Search found 184 matches

by SteveBagley
Tue Jan 06, 2015 12:38 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

I can knock up a small STOS program to output the values of those counters if someone knows exactly what addresses to poke at. I assume I can poke at the video start address in RAM. At least we can check if that value is correct. There's two sets of registers: $ffff8201, and $ffff8203 are the video...
by SteveBagley
Tue Jan 06, 2015 12:20 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

My initial thought is to just tie DE to the 16mhz/32mhz switch. So when GLUE wants to increase the counters in the MMU, it does it all back at default speeds. There might be other issues with clocking the MMU at double speed while loading the shifter registers, but that can probably be downclocked ...
by SteveBagley
Tue Jan 06, 2015 10:30 am
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

Really its just a matter of finding some signals so that when MMU is talking to shifter, it must switch back to 16mhz input to the MMU. So far we should assume that when GLUE set DE HI, that MMU must run in 16mhz input. Maybe even monitor DE on GLUE. We just need to know some way to determine what ...
by SteveBagley
Sat Jan 03, 2015 11:22 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

Small progress. I removed the 6 EPROM KAOS and put in another TOS 2.06/IDE card (DIY project from German magazine c't). With the P16 CPU and 16MHz and with the Motorola P8 CPU at 8MHz I get this picture: http://www11.pic-upload.de/thumb/03.01.15/5yli4ldh2b.jpg With a EF68000P8 (stamp on top is "854...
by SteveBagley
Sat Jan 03, 2015 11:17 pm
Forum: Hardware
Topic: STe bad DMA chip...all of them are bad?
Replies: 15
Views: 2811

Re: STe bad DMA chip...all of them are bad?

One easy question...I suppose. I have an STe that has the "bad" -38 DMA chip...but it seems it works OK with the Ultrasatan. Is this bad issue with this chip random? or is it used to fail on the first attemp? I mean...is it safe to work with this STe or should I do Exxos's mod or replace the chip b...
by SteveBagley
Thu Jan 01, 2015 3:53 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

I thought GLUE was controlling DE to MMU/Shifter ? If MMU is driving DE to shifter then that would make more sense. Though I thought GLUE drove DE, so nothing would change sync or clock wise if GLUE was still being clocked at the default 8mhz. If MMU is driving DE, then as MMU is double clocked, th...
by SteveBagley
Thu Jan 01, 2015 3:17 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

As I understand the meaning of the DE line Glue tells MMU to stop any RAM access by DMA/CPU and let the Shifter get the data to be displayed. DE is simpler iirc, it just tells the MMU when to start passing data to the shifter -- the old overscan mods just change the period of this to extend the dis...
by SteveBagley
Thu Jan 01, 2015 2:21 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

Also it seems to be running the CPU at 16mhz all the time, we never got that to work, there was some talk about it a few weeks back in this thread. Unless the issues were just with CPU <>MMU issues. If both are running at double speed then it could be possible the CPU could run 16mhz all the time. ...
by SteveBagley
Mon Dec 22, 2014 7:18 pm
Forum: Hardware
Topic: Stacy/Mega STE SCSI host adapter
Replies: 11
Views: 2251

Re: Stacy/Mega STE SCSI host adapter

joska wrote:
SteveBagley wrote:I get a 404 (see attached screenshot)…
That's strange... The file is there and the URL definitely works. And there is no error logged on the server. I don't know what's going on.
I get the same problem using curl from my server at linode too…

Steve
by SteveBagley
Mon Dec 22, 2014 6:31 pm
Forum: Hardware
Topic: Stacy/Mega STE SCSI host adapter
Replies: 11
Views: 2251

Re: Stacy/Mega STE SCSI host adapter

I get a 404 (see attached screenshot)…

Steve
by SteveBagley
Mon Dec 22, 2014 6:19 pm
Forum: Hardware
Topic: Stacy/Mega STE SCSI host adapter
Replies: 11
Views: 2251

Re: Stacy/Mega STE SCSI host adapter

joska wrote:I have used one of these in an external harddisk for my Mega, and also modified it to work with drives that requires parity generation. Here's my notes from the "build".
The link appears to be broken

Steve
by SteveBagley
Fri Dec 12, 2014 5:13 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

This may shed some light on the issue: http://pasti.fxatari.com/68kdocs/AtariS ... nting.html

Steve
by SteveBagley
Tue Dec 09, 2014 9:38 am
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

I think the mc6809e qustions are perfectly valid. The 68000 BUS is asynchronous and thus CPU should allways wait for the DTACK signal. Also I hink the clock E should be allways divided to the correct value identical to the 8MHz device. It's not DTACK per se that is the problem, but AS. Having read ...
by SteveBagley
Sun Dec 07, 2014 4:58 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

Yea I spotted that last night… I suspect these are work in progress versions because I saw a few other typos (I doubt it would compile since there is no A32 pin defined for that chip :-)) Steve Yeah, probably wasn't final versions, at least I hope not ;) Though I am wondering about just replacing s...
by SteveBagley
Sun Dec 07, 2014 1:59 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

Rodolphe found a bug in the PAL code... CAV = A23 * A22 * /A21 + A23 * A21 * A20 + A32 * /A22 * A21 Wondering if that error went into production machines ?? Thanks for people who reporting back tome that their boosters are working :) I am wondering if I setup a new section on my site, if people wou...
by SteveBagley
Sat Dec 06, 2014 9:02 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

For one you need TAG RAM which seems hard to find, but even so, the code involved for cache hits and misses looks pretty complex. Where did you find the GAL code ? They were on the Atari HQ iso that is floating about the net (hiding under /Documents/Atari/TECHDOCS/MSTE/PALS -- along with all sorts ...
by SteveBagley
Fri Dec 05, 2014 5:36 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 721
Views: 142023

Re: 4MB Upgrade & 16MHz Booster progress

Yeah it looks that way. Cache isn't a easy thing to add unfortunately. Its why ultimately I want to speed up ST RAM instead. We really need a new version of the MMU, but can use SRAM instead. I'm interested in the reasons why you consider cache hard to add, because I'd have thought it somewhat simp...
by SteveBagley
Sat Nov 29, 2014 12:15 am
Forum: 680x0
Topic: Looking for pieces of asm source code suitable for beginner
Replies: 7
Views: 5290

Re: Looking for pieces of asm source code suitable for begin

There's the Bullfrog tutorials that appeared in ST Format which might be worth a look…

Steve
by SteveBagley
Tue Nov 11, 2014 10:16 am
Forum: Professionals
Topic: Falcon Problem (Solved)
Replies: 64
Views: 11525

Re: Falcon Problem

What do the GAL's do on the falcon ? maybe one of those is faulty ? One thing is clear though, the 060 can access the entire falcon bus and it works. So as the 030 can't, maybe the 030 is faulty ? Also I assume the TOS ROM's you used are fast enough ? The [PG]ALs convert the 030 bus back to a 68000...
by SteveBagley
Thu Oct 30, 2014 12:03 am
Forum: Hardware
Topic: 020 Cloned
Replies: 3
Views: 905

Re: 020 Cloned

Dal wrote:Very interesting. I guess there must still be a lot of legacy equipment using 020s for them to justify the R&D for this.
The Eurofighter for one!

Steve
by SteveBagley
Mon Oct 13, 2014 9:47 pm
Forum: Hardware
Topic: St-fm cpu overclock
Replies: 422
Views: 61477

Re: St-fm cpu overclock

Presumably it would be very easy to do a TOS2.06 Fast ROM option since GLUE won't decode DTACK for the $E00000-$EFFFFF range? It's only the older TOS <= 1.4 that would have an issue.

Steve
by SteveBagley
Mon Sep 15, 2014 3:12 pm
Forum: 680x0
Topic: Bad Mood : Falcon030 'Doom'
Replies: 2353
Views: 374503

Re: Bad Mood : Falcon030 'Doom'

I thought this news article might amuse the people reading this thread :-) Someone's ported Doom to a printer. :-)

Steve
by SteveBagley
Fri Aug 01, 2014 10:57 pm
Forum: Hardware
Topic: The LaST Upgrade - Part 15 - Bad DMA "fix"
Replies: 14
Views: 5272

Re: The LaST Upgrade - Part 15 - Bad DMA "fix"

Maybe somewhere here who has used the ICD link cables or equivalent can shed some light on if they behave on the STFM and STE machines and what DMA chip is being used... I did have a DMA cable, 2 or 3 in fact years ago, but I do not remember ever having any problems with them, but the chip used cou...
by SteveBagley
Mon Jul 21, 2014 1:03 pm
Forum: 680x0
Topic: Bad Mood : Falcon030 'Doom'
Replies: 2353
Views: 374503

Re: Bad Mood : Falcon030 'Doom'

Using Markov chains and letter n-grams, per chance? Well deduced, yes. Synthesis used turbulence based on a location seed, so you just had to query the name of a place with its coordinates, to find out what it had called itself. Much of the rest of the system worked that way too. Clever ;) We had a...
by SteveBagley
Mon Jul 21, 2014 12:41 pm
Forum: 680x0
Topic: Bad Mood : Falcon030 'Doom'
Replies: 2353
Views: 374503

Re: Bad Mood : Falcon030 'Doom'

the starchart was interesting because it used a nice algorithm which 'learned' how to fabricate names using a list of samples, and could produce a myriad of stable procedural names with a similar flavour, for all the stars on the chart. You could feed it a list of Italian village names and it would...

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