Re: BLU on a 2/10: RX but no TX?

Thanks, James. I will have to examine this later. In the meantime, I was able to bootstrap BLU on my Lisa 1, where the serial port appears to be working.

Here is an image of a ProFile with Office System 1.0 installed. The drive reported no bad sectors, and the transfer was problem-free.

https://drive.google.com/file/d/0B0_fWRp3VVS4QXNoVmo1UmE4ZkU/edit?usp=sharing

That said, I haven't checked the contents of this file.

For future people searching this list:

1. The xmodem utility supplied with Minicom (a Telix clone for Linux etc.) shows an error on the last block of a transfer. I haven't checked to see whether the bytes it does manage to download are copied successfully, since I switched instead to using TeraTerm on Windows, which appears to work fine (although you have to remember to select 1K in the xmodem download dialog).
2. With an x-acto knife and patience, it is not very hard to make Twiggy diskettes from 1.2 MB high density 5.25" diskettes.

Thanks very much for BLU. I am extremely happy to have backed up this ProFile at last. Getting started on the Twiggys will be the next step. Regrettably, I don't think my LOS 1.0 system disk 1 master is readable these days, but others may be.

First, though, it will be necessary to redo the keyboard pads. Typing on the PCB with a homemade stylus is a drag. There is also a little bit of corrosion on the I/O board which, while limited in extent, should be nipped in the bud. I am a bit hesitant to work on the board since everything seems to work, but I understand that the corrosion will progress unless it is dealt with.

--Tom

On Saturday, January 4, 2014 2:50:42 PM UTC-5, James MacPhail wrote:
>
>
> There have not been any reports of BLU not transmitting, so I expect
> there is a hardware problem.
>
> You could put your voltmeter between pin 2 of the serial port and
> ground (eg. the chassis) and see if the voltage fluctuates when you
> type in the Terminal Test. You may need to set your meter to mV AC to
> see this, or it may be visible on the 20V DC range. Setting the SCC
> to the slowest speed possible may help make the voltage change
> visible. (eg. 9600 baud in the current version of BLU).
>
> Yes, BLU will back up ProFiles attached to a parallel port card.
>
> The I/O board ROM and drive swap are all that is required to switch
> between 400k and 800k.
>
> The hardware to support LocalTalk is original to every I/O board, so
> no modifications were required.
>
>
> >Is there any good reason why BLU should fail to transmit data from
> >Port B of a 2/10, even while data reception is fine (or so the
> >terminal test screen would indicate)?
>
> >a 400K drive was swapped back in place of the 800k drive,
> >along with the corresponding I/O board ROM. I don't know if that's
> >relevant, but I suppose there's a chance that the backwards
> >reversion to a Lisa was not complete, and modifications to the
> >serial port intended to support e.g. LocalTalk are still in place.
>
> >will BLU back up ProFiles attached to a parallel port card?
>

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