Search found 184 matches

by SteveBagley
Sat Apr 18, 2020 11:12 pm
Forum: Hardware
Topic: Atari SC1224 and RGB Questions
Replies: 6
Views: 516

Re: Atari SC1224 and RGB Questions

To be honest, you may well get away feeding the monitor directly from the LM1881 feeding the HSync input from the composite sync output of the LM1881. I used to drive an SC1435 like this for several years …
by SteveBagley
Mon Mar 30, 2020 7:54 am
Forum: Hatari
Topic: TimeWorks 2 Publisher on Hatari
Replies: 12
Views: 2009

Re: TimeWorks 2 Publisher on Hatari

Hi folks, Just looking in here because this thread was mentioned on the EmuTOS mailing list. I found a legal copy of Timeworks 2 that I had been given many years ago by another user. I installed it using Hatari 2.2.1 (4MB MegaSTe emulation, mono monitor) and TOS 2.06 on a Linux system. It initialis...
by SteveBagley
Tue Mar 10, 2020 12:53 pm
Forum: Professionals
Topic: Atari Sparrow DSP Board
Replies: 0
Views: 659

Atari Sparrow DSP Board

Idek's post about his Atari Sparrow DSP board over the weekend prompted me to do a little digging and I found this interesting diagram on the Atari HQ CD -- obviously intended for a fitting document for the prototype. Not much new information other than (judging by the filename, DSPBOARD.GEM) that i...
by SteveBagley
Sun Mar 08, 2020 10:26 am
Forum: For sale / Wanted
Topic: FS: ATARI Prototype Sparrow Rev. A
Replies: 25
Views: 2486

Re: FS: ATARI Prototype Sparrow Rev. A

How nice! This looks like a final version, when comparing to this setup: We can see that the CPU card doesn't contain neither the DSP nor FPU yet. That clearly has a 68000 installed, but I think these cards give us a clue into how the Sparrow and Falcon were developed. We know the Sparrow is a heav...
by SteveBagley
Sun Mar 08, 2020 12:16 am
Forum: For sale / Wanted
Topic: FS: ATARI Prototype Sparrow Rev. A
Replies: 25
Views: 2486

Re: FS: ATARI Prototype Sparrow Rev. A

Thanks.
by SteveBagley
Sat Mar 07, 2020 8:27 pm
Forum: For sale / Wanted
Topic: FS: ATARI Prototype Sparrow Rev. A
Replies: 25
Views: 2486

Re: FS: ATARI Prototype Sparrow Rev. A

Do you have any hi-res photos of both sides?
by SteveBagley
Mon Oct 14, 2019 5:07 pm
Forum: Hardware
Topic: STFM doesn't boot, CPU halted. How to find what's going wrong?
Replies: 13
Views: 3959

Re: STFM doesn't boot, CPU halted. How to find what's going wrong?

Using a logic analyser to figure out how far into the boot process it's getting sounds like another promising line of inquiry. I don't own a logic analyser, as you've guessed, but might be able to find someone who'll let me borrow one. I bought a cheap 8-bit clone of a Salae logic analyser off Amaz...
by SteveBagley
Sun Sep 22, 2019 9:05 am
Forum: Applications
Topic: MagicMac
Replies: 8
Views: 4249

Re: MagicMac

The problem is that you wont even be able to compile a new version of AtariX on newer Macs. But it won't be easy to fix that. I managed early in the year to get a version the compiles and runs in 64-bit up to a point… I got it to boot the kernel and run up until it tried to load the screen drivers…...
by SteveBagley
Wed Aug 21, 2019 12:44 pm
Forum: Hardware
Topic: HBS240/640 L1 design
Replies: 4
Views: 1008

Re: HBS240/640 L1 design

the HBS640 manual claims that it is using 64KB cache for data and instructions. And indeed two KM682578 32K x8 SRAMS are populated on the PCB. But still they use 8K x8 71B74 tag RAMs. I checked the KM682578 A14 line and it is indeed connected to CPU's A15 - which is what I would expect. So it's pro...
by SteveBagley
Fri Aug 02, 2019 6:01 pm
Forum: Hardware
Topic: DIY Fpu Unit for STFM
Replies: 35
Views: 8038

Re: DIY Fpu Unit for STFM - possible?

Have you thought about making this as a board that plugs into the ROM sockets and the ROM sockets plug into? You can pick up a lot of the signals needed from there (A1—A17, D0-D15), which would mean you'd have to pick up a few signals from elsewhere… You'd also be able to decode TOS 2.06 and IDE on ...
by SteveBagley
Sun Apr 21, 2019 3:01 pm
Forum: Website Discussions
Topic: https for atari-forum.com
Replies: 42
Views: 26172

Re: https for atari-forum.com

And then maybe HTTP to HTTPS redirection could be activated by a profile setting ? (off by default, to satisfy non compatible HTTP browser users) The HTTP User agent might be a better option to use -- by default redirect to https:// unless the User Agent matches a set of whitelisted Atari browsers?...
by SteveBagley
Fri Mar 08, 2019 8:27 am
Forum: Demos
Topic: Bird to be alive demo
Replies: 13
Views: 22874

Re: Bird to be alive demo

Have you ruled out a corrupted copy of the demo software? I think you’d see Blitter problems on the Desktop as well.

Steve
by SteveBagley
Sat Mar 02, 2019 6:39 pm
Forum: For sale / Wanted
Topic: [Closed] 2019 clearance 01 - Falcon/TT/ST stuff
Replies: 10
Views: 6818

Re: 2019 clearance 01 - Falcon/TT/ST stuff

Hmm. I’m interested in the SH204 if it’s still available…

Steve
by SteveBagley
Sat Mar 02, 2019 12:05 am
Forum: News & Announcements
Topic: Wikipedia article about Atari Computing
Replies: 5
Views: 4574

Re: Wikipedia article about Atari Computing

No idea how you can add more "published, reliable, secondary sources that are independent of the subject" about an Atari magazine that was never mentioned in the Guardian or on BBC News ;) Didn’t the last issue of ST Format mention it was starting which could be referenced, also there should be som...
by SteveBagley
Thu Feb 14, 2019 2:21 pm
Forum: Gallery
Topic: Mega STe rescued from hell.
Replies: 17
Views: 6851

Re: Mega STe rescued from hell.

Oooh -- what's the story behind that machine?

And the million dollar question -- does it work? :)

Steve
by SteveBagley
Mon Feb 04, 2019 4:04 pm
Forum: Hardware
Topic: Pro VME Hypercache 030
Replies: 14
Views: 2761

Re: Pro VME Hypercache 030

Arne wrote:Case closed. I should have checked more thoroughly :oops:
Beneath three of the four ROM sockets are three MK41H80 Tag RAMs.
Heh :) Saves me typing out an explanation of how it works using just static RAM (at the expenses of a few wait states)

Steve
by SteveBagley
Mon Feb 04, 2019 11:54 am
Forum: Hardware
Topic: Pro VME Hypercache 030
Replies: 14
Views: 2761

Re: Pro VME Hypercache 030

How does the Hypercache know that if specific data word is stored in the L2 or not? As I see this is the job of these TagRAMs. How did Pro VME without? TAG RAM is just static RAM with integral comparators that compare the data stored in memory with the data on the data bus to see if they are equal ...
by SteveBagley
Mon Jan 07, 2019 7:11 pm
Forum: Hardware
Topic: Recommended hardware tweaks/mods for an Atari STe
Replies: 27
Views: 8248

Re: Recommended hardware tweaks/mods for an Atari STe

There are extremely few STE's using SIPPs, and the bad dma-thing... well... it pops up every couple of years and every time we must spend a ton of time convincing everyone and their mother their dma isn't bad all because an entry in the notator sl faq. As they say, being forwarded, is being forearm...
by SteveBagley
Mon Jan 07, 2019 3:05 pm
Forum: Hardware
Topic: Recommended hardware tweaks/mods for an Atari STe
Replies: 27
Views: 8248

Re: Recommended hardware tweaks/mods for an Atari STe

but one problem that the first STE had was a faulty DMA stream, many call it the Bad DMA chip, but i do think to read that was more in it, then just the DMA chip, an updated version of the DMA should fixed it. so if you have the faulty DMA, you will need to fix it before you attach and hard drive t...
by SteveBagley
Sun Oct 14, 2018 9:02 am
Forum: Hardware
Topic: Beginning of very long journey
Replies: 264
Views: 74949

Re: Beginning of very long journey

Another question came to my mind - what would you find more benefitial fo SCSI - an external (Falcon type) connector, or rather an internal pinheader? When I think about it, I am inclined to go for an internal PH. An external connector could be added via riser card, afterall. What do you think? Cou...
by SteveBagley
Sat Sep 08, 2018 2:02 pm
Forum: Hardware
Topic: Dead Falcon resuscitation
Replies: 42
Views: 15995

Re: Dead Falcon resuscitation

Just a thought, but you do have the jumper in place on the expansion port? I don’t think falcon's boot without it…

Steve
by SteveBagley
Tue Aug 07, 2018 7:11 am
Forum: Hardware
Topic: Atari ST hardware problem
Replies: 14
Views: 3169

Re: Atari ST hardware problem

It’s almost certainly a RAM issue — the pattern you are seeing is TOS's memory test and the machine crashing out before clearing the screen. I had similar problems with an STM (see http://atari-forum.com/viewtopic.php?f=15&t=27414 ).

Steve
by SteveBagley
Fri Jul 27, 2018 2:05 pm
Forum: For sale / Wanted
Topic: Wanted: Dead or dying TT030 systemboard
Replies: 8
Views: 1988

Re: Wanted: Dead or dying TT030 systemboard

You can still get bare unpopulated TT boards from Best Electronics according to their website -- might be easier than desoldering a dead one¬

Steve
by SteveBagley
Wed Jul 18, 2018 3:10 pm
Forum: Applications
Topic: Thames TV and Cyber Paint
Replies: 0
Views: 1568

Thames TV and Cyber Paint

When we got our first 520STE in 1990 (the Power Pack model -- in the UK, from Evesham Micros), it came with a free magazine in the box about the ST and what it could be used for. I suspect it was mainly reprints of bits and bobs from one of the UK ST magazines… I remember one of the articles in the ...
by SteveBagley
Tue Jul 10, 2018 9:22 am
Forum: Hardware
Topic: 520ST Mod - Help ID'ing Please
Replies: 3
Views: 1181

Re: 520ST Mod - Help ID'ing Please

Looks like it is soldered across R113 which means it should have the chroma subcarrier clock frequency on it -- where does the other end of the signal goto inside the modulator tin (the lid should lift up)? That'd probably give a better idea of what it's for. At a guess, it's either feeding the subc...

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