|Re: [hatari-devel] Problem with printer output?|
[ Thread Index |
| More lists.tuxfamily.org/hatari-devel Archives
On perjantai 03 helmikuu 2012, Matthias Arndt wrote:
> > This works fine for TOS v1.00, v3.06, v4.04
> > and EmuTOS.
> > However, Hatari creates no printer output file
> > when same test program is run within TOS versions
> > v1.02 - v2.06.
> I can't remember on which TOSes I tested the output back then.
> For the moment I cannot confirm v2.06. It works here for TOS v2.06 with
> my standard Satandisk config.
> I only clicked on "Print" on the desktop for NEWDESK.INF
Ah, that's a good test.
If I use TOS "Print screen" option after running MINIMAL.PRG,
then I get "printer-out" file, which grows very slowly, 4KB
at the time.
When looking at the code, printer.c has a minor issue
compared to midi.c:
* It buffers the output for 2kB which is flushed at every VBL
and when Hatari is exited normally.
* However, it doesn't tell C-library to disable buffering, so
writes will be buffered also in the C-library, for whatever
amount is the optimal size for the filesystem. In my case
that's apparently 4kB.
-> The code should either let C-library do the buffering
(i.e. data will be flushed automatically at fclose(),
or disable C-library buffering.
And the init code is peculiar:
if (strlen(ConfigureParams.Printer.szPrintToFileName) <= 1)
const char *psHomeDir;
psHomeDir = Paths_GetHatariHome();
/* construct filename for printing.... */
if (strlen(psHomeDir)+1+strlen(PRINTER_FILENAME) <
I.e. user can use a filename with one letter or one that's longer
than home+hatari.prn. E.g. /tmp/print.out isn't tolerated.
However, these don't explain why the file isn't even opened with
TOS versions v1.02 - v2.06.
On assumption that they do some internal buffering, I replaced
the TEXT file with Hatari's "video.c" (144kB), but that didn't
help anything. There's still no printer-out file with TOS v2.
Then I tried Gdb.
In TOS v2, running MINIMAL.PRG didn't result in any
Printer_TransferByteTo() calls, but "Print screen" did.
On the listed working TOS versions, MINIMAL.PRG running results
in Printer_TransferByteTo() calls though.
When I printed in psg.c, the PORTA value, during the printing...
In TOS v3 & v4, I get:
In TOS v1.00, I get:
However, in TOS v1.04 - v2.06 I get this with MINIMAL.PRG:
I.e. the bits 0x4 and 0x2 are being toggled, although the code checks
for bit 0x20 being toggled:
/* Bit 5 - Centronics strobe? If STROBE is low and
the LastStrobe was high,
then print/transfer to the emulated
if (LastStrobe && (
(PSGRegisters[PSG_REG_IO_PORTA]&(1<<5)) == 0 ))
/* Seems like we want to print something...
 TOS Print screen gives same PORTA output as I get for Fwrites
to PRN: in the working TOS versions.
Any idea what's wrong?