Re: CBM720 heads up

So, finally, the machine works! In fact the ACIA was broken and I had to 
replace it.

In total I had to fix:
- the power supply
- 3 dRAM chips
- CRTC
- CIA
- ACIA
- 556 from the reset circuitry

https://www.flickr.com/photos/afachat/sets/72157647798386959/

Now it's to the cleaning, and maybe replacing the fan with one that works on 
the PC power supply I used to replace the broken original pwr supply.

Thanks to all who helped with info and suggestions!
André

On Saturday 03 January 2015 23:19:59 you wrote:
> Hi,
> 
> on further investigation I found that that the clock signal on the ACIA is
> missing. I.e. the simple XTLO/XTLI-connected crystal-based oscillator does
> not start. No signal on XTLI, also no signal on RxC (which is output of the
> basic clock when the internal clock is used).
> 
> So no wonder I don't get anything. And indeed the comm parameters are
> different from the C64 - esp. the secondary address. You need to set bit 0
> (value 1) for sending, and bit 1 (value 2) for receiving (and may add 128
> to convert between ASCII and PETSCII) - stuff that IIRC isn't available on
> the C64.
> 
> On the BEELINE program, I get a
>      ?BAD SUBSCRIPT IN  3660
> after loading the function keys.
> I'm afraid I can't see what could be the reason. Maybe it only runs on a
> 128k machine? Or on a 6x0 only?
> 
> Anyway, what do you think more likely? A broken 6551 or a broken crystal? Or
> maybe add a small cap across the crystal? I seem to remember that this
> helped at one time (but not sure if on a 6551).
> 
> Thanks
> Andre
> 
> On Saturday 03 January 2015 12:55:22 you wrote:
> > > Thanks. I still need to fiddle with the comm parameters in the BASIC
> > 
> > terminal prog. With Beeline I get a BASIC error during initialization.
> > Something with array indexes. More details later,  have to run.
> > 
> > André
> > 
> > Am 3. Januar 2015 04:47:08 schrieb william degnan <billdegnan@gmail.com>:
> > > I was using BLine tonight to connect with my CBM 256 make simple
> > > internet
> > > connections via a Raspberry Pi. You have to play around with it though.
> > > Not perfect.  I was able to send a test email to myself (not this
> > > message)
> > > 
> > > Here is the D80 file if you want to try it
> > > http://vintagecomputer.net/commodore/D80_BSeries/BEELINE.D80
> > > 
> > > On Fri, Jan 2, 2015 at 10:07 PM, Steve Gray <sjgray@rogers.com> wrote:
> > > > Ok, I found two different ones. The following is the simplest:
> > > > 
> > > > 1 FORa=1TO10:READk$:KEYa,k$:NEXT
> > > > 2 DATA cat1,cat2,cat3,cat4,cat5,cat6,cat7,sysop,steve,gray
> > > > 10 PRINT"{HOME}{HOME}{CLR}{TEXT}{RVS}                       Simple
> > > > Basic
> > > > Terminal Program -SJG                       "CHR$(27)"t{CLR}{RVSOFF}";
> > > > 20 TRAP100:POKE55296,10:POKE55297,96
> > > > 30 OPEN1,2,131,CHR$(6)+CHR$(0)+"++
> > > > 40 GET#1,a$:PRINTa$;:GETb$:PRINT#1,b$;:PRINTb$;:GOTO40
> > > > 100 CLOSE1:PRINT:PRINT"Stopped.":END
> > > > 
> > > > ----
> > > > So it reads definitions for 10 function keys in lines 1. Change line 2
> > > > as
> > > > you wish.
> > > > Line 10 prints a simple header on the first line then sets up a window
> > > > to
> > > > protect it from scrolling off the screen.
> > > > Line 20 traps errors and sets the cursor to blinking via CRTC
> > > > registers
> > > > Line 30 opens the RS-232 channel.
> > > > - 131 tells it to convert ASCII to/from PETSCII
> > > > - CHR$(6) is 300 baud, 8 bit, 1 stop bit.
> > > > - The "++" is needed for B-series but not used (see transactor's CCISA
> > > > page 105 for RS-232 parameters).
> > > > Line 40 accepts keyboard/modem input as prints to the screen.
> > > > Line 100 closes things if there is an error.
> > > > 
> > > > That's it.
> > > > Steve
> > > > 
> > > >  ------------------------------
> > > >  *From:* Steve Gray <sjgray@rogers.com>
> > > > 
> > > > *To:* "cbm-hackers@musoftware.de" <cbm-hackers@musoftware.de>
> > > > *Sent:* Friday, January 2, 2015 1:53 PM
> > > > 
> > > > *Subject:* Re: CBM720 heads up
> > > > 
> > > > I wrote a simple CBM-II terminal program in BASIC. If anyone is
> > > > interested
> > > > I can dig it out and post it.
> > > > 
> > > > Steve
> 
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