Search found 291 matches

by stephen_usher
Fri Jun 28, 2019 7:00 pm
Forum: ATARI FOR SALE & WANTED
Topic: WANTED - Mega ST(E) or TT Keyboard.
Replies: 8
Views: 615

Re: WANTED - Mega ST(E) or TT Keyboard.

The TT/MSTE keyboards are extremely rare.

An Eiffel unit plus PS/2 keyboard may be easier to get hold of.
by stephen_usher
Fri Jun 28, 2019 3:59 pm
Forum: CHAT FORUM
Topic: Tips on downsizing selling my computer collection?
Replies: 5
Views: 515

Re: Tips on downsizing selling my computer collection?

You could try "Sell My Retro"

https://www.sellmyretro.com/

That's run by Rich Mellor who used to be a Sinclair stuff vendor back in the day.
by stephen_usher
Wed Jun 26, 2019 9:46 pm
Forum: CHAT FORUM
Topic: Floppy corrupted when used on ST and PC won't read it ?
Replies: 18
Views: 689

Re: Floppy corrupted when used on ST and PC won't read it ?

EDIT: Just for the hell of it, I wrote the .ST file back to floppy.. now the PC can read it.. but desktop.inf isn't there... but it shows on the ST :stars: EDIT2: Now its showing up on the PC :WTF: It's because the floppy serial number isn't unique probably and the PC is using a cached directory co...
by stephen_usher
Tue Jun 25, 2019 1:48 pm
Forum: CHAT FORUM
Topic: Floppy corrupted when used on ST and PC won't read it ?
Replies: 18
Views: 689

Re: Floppy corrupted when used on ST and PC won't read it ?

From what I remember the original TOS FAT12 is incompatible with MSDOS's version in subtle ways. One is the unique floppy ID, whichisn't unique on the ST. I thought that TOS 1.4 had fixed most of the original issues though. Are you sure it's not a head alignment problem? i.e. one drive is at one edg...
by stephen_usher
Mon Jun 24, 2019 3:29 pm
Forum: HARDWARE DISCUSSIONS
Topic: Reading & write to RTC 12887 ?
Replies: 51
Views: 2002

Re: Reading & write to RTC 12887 ?

The seconds count is a bit odd.. as basically once it gets to count of 10, it increased the "10 seconds" bits.. So it goes.. 00000000 (0) .. 00001001 (9) 00010000 (10 seconds) 00010001 (11 seconds) .. ( 5 ) ( 9 ) 0101 1001 (5x10 = 50 seconds + 9 = 59 seconds) Very odd way of doing things :shrug: Wi...
by stephen_usher
Sat Jun 22, 2019 5:12 pm
Forum: INTRODUCE YOURSELF
Topic: Hello from Oxford
Replies: 2
Views: 260

Re: Hello from Oxford

Welcome.... *waves from another part of Oxford* :-)
by stephen_usher
Sat Jun 22, 2019 2:12 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 794

Re: Cartridge Port: Would a buffer board help with problems?

I've just tried on the TT.... It helps a bit. More of the NetUSBee operates and it passes the tests, though doesn't actually send packets. As for changing the value of the resistors, I'll have to get some more resistors. As it was I had to use a mix of 4.7K and 5.3K(?) as I only had sets of ten resi...
by stephen_usher
Sat Jun 22, 2019 1:34 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 794

Re: Cartridge Port: Would a buffer board help with problems?

That's about as good as things get.. But does it help ? Nope. I'm guessing that the slow rise is causing a timing problem, with the address being read from the bus before the voltage has reached the 'high' level. Maybe the old power supply produced a slightly higher voltage which would mean that th...
by stephen_usher
Sat Jun 22, 2019 12:58 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 794

Re: Cartridge Port: Would a buffer board help with problems?

OK, I put some 4.7K pull-ups on the NetUSBee and...

IMG_1500.jpg
IMG_1500.jpg (62.03 KiB) Viewed 303 times

Still shark fins. It looks like something has a massive capacitance somewhere.
by stephen_usher
Fri Jun 21, 2019 10:59 pm
Forum: HARDWARE DISCUSSIONS
Topic: Reading & write to RTC 12887 ?
Replies: 51
Views: 2002

Re: Reading & write to RTC 12887 ?

6.jpg So CS going high doesn't clear the selected address I think... So the 68000 would put the address on the databus, CS = low, DS=low, but can't figure out what RW is supposed to be doing at that point :roll: From my reading it doesn't look at the 'R/W' line until the read/write part of the cycl...