine with windows native CPS's, but not with the old DOS based cps's. So there is a reason the ebay cable sellers list if their cable is FTDI based... it makes a difference.

So while I have old notebooks still with "real" serial ports, I have never had to use them. Yep, sometimes I have to try a few different speed settings on dosbox, but usually something between 500-800 mhz 386 equiv works. And it's just Ctl-F11 and Ctl-F12 to make faster or slower. So very quick to get them to read, usually only takes 20-30 seconds to home in on what works. And I keep all my cps and files on my modern computer.

The radio does not know what's attached to the serial port. There are only three issues which can make a difference, and two of them are due to CPS coding:

- Voltage on various HW pins. Most modern (FTDI and newer) based chips are fine in this regard. I think this is the main thing that bites folks, using unknown USB to serial chips
- Dos Software using timing loops that break on faster computers. Dosbox deals with this nicely
- DOS CPS software only supports COM1 and COM2. Easily dealt with in dosbox... You can map any modern serial port to com1 or com2 (or com3/4 if your cps software supports it)

Have fun,



73 de ZS1EQ

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