[Bodyshots]

got a box o joysticks from Bodyshots, Was shipped promptly and packed well.

[***SOLD*** Textronix oscilloscope]

damn, if i only had the scratch...

[CartDump (Jindrich)?]

larry, are you using the adaptor?

[Estimated Price for all this Atari Equipment]

Anybody- what is a Centurian disk drive? Never seen or heard of that one. European/UK?

 

-Larry

could only find one other reference to those drives, someone said they were 810 drives in a metal case with the archiver add on

[What is a good EEPROM programmer?]

i use a g540 for most things these days, it even programs gal chips

[[ATARI 800XL] Using extension bus]

I think the 74HC are best suited but someone more knowledgable could confirm.

 

I guess with the propogation delays... add up to get your worst-case scenario. 1 cycle = about 558 ns, you want to get in under half that. I remember reading that the longest acceptable latency for RAM was 250 ns.

The PDFs for the custom chips Pokey & GTIA have the timing diagrams showing the relationship among Phi2, r/w, CS etc.

 

74HCT, the HC is high speed cmos, HCT is high speed cmos, ttl compatible

[Atari 8-bit Hardware For Sale]

I believe the difference is that one is a dot matrix and one is a daisy wheel printer.

you're right... i found info online...

[Atari 8-bit Hardware For Sale]

ok, which of the 2 x?m printers is the better? xdm or xmm. i know nothing about them....

[CA2001 G5 Error indication]

Actually, it was mine. I scanned the schematics years ago from the service manual and released them on to a BBS Now look where they are. The manual came much latter.

 

James

 

yup, james was kind enough to provide scans, i did ocr and manual editing on them to fix ocr problems. currently i am working on a parts list i will be inserting into the indus FSM.

[Interesting find inside one of my 400's]

is there one like this for the 800?

[Is the black box or the MIO still better than current upgrades?]

IIRC the Adaptec 4070 is a SCSI to RLL controller, while the Adaptec 4000/4000A is SCSI to MFM.

RLL is a slightly more advanced encoding technology that allowed increasing storage density 50% for the same media versus MFM, but it did require a very accurate drive mechanism.

 

-begin memory dump-

 

all mfm/rll drives are rll, rll stands for run length limited iirc, if i remember right, mfm is rll 1,3 and what was called rll was rll 2,7. the main difference between the 2 is the speed/frequency (it is one or both) of the datastream. 'rll' was 50% faster and/orhigher freq it does not require any more accurate mechanism than 'mfm' it needs a read amplifier and write amplifier that can handle the datastream, i salvaged many "dead" st225's that had been run on a 'rll' controller and failed as i could remove and replace the amplifiers and add heat sinks and compound to them. then there was arll from perstore(sp) it promised 90% capacity increase on a mfm drive but was better at burning up mfm read/write amplifiers than running a mfm drive on a rll controller.

 

-end memory dump-

[Atari Indus GT disk drive - equivalent to a 'Happy' drive? Better?]

i think the reason you saw duplication upgrades for the atari drives but not the indus was the processor in the device, where the atari drives use a cost reduced 6502 compatible chip, the indus uses a z-80, and while assembly for most 8 bits is somewhat similar, it is different enough to cause a programmer issues, not to mention hardware differences in the different cpus.

[What's the latest Atari related thing(s) you've bought on ebay?]

another indus gt to replace my 2nd one that seems to have vanished.

[Spy Hunter arcade reset loop]

have you checked out http://forums.arcade-museum.com/archive/index.php/t-217250.html

[Spy Hunter arcade reset loop]

check voltages and capacitors.

[real serial port on atari]

Hard to say what you actually need.

 

The standard solution for this problem is to use a 850 or 850XL which provides four (or one) "real" serial port, i.e. RS232. Comes with drivers. Due to the nature of the SIO port, serial IO does not mix with disk transfer, though. The only other option would be to build a customized serial interface and connect it to the PBI of the XL series. The 65xx microprocessor series comes with a good collection of port chips, including UARTs you would need to build a serial port. That, plus a couple of voltage adapters (1488/1489 IIRC) should give you a serial port that can work "in parallel" to disk transfer, independent of SIO.

somewhere i have an 850... i just find the bit banging serial of the SIO port horribly.......ineligant. if i do build an actual serial port i'd use something other than 1488/1489 pair that way i won't need +12v iirc, only 5v for the maxim serial drivers...

[AtariVox rev2]

is it possible to get some of the bare boards? and where did the enclosures come from?

[real serial port on atari]

i've been looking for a way to hang a real hardware based serial port on ataris. anyone have schematics or designs?

 

[alignment disks.]

While I have never purchased one of these from this company, I did find them while searching for a Commodore 1541 alignment disk. They seem to sell Dysan equivalent disks:

 

http://www.accurite.com/AAD.html a bit expensive though.

 

If you are looking for a DSDD disk for an Atari drive like the XF551 Best sells those as well:

 

XF551 5 1/4 inch DSDD Dysan Alignment Disk CB101285 $55

 

 

looking for ssdd, dsdd, dshd and 720/1.44

[alignment disks.]

anyone know where i can find ss and ds 5.25 inch alignment disks?

[Marketplace Responses - First Come First Serve?]

not here om AA but i'm still annoyed about getting poached out from under. i replied to a classified ad about some atari stuff, and the person sent me contact info (i told em if they still had it i would buy it) contacted them shortly after recieving their info and they informed me that they had just sold it. it's annoying as heck as i dont have a lot of disposable $ so i buy fairly carefully. i'd lay odds the pieces are going to end up on ebay

[Bad Video - Diagnostics?]

he said it was U3

[ATR-8000 (and other) CP/M System disks here]

is there information anywhere as to what addresses the various ports on the atr 8000 are at.

[ATR-8000 (and other) CP/M System disks here]

If I understand it correctly CP/M uses only the Z80 processor on the ATR8000 mainboard, while the Co-Power88 daughterboard is for running DOS

 

 

or CP/M 86

[Atari 8-bit Hardware For Sale]

what disks do you have with the atr8000?