Atari-Forum

It is far beyond my knowledge to offer anything to this discussion. However I did come across this page, the ST prototype in pure TTL. And of note- there is a link to the video shifter circuit board image. http://www.bambi.net/atari/atari_st_prototype.html The custom chips in the Atari integrate muc...

Tell yer what.. Take a nice close up pic of the upgrade. We can easily work out what it needs. Most ram upgrades use the same connections to the motherboard anyway. The order of the address lines isn't important. Only RAS/CAS is. We should be able to see those if there is any silk screening. I'll be...

"Private there is a piece of poo on the end of this rifle"..... "Not this end Sir!"

Funnily enough Spiny, Even though months ago I scored those Sony drives to complement the HD mods- and subsequently learnt to modify them.. The drive in my ST is a MF355F-250MG Rev L. The external one is a spare unsold Sony though. I put up pics of a Sony & Alps FDD mods in my thread - but not my ow...

Judging by the connections to DS0,DS1 (Pin 19 &20 of the Yamaha) , and to U32 Pin8 (and9) of the LS02.

Notice also the cut track on the board.. likely from Pin 10 of the LS02.

Its a floppy A/B switch for internal/external boot select.

Great!!

This is when having access to schematics of even an old design will benefit those in the future.

At least you can can talk to the guy that knows.

I'm quite happy it runs again. We need your PAK powered STacy to prove the next round of HD mod...

ST.

Looks like Darklord and myself having trouble in the workshop. So, I tried to write my spare 20V8 GAL with the HDFLOP12 code soon after pakman posted the files. Would you believe my PC crashes with BSOD citing the port driver is at fault. It appears to write, then crashes on either reading or verify...

I'll be wiring up some veroboard tonight to try it. A few header pins and a socket for the GAL. (I have one old spare 20V8.. hope it still works) Looking at the WD1772 data sheet.. I thought the d0,1 control lines went high for 6ms. Anyway, I'll try it. Then HDFLOP13 when finished. Knowing HDFLOP12 ...

maybe someone has a "known not working in 16mhz mode" chip they want to send for me to test ? Maybe Darklord still has his defective chip? After being replaced by the Ajax. I'd love to include the 6ms step switching into the new board I want to send him. (His fixed TOS1.4 needing a driver and all.....

Hi Holger (I presume) , The design like suggested makes sense... switch the WD at the end/beginning of the clock cycle. Not anytime between. It would be even better to include step rate detection and force... shown by Exxos. GAL Pins to spare. Reading the WD1772 manual decribes the command string. W...

I always was amused by the Radio picking up motorbike, hair dryers and the like! I recall I could not listen to Kiss 100FM in London because the Falcon killed this frequency! ;D Not as amused as being able to pick up my neighbour computer output on my black & white TV during my Uni days :lol: :lol:...

Um , The modification you made needed a reprogrammed GAL right?

Is this the final reason it won't boot, other than undoing the changes.

The broken pin.. fine... But what of the changes?

I wish you the best of luck... nothing more disappointing than something that did work.....


ST.

I would love to see how you configured the step rate logic for seemless integration for your HD mod. Seem its based on being wired to D0 & D1.... (Pin5 and 6 of the WD) just looking..... :mrgreen: You can see why you removed the WD from the board. A number of signals modified. Lots of cutting. Golde...

I wasn't originally, but after a brief search, I found what you are talking about. http://www.atari-forum.com/viewtopic.php?f=15&t=17087 DSCI0170_1s.jpg IDE, ISA (ET4000), TOS2.06 and FastRAM...... Wow. Some seriously cool gear available in the mid 90s' ST. http://translate.google.com/translate?hl=e...

Slightly cool. A1000 running TOS1.02

http://www.youtube.com/watch?feature=en ... 4ta4OYhsEY

Ducking for cover......

ST.

PS, While talkng about nothing.. My new Fav band... "Nero"... Lots of old school synth and 80's beats.. Lovin' it...

On the Ppera circuit, DTACK gets generated by the GAL, then fed via a HC03 to invert and delay, to the cpu. In the GAL program DTACK also serves to support writing to the ROM addresses too. Normally illegal. Another feature to include not catered for in the Mach210 program... ROM writing, and TOS 1....

Dude, for our circuits even 1/8w are fine. 1/2w are rather large and overkill. 1/4w 5% resisters are the most common, and all over the ST. I like to use 1% tolerance metal film 1/4w resister in my mods. I bought a massive bag of all labelled sizes for around $A40. Anything a schematic asks for is us...

I suspect the overlap clock timing might explain why substituting 32mhz into the 16mhz input of the 8/16Mhz mod. Didn't work. ..... Good work so far Exxos, overclocking the main board wasn't on my todo list. But it is interesting to see someone try. 8) I have a question.... and its a little toward j...

Seems the need for the STe version is gaining momentum. As you know the 32mhz powered HD mod prototype is completed & suitable. Once fitted, you will only have to run a small utility to slow the step rate- or fit TOS 2.06. Having an Ajax already is a great first step. I'll be creating a batch of the...

I will try it and report back.


ST.

My German is pretty crap... but upload the Magnum_ST_Einbauanleitung.pdf to Google translate.

That will be better than what I can tell you.

ST.

I've never given two thoughts about PC formatting. Its been compatible since TOS1.4, so your STe should have no problem. Otherwise, A PC formatted disc will work fine in any ST/TT whatever. But only 720k formatted. Use the format command on your PC ...FORMAT A: /T:80 /N:9 Either block the HD hole on...

Lots to answer. High Speed serial, can be simple or hard. But always a modification to the MFP chip. (Or add a second one) You can have speeds up to 115200, but the Standard ST @8MHz from everthing I have read without my own testing, Is that it is at its best at 38400bps. Lack of FIFO buffering and ...

The images one can find with a bit of thread mining.... :D These two boards- The IDEAL_IDE interface & The Magnum 8Mb need to be combined! (They both already support TOS2.06 control) Magnum_IDEL.jpg The IDEAL_IDE board is so incredibly similar to my Compo TOS2.06 only board it isn't funny... just th...

I wonder how many of us.. never knew- or overlooked Uwe Schneiders' page. http://www.uweschneider.de/Download.php?lang=en There is the Magnum 8Mb RAM upgrade in all its glory. Using the Mach210 CLPD. ST/STE/TT/Falcon.....all versions. Now some claim this chip is long out of production- but ebay has ...