NE555

I ordered the Hyper-XF ROM and installed it, and using my original DOS-XE disk I attempted to format The XF551 is still giving me an error message when I try to format as a double density disk, formatting as an AT1050 is always successful. I get this error on both my XF551 drives, so I think it must be user error. No matter what I do, I cannot seem to get DOS-XE to register the drive as XF551 in SETUP.COM. Any suggestions?

Thanks for all the replies. I think I will replace the ROM with Hyper-XF. How easy is it to replace the ROM? Is it simply a matter or replacing the original socketed ROM with the Hyper-XF ROM?

I have two XF551 Atari drives. They won't format any disk when I use DOS-XE (Error #173) regardless of formatting density, but the drives will always successfully format disks with DOS 2.5. Does it sound like I have a corrupt DOS-XE? I'm not sure if this is important to troubleshooting, but DOS-XE always identifies my XF551 drives as AT810 drives. Thanks.

The startup screen on this upgraded 800XL with DOS 2.5 says, "Setting up ATARI 130XE ram disk". The startup screen is a purple colour, not blue like my other 800XLs. I also found this BASIC program on another thread which confirmed the results of booting up with DOS 2.5 RAMDISK.COM : 10 GR.0:PRINT"TESTING...":PRINT 20 FOR Z=0 to 255:POKE 16384+Z,Z:NEXT Z:REM ***SET VALUES IN XRAM ADRESS RANGE 25 X=PEEK(54017):POKE 54017,X-20:REM ***SWAP BANKS 30 FOR Z = 0 TO 255:IF PEEK(16384+Z)<>Z THEN GOTO 50:REM ***READ BACK VALUES & COMPARE 40 NEXT Z:PRINT"64K UNEXPANDED XL/XE":END 50 PRINT"FOUND XL/XE RAM EXPANSION!":END

Thanks everyone. Booting with a DOS 2.5 disk was the answer! Thanks!

I have six 800XL computers and only one of them has a RamboXL memory upgrade. Is there a way of figuring out if an 800XL has the RamboXL upgrade without having to open up the computer?

I would like just the manual. I already have the discs. Send PM Thanks!

Some countries use a period to denote thousands, and a comma where we in the US would put a decimal point.

When I try formatting the head doesn't move. If I try writing the heads move.

I pulled out my second 1050 drive I had in storage and I am getting Error 173 (Bad Sectors at Format Time) when trying to format a disk (I've tried multiple disks), and Error 144 (Device Done Error). The drive boots and reads directories OK. The drive speed is 287. I have cleaned the heads. What else can I try?

Thanks everyone. I cleaned the heads and every disk is being read without a problem.

Another great suggestion! Thanks!

Thanks Nezgar. I'll open up the 1050 tomorrow and clean the read/write head as you suggested. The disks don't look like they lines etched in them, so hopefully things are not too bad. I'll report back.

I pulled out of storage some Atari data disks formatted with DOS 2.5. The first few times I accessed the disks on my 800XL/1050 combo I was able to perform a directory listing and open any data files (print to screen). For some reason I now cannot access anything on these disks. No file list, nothing. I sometimes get an Error 138 when trying to read the directory on one of these disks with MyDos. I can access many other disks with no problem. I tried using Copymate to preform a sector copy, but it found no data. Any ideas what's going on here or what else I can try?