Search found 693 matches

by ralcool
Wed Apr 14, 2010 1:50 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Dude, Sadly I live in the FAR south. Australia. A hell of a long walk and a plane ride. Having to desolder your roms is a bummer. or you could piggyback them. Quite a bit easier to solder too. I hope you can find someone to help . :( I'm confident the overclock mod will work. I guess we'll see. Can'...
by ralcool
Wed Apr 14, 2010 5:08 am
Forum: Hardware
Topic: Mega ST4 and tos...
Replies: 5
Views: 1195

Re: Mega ST4 and tos...

double post error
by ralcool
Wed Apr 14, 2010 5:08 am
Forum: Hardware
Topic: Mega ST4 and tos...
Replies: 5
Views: 1195

Re: Mega ST4 and tos...

again.... glitch...
by ralcool
Wed Apr 14, 2010 5:07 am
Forum: Hardware
Topic: Mega ST4 and tos...
Replies: 5
Views: 1195

Re: Mega ST4 and tos...

First problem. Unless you using the old style 28pin 1Mbit roms with (A16 on pin 20) Then the jumpering is slightly wrong for 27C010s (32pin) Newer roms keep OE on that pin.. and use pin2 instead. And the top 4 pins of the rom will be overhanging the socket. So Jumper A17/W2 Needs to be kept at 256k ...
by ralcool
Tue Apr 13, 2010 12:10 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Fail. Sorry, The Board coating was too old. Old Long term Light damage (a bubble in the protective coating) caused a major botch. The board was 95% perfect and overexposure to the developer (trying to erase the blotch) chem killed it. I have one (smaller) board left. And its too small for IDE pcb I'...
by ralcool
Tue Apr 13, 2010 10:49 am
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

OK. The GALs arrived today. Still waiting on the LS03s & sockets. Sourced some replaced transperant paper. And printed nicely! So we are developing right now. Then into the etching bath. ROM IDE IF coming soon! ish. Just deciding whether to use an LPT -2- GAL programmer hack, or dedicated device. Wo...
by ralcool
Mon Apr 12, 2010 2:28 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Gawd.. You think you have a process down pat..... So many attempts tonight to print a pcb mask onto clear OHP paper. My (ebay) ink is crap, runny, poorly printed tracks..... Grrr, I go visit a friend-use his HP printer with OEM ink. not much improvement. What????? Come home.....Mess around with prin...
by ralcool
Mon Apr 12, 2010 12:30 pm
Forum: Hardware
Topic: Mega ST 2, 4mb upgrade, only 2mb seen, but sometimes 4mb!
Replies: 22
Views: 2184

Re: Mega ST 2 DMA port problem/ hard drive not seen

Easy. Slightly fuzzy, but readable. http://dev-docs.atariforge.org/files/Mega_ST2-4_Schematic_2-19-1987.pdf Page 3 Count the pin number off the DMA chip, and Then to the ASCI port. Looking for continuity. (Eg DMA Pin36 [D0] to ASCI Pin 1), DMA Pin35 [D1] to asci pin 2...... D0 through to D7, H-ACK, ...
by ralcool
Mon Apr 12, 2010 5:10 am
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

I found today while looking at the Mega ST schematic for another thread. The Megas run a second set of 74LS244 driver/buffer chips for their ram.. Not on the just data bus this time. They- like the ST, have 74LS244/373s buffering and latching for the shifter/ram DATA The megas ALSO buffer the addres...
by ralcool
Mon Apr 12, 2010 4:01 am
Forum: Hardware
Topic: Satan / Ultra Satan Disk Alternatives...
Replies: 209
Views: 42555

Re: Satan / Ultra Satan Disk Alternatives...

If your just trying to backup your disks to PC- Why not try GemExplorer from emulators.com/download - Read Atari disks on a PC Darek is an Atari / Emulation Nut. You do know that you can format discs to be PC compatible? TOS 1.4 and higher do. (I often read my ST formatted floppies into a RAM disk, ...
by ralcool
Mon Apr 12, 2010 3:25 am
Forum: Hardware
Topic: Mega ST 2, 4mb upgrade, only 2mb seen, but sometimes 4mb!
Replies: 22
Views: 2184

Re: Mega ST 2 DMA port problem/ hard drive not seen

You said the boards had been wet- and suspect possible motherboard trace damge. One suggestion I will make is since the MEGA has an internal ACSI port- and it wires direct to the DMA controller (like the external port) Prehaps you should check for continuity on the 20odd lines between them. Then che...
by ralcool
Sun Apr 11, 2010 12:51 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Minor problem- I don't have an STE. HOWEVER- the ROM mount IDE project would work on the STE... simply an adjustment to the rom orientation for the IDE IF. add a few wires and presto. It looks like it would fit under the floppy in the rom sockets. (15mm height clearance), I can figure out the spacin...
by ralcool
Sun Apr 11, 2010 11:22 am
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

I love reading the work of engineers. Have you read this blog? Our very own Atari ST developer/ programmer Landon Dyer


http://www.dadhacker.com/blog/?p=995

http://www.dadhacker.com/blog/?p=1000
by ralcool
Sun Apr 11, 2010 9:32 am
Forum: Hardware
Topic: Satan / Ultra Satan Disk Alternatives...
Replies: 209
Views: 42555

Re: Satan / Ultra Satan Disk Alternatives...

I'm only using ROM sockets since its a bitch to find connectors that fit on the blitter- and we don't ALL have a blitter OR, MegaST expansion bus OR, room on our cpus due to emulators & speed upgrades. And the rom sockets wire directly to the cpu data/address bus. Just a few wires missing. Easy. Rea...
by ralcool
Sun Apr 11, 2010 8:37 am
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Since I'm basically sitting here waiting for parts (ICs & sockets) to show up. I've continued playing with ExpressPCB. Its fun actually. Therapeutic... So I've traced out the High Density upgrade mentioned on the Atari Hardware page. A nice little two chip design for the internal drive. 144_ctrl.zip...
by ralcool
Sun Apr 11, 2010 4:16 am
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Thanks nativ.. Outside. by Uwe. (I also grabbed the HDDRIVER demo) While the translation is a bit sketchy - it seems to be what I was asking about. I downloaded it- and will try it sometime. When I have a CF/HDD running. I've found my etching chemicals, and two old spare blank pcbs.. So I'll start b...
by ralcool
Sat Apr 10, 2010 4:12 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Now that we have CF based IDE connected data sources. Hey its modern FAST flash ram, in a convenient package- that we can plug directly into the cpus data/address lines. (Just like 486 Local BUS) We normally use them now as silent/ cool /lowpower harddrives. Why don't we have a TT-RAM emulater/page ...
by ralcool
Sat Apr 10, 2010 12:15 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

If anybody wants the pcb files (Openable in Express PCB) Just let me know. They print brilliantly as a mask for positive resist PCB production.

First free PCB software I've used (lately) that lets me...... And have the option of professional PCB production... GOLD!
by ralcool
Sat Apr 10, 2010 9:29 am
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Nice project Spiny, At least we know where all our money goes..... Tonight I decided to lace up the circuit for a 72pin simm upgrade.. Also ties in nicely with the 16mhz mod (Given it needs a 16mhz input and power...) http://i821.photobucket.com/albums/zz140/ralcool/16mhz_72pin_proto.jpg I don't hav...
by ralcool
Fri Apr 09, 2010 3:09 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Aww, Shucks.. I just love playing with electronics... :oops: I'm not doing this for any benefit, other than the joy of old machines. And its mine. :D And the bike... EFI and REAL hardware.....! Fully restored in my workshop.....hehehe, OT no, its 1984! Oops, Did I post THAT here...! Wrong forum.. so...
by ralcool
Fri Apr 09, 2010 9:51 am
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Subject to further checking and ultimately test... Here are completed Circuit board designs for the '16Mhz ST' and 'LASCAN '... LH Board 16mhz mod, RH Lascan. Both single sided, and appear correct. The 16Mhz_ST.zip was in Dutch! But makes sense... I think. Translated.....Thanks Google Translate........
by ralcool
Thu Apr 08, 2010 1:18 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Well, I just paid for a 72pin RAM socket from Ebay... So expect a shifter mounted pcb 4Mb upgrade soon.... When I finish the layout, and create a custom component for the 72pin socket. Sigh.
At least I have a couple of 72pin 4 & 8Mb simms in the box....Fast Page blah blah.....
by ralcool
Thu Apr 08, 2010 12:40 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Here are three different 'programmers' built over the years. A JDM, Fluffy2, and a EEPROM pogrammer. JDM for 12C508/16F84s Fluffy2 for Atmel Chips Last for 64/128/256/512k EEPROMS. http://i821.photobucket.com/albums/zz140/ralcool/IMG_1088s.jpg All generally still in use, and run from my reliable old...
by ralcool
Thu Apr 08, 2010 12:21 pm
Forum: Hardware
Topic: Modified ST hassles
Replies: 887
Views: 153534

Re: Modified ST hassles

Um everywhere. I've got parts coming from Thailand, Netherlands, HongKong. I search for things like... 'Resisters LOT'. '74LS'... etc And get 'Grab bags' of stuff. Most things are cheaper in bulk. I've been using parts from my 'supplies' for years. and still have parts/crap everywhere. Just now a li...

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