Search found 184 matches

by SteveBagley
Tue Jan 07, 2014 1:56 am
Forum: 680x0
Topic: Bad Mood : Falcon030 'Doom'
Replies: 2353
Views: 374505

Re: Bad Mood : Falcon030 'Doom'

dml wrote: Can PureC/AHCC be told to pass strictly on the stack? e.g. perhaps for varargs stuff.
If memory serves (it's been 16 years and I was mostly a Lattice user) the cdecl directive worked to force stack-based args in Pure C.

Steve
by SteveBagley
Mon Dec 16, 2013 11:54 pm
Forum: Hardware
Topic: identify? unknown card from STFM
Replies: 5
Views: 1848

Re: identify? unknown card from STFM

Chandler wrote:
Shockwav3 wrote:That's a Sack PC Speed (a PC emulator card).
ok thanks

don't suppose anyone has the software for it?!

:)
http://www.atarimania.com/utility-atari ... 23201.html

Steve
by SteveBagley
Thu Nov 14, 2013 12:31 am
Forum: Hardware
Topic: Project idea: 16MHz CPU with faster ST RAM
Replies: 46
Views: 7827

Re: Project idea: 16MHz CPU with faster ST RAM

I came across an interesting Amiga accelerator project a while back that seems to be doing similar things.

http://www.majsta.com

Steve
by SteveBagley
Wed Nov 06, 2013 1:09 pm
Forum: 680x0
Topic: Chaining a non-ISR routine to an ISR
Replies: 7
Views: 3410

Re: Chaining a non-ISR routine to an ISR

I don't think this is possible with any stack address tweak. If the interrupt comes in the middle of an OS call or during another interrupt, already in supervisor mode, you can't drop the S flag but still get it back at the end of the usermode ISR. That's a good point actually, I hadn't thought of ...
by SteveBagley
Tue Nov 05, 2013 7:56 pm
Forum: 680x0
Topic: Chaining a non-ISR routine to an ISR
Replies: 7
Views: 3410

Re: Chaining a non-ISR routine to an ISR

I am aware of reentrancy problems with my proposal. I want to avoid running in Supervisor mode...and experiment with context switches aswell. If there is no easy way, I'll probably just run the routine in Super and things are ok. Well the mechanism described will work fine and is the way to do a co...
by SteveBagley
Tue Nov 05, 2013 7:10 pm
Forum: 680x0
Topic: Chaining a non-ISR routine to an ISR
Replies: 7
Views: 3410

Re: Chaining a non-ISR routine to an ISR

You can definitely do something like that to achieve this but you'll need to do a bit more stack fiddling to get it to work -- it may also vary between 68000 machines and everything else. Basically, you need to manipulate the stack to go from: PC (return address) SR to: PC (return address) address o...
by SteveBagley
Sun Oct 13, 2013 8:21 am
Forum: Hardware
Topic: TOS boot/init sequence ?
Replies: 4
Views: 2141

Re: TOS boot/init sequence ?

There's an AUTO folder variant of MonST which would get executed before it loads the desktop. If you stuck that in your boot sequence you could see where it crashed which might give a clue or two as well.

Steve
by SteveBagley
Tue Oct 08, 2013 5:49 pm
Forum: Website Discussions
Topic: Bad Influence - Atari's featured
Replies: 14
Views: 10422

Re: Bad Influence - Atari's featured

There's a bit in one of the GamesMasters comparing the A1200, Falcon and Acorn A3010 too from around the same time period.

And, of course, an Atari ST featured quite prominently in and episode of the BBC adaptation of 'Elidor'…

Steve
by SteveBagley
Tue Sep 24, 2013 11:03 pm
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 189
Views: 65360

Re: STe - Bad DMA Chip

Repairs in notts ? Who was that then ? Seems to be a busy area around staffs of late with Atari activity... Though I been asleep for the past few years ;) This was back in the 1990s, C&P Rossiter was the firm IIRC (run out of the guys front room). I've also just got back into the swing of things as...
by SteveBagley
Tue Sep 24, 2013 10:19 pm
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 189
Views: 65360

Re: STe - Bad DMA Chip

Thats the thing though, the STE does have DMA buffers.. Its what made me think Atari thought there was bus problems and added the buffers on the STE, but as everyone knows, it didn't work, so Atari produced a updated DMA. They are on the ASCI port side of the DMA chip, I was thinking between the DM...
by SteveBagley
Tue Sep 24, 2013 9:15 pm
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 189
Views: 65360

Re: STe - Bad DMA Chip

Along these lines, this post from Frank Lukas way back when caught my attention… Frank pretty much comes to similar conclusions to you. Specifically: Another problem occured with the DMA-chip (see my other post). A long time ago, in this computer the two ROM chips were replaced by six EPROMs with TO...
by SteveBagley
Thu Sep 19, 2013 10:42 pm
Forum: Hardware
Topic: VELOCE STE BOOSTER IMAGES
Replies: 22
Views: 5233

Re: VELOCE STE BOOSTER IMAGES

Though I could understand Fast-Ram running at 16mhz, just like ROM, Though the whole ST-ram would have to be replaced on the veloce ( I dont know if it does or not) but the interesting thing is , it shows as running at 117%, not a big difference really though.. I do not know if it has "fast ram" or...
by SteveBagley
Thu Sep 19, 2013 9:11 pm
Forum: Hardware
Topic: VELOCE STE BOOSTER IMAGES
Replies: 22
Views: 5233

Re: VELOCE STE BOOSTER IMAGES

I've also been given it some thought -- which are outlined below. The ST and STE buses are virtually identical -- and run at 8MHz. The MegaSTE runs the CPU at 16MHz, but does so by using cache ram between the CPU and the main bus (which is still at 8MHz). This allows the CPU to access data from the ...
by SteveBagley
Wed Sep 18, 2013 10:44 am
Forum: Hardware
Topic: VELOCE STE BOOSTER IMAGES
Replies: 22
Views: 5233

Re: VELOCE STE BOOSTER IMAGES

Taking another look at the board, I do wonder where its generating the 16mhz from, It could be generated internally in the chips, though one day I might trace where the clock pin on the 020 cpu is going, its possible that the 020 cpu could be overclocked a little higher , though it depends where th...
by SteveBagley
Tue Sep 17, 2013 3:54 pm
Forum: Hardware
Topic: VELOCE STE BOOSTER IMAGES
Replies: 22
Views: 5233

Re: VELOCE STE BOOSTER IMAGES

Taking another look at the board, I do wonder where its generating the 16mhz from, It could be generated internally in the chips, though one day I might trace where the clock pin on the 020 cpu is going, its possible that the 020 cpu could be overclocked a little higher , though it depends where th...
by SteveBagley
Tue Sep 17, 2013 1:53 pm
Forum: Hardware
Topic: VELOCE STE BOOSTER IMAGES
Replies: 22
Views: 5233

Re: VELOCE STE BOOSTER IMAGES

At the very least, there will need to be some software that uses Maddalt() to register the extra RAM with TOS.
This rview suggests that it also configures the processor…

Steve
by SteveBagley
Thu Sep 12, 2013 10:11 pm
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 189
Views: 65360

Re: STe - Bad DMA Chip

Remember the 25913 chip is successfully used in the Mega and STFM lines. Also, switching just the DMA chip on my STE fixed the issues with the HDD -- the driver and scsi controller (both GESoft -- a top link controller and their driver) worked fine for over a year until I switched to HDDriver which ...
by SteveBagley
Thu Sep 12, 2013 1:29 pm
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 189
Views: 65360

Re: STe - Bad DMA Chip

Update: There's a C025913-38 inside. So, time to start hunting for a good one, or maybe a more recent STE. In the meantime, I'll just continue to use it until I see some sign of malfunction (doing frequent backups of the card of course). It's a really annoying bug -- my STe in the 1990s ran for goo...
by SteveBagley
Wed Sep 11, 2013 11:03 pm
Forum: Hardware
Topic: AdSpeed circuit diagram ?
Replies: 15
Views: 3308

Re: AdSpeed circuit diagram ?

I saw that Adspeed also mentions it can speed up TOS also. The only way I can think of is to simply check the /ROMx lines, then if any ROM is enabled then switch into 16mhz mode. I was just wondering how Adspeed did it more than anything, or at least what lines Adspeed was actually monitoring I ima...
by SteveBagley
Wed Sep 11, 2013 5:49 am
Forum: Hardware
Topic: AdSpeed circuit diagram ?
Replies: 15
Views: 3308

Re: AdSpeed circuit diagram ?

The circuit diagrams and GAL code for the MegaSTE would be a good place to start creating a replacement board, surely? Both of which are available online. The GAL code is in one of those isos full of atari internal files.

Steve
by SteveBagley
Sat Sep 07, 2013 9:38 am
Forum: Hardware
Topic: ST-BOOK ROM dump?
Replies: 199
Views: 44825

Re: ST-BOOK ROM dump?

ye its the ram drive think looking there is a push at to that address you can just nop it out and the tos wont make the ram drive do an auto install device and see if it pops up as drive P I don't think $D40000 and $E80000 are used for the ROM drive (P:), since they both lie outside the TOS 2.08 ch...
by SteveBagley
Fri Sep 06, 2013 11:50 pm
Forum: Hardware
Topic: ST-BOOK ROM dump?
Replies: 199
Views: 44825

Re: ST-BOOK ROM dump?

I wonder if Steem SSE supports this BIOS? I couldn't get it working. TOS 2.08 access memory at $D40000 during boot up which bus-errored in Hatari (possibly incorrectly -- my MegaSTE happily allows me to read from there) unless I set it up as a 14MB hybrid. And it needs to be in High-res. it's possi...
by SteveBagley
Fri Sep 06, 2013 11:07 am
Forum: Hardware
Topic: ST-BOOK ROM dump?
Replies: 199
Views: 44825

Re: ST-BOOK ROM dump?

can someone post the images are aok????? please... i ordered a new programmer as my copy willem is gubbed so it will take me 10 days or so to secure plcc 27c4002 and OTP and copies see last few pages for rom images I've booted it fine in Hatari without issue -- interestingly, it really doesn't unde...
by SteveBagley
Thu Sep 05, 2013 3:55 pm
Forum: Hardware
Topic: [PICS] Installing a Marpet XTRA Ram 8 in Mega ST
Replies: 20
Views: 3204

Re: [PICS] Installing a Marpet XTRA Ram 8 in Mega ST

I seem to remember there was a version of the XtraRAM +8 for the STe and MegaSTe as well. Evidence? Reading about it in the ST magazines back in the 1990s. In fact, there's a picture of the board in this issue of ST User -- http://www.atarimania.com/mags/pdf/atari-st-user-issue-97.pdf -- page 25. S...
by SteveBagley
Wed Sep 04, 2013 5:19 pm
Forum: Hardware
Topic: [PICS] Installing a Marpet XTRA Ram 8 in Mega ST
Replies: 20
Views: 3204

Re: [PICS] Installing a Marpet XTRA Ram 8 in Mega ST

busybee wrote:
alexh wrote:
busybee wrote:Could that also be installed on a Mega STE?
No. This connects to the MegaBus header which the MegaSTe doesn't have (it has VME instead).
Were any memory expansion boards ever made for the Mega STE?
I seem to remember there was a version of the XtraRAM +8 for the STe and MegaSTe as well.

Steve

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