Search found 497 matches
- Sun May 12, 2019 5:48 pm
- Forum: 680x0
- Topic: Digisound via PSG
- Replies: 8
- Views: 501
Re: Digisound via PSG
try turn of the mixer so no sound is set to on Thanks, already did that as it is done in the GEMJing sources, too. Checked my demo on a MSTE with SM124 and I have to say that the sound via the SM124 own speaker sounds better than via the speakers I have attached to my PC when playing the same demo ...
- Sun May 12, 2019 5:20 pm
- Forum: 680x0
- Topic: Digisound via PSG
- Replies: 8
- Views: 501
Re: Digisound via PSG
so your loop is wrong depend on you conversions list it should be more like this Not "my" loop. So I was not mistaken that the published code cannot run. Anyway, thanks to arf and the GEMJing sources I've been able to make the code run. Bad noisy quality anyway :( Thought it would be bett...
- Sun May 12, 2019 1:47 pm
- Forum: 680x0
- Topic: Digisound via PSG
- Replies: 8
- Views: 501
Re: Digisound via PSG
Thanks, I will have a thorough look into the SAMROUT sources as they look clean and neat. About the USP: I always thought that only one SP (USP or SSP) is accessible by the programmer 8O Anyway: I expected some address wrap-around in hardware and the move.l should really be a movep. Changed that but...
- Sun May 12, 2019 10:08 am
- Forum: 680x0
- Topic: Digisound via PSG
- Replies: 8
- Views: 501
Digisound via PSG
Hi Folks, trying to implement a Digisound function in ASM/Pure C for the PSG. I searched the forum and found this http://www.atari-forum.com/viewtopic.php?f=16&t=16152&p=141914 thread. unseenmenace attached a ZIP with a small ASM routine that I am trying to implement. By now I just got noise...
- Fri May 03, 2019 11:37 am
- Forum: Coding
- Topic: TT & DMA Sound
- Replies: 5
- Views: 455
Re: TT & DMA Sound
If it was that easy I would not have asked. 
(Source: Atari Compendium pg.5-19)
(Source: Atari Compendium pg.5-19)
- Fri May 03, 2019 9:05 am
- Forum: Coding
- Topic: TT & DMA Sound
- Replies: 5
- Views: 455
TT & DMA Sound
I'm playing around with STE DMA Sound for the first time i.e. creating a simple lib for playback. If I understand DMA Sound correctly then the playback buffer has to be located in the first 4MB of ST memory. But how can I achieve that on a TT? AFAIK DMA Sound on TTs is limited by the 4MB barrier, to...
- Mon Feb 25, 2019 8:41 am
- Forum: Hardware
- Topic: Atari 520 STE memory problem
- Replies: 34
- Views: 3087
Re: Atrai 520 ste memory problem
spiny wrote:Has the onboard RAM been disabled ?
LOL
YMMDHave you read the headline?
- Sat Feb 16, 2019 8:43 am
- Forum: Hardware
- Topic: Dead MegaST
- Replies: 11
- Views: 1470
Re: Dead MegaST
So I got it running to some point. With test-kit it performs: R - RAM: OK D - DMA: OK T - Timing: OK S - Serial: OK M - MIDI: OK F - Floppy: Quick Test: OK F - Floppy: Extensive test: fail F6 Read compare error 0200 4200 Track 00 Sector 10 F6 Read compare error 0300 4300 Track 00 Sector 10 F6 Read c...
- Sat Feb 09, 2019 8:03 am
- Forum: Hardware
- Topic: I just bought an Atari Mega ST4 with hard drive in it!
- Replies: 28
- Views: 2856
Re: I just bought an Atari Mega ST4 with hard drive in it!
rcamp48 wrote:Question:If I remove the Viking card will I looses Ram ? Or is the ram on that card used for video?
Of course it's used as screen memory. If you need drivers you can get them from my downloads section.
- Thu Feb 07, 2019 7:40 pm
- Forum: Hardware
- Topic: Need help to reproduce the Mega Mix 4 hardware
- Replies: 3
- Views: 528
Re: Need help to reproduce the Mega Mix 4 hardware
This interface is used to connect up to four MegaST/STE or TT keyboards to a MegaST/STE/ or TT?
How are the inputs mapped onto the output? Via mechanical switch?
If so then you may think about using multiplexers like 74HCT157.
How are the inputs mapped onto the output? Via mechanical switch?
If so then you may think about using multiplexers like 74HCT157.
- Thu Feb 07, 2019 10:24 am
- Forum: Hardware
- Topic: Atari ST MMU
- Replies: 4
- Views: 758
Re: Atari ST MMU
TeX38 wrote:When there is a problem with an ST, does the CAS signal get stopped or have I got a faulty MMU? (C025912)
No /CAS on upper or lower bank? Just verified it and I see that there is /RAS activity at boot time on the upper bank but no /CAS activity. On lower bank /RAS and /CAS are active.
- Mon Feb 04, 2019 5:28 pm
- Forum: Hardware
- Topic: Pro VME Hypercache 030
- Replies: 14
- Views: 1658
Re: Pro VME Hypercache 030
dhedberg wrote:Would be interesting to see some benchmarks
http://www.stcarchiv.de/stc1992/03/turbo-boards-atari-st
http://www.stcarchiv.de/stm1990/10/hypercache-030
- Mon Feb 04, 2019 5:03 pm
- Forum: Hardware
- Topic: Pro VME Hypercache 030
- Replies: 14
- Views: 1658
Re: Pro VME Hypercache 030
Did a little sketch. https://i.ibb.co/Ph7QLkX/TagRAM.gif Cacheable area: 4MB Cache size: 64KB Given that the DataSRAM (not on sketch) is 64KByte in size A[15..2] are connected to the address pins of the SRAM used for storing the Tag. So A[21..16] form up the Tag that needs to be stored/read. So thes...
- Mon Feb 04, 2019 4:21 pm
- Forum: Hardware
- Topic: Pro VME Hypercache 030
- Replies: 14
- Views: 1658
Re: Pro VME Hypercache 030
Heh :) Saves me typing out an explanation of how it works using just static RAM (at the expenses of a few wait states) Steve I'd read it with delight. Always eager to learn something new :D If someone with this accelerator looks for drivers: I have put a ZIP into the Downloads section of my homepage.
- Mon Feb 04, 2019 3:02 pm
- Forum: Hardware
- Topic: Pro VME Hypercache 030
- Replies: 14
- Views: 1658
Re: Pro VME Hypercache 030
Case closed. I should have checked more thoroughly 
Beneath three of the four ROM sockets are three MK41H80 Tag RAMs.
Beneath three of the four ROM sockets are three MK41H80 Tag RAMs.
- Mon Feb 04, 2019 2:43 pm
- Forum: Hardware
- Topic: Pro VME Hypercache 030
- Replies: 14
- Views: 1658
Re: Pro VME Hypercache 030
Some side notes. I thought that the Hypercache 030 boots into KAOS but seems to contain a patched 1.04 The bootscreen is pretty interesting as it contains the address of the Bavarian Broadcasting in Munich! https://i.ibb.co/dWxCJpP/IMG-0719.jpg Desktop info gives this: https://i.ibb.co/z7dmFpx/IMG-0...
- Mon Feb 04, 2019 1:10 pm
- Forum: Hardware
- Topic: Pro VME Hypercache 030
- Replies: 14
- Views: 1658
Re: Pro VME Hypercache 030
Thanks for the explanation on Tag. But I know that already! I dug into the Mach16 schematic and IDT datasheet some years ago. Besides I've studied Computer science. Anyway: I looked into the topic of creating a TagRAM with standard Static RAM and external logic two years ago. Problem is that IMO man...
- Mon Feb 04, 2019 10:00 am
- Forum: Hardware
- Topic: Pro VME Hypercache 030
- Replies: 14
- Views: 1658
Re: Pro VME Hypercache 030
I found the accelerator card in one of my drawers these days. Anybody able to answer my questions? There are 10 74HCT573 latches between the 68000 and the FPU socket and 8 MCM6168P55 (4K x 4 55ns SRAMs to my knowledge) between TOS EPROMs and CPU/FPU. The ICs with stickers are 16V8/22V10.
- Sun Feb 03, 2019 8:02 pm
- Forum: Hardware
- Topic: Dead MegaST
- Replies: 11
- Views: 1470
Re: Dead MegaST
So I am narrowing down the source of the CLK8 problem - at least I think so. I have reworked the CLK8 generated by MMU so that I totally ignore its CLK8 and use CLK16 to feed at frequency divider (74F74) and use its output as the new CLK8. Gives me a nice clock with 4V at its highest and only 200mV ...
- Fri Feb 01, 2019 6:37 pm
- Forum: Hardware
- Topic: Dead MegaST
- Replies: 11
- Views: 1470
Re: Dead MegaST
As I said the CLK8 generated by MMU didn't look like what I expected. This is it: https://i.ibb.co/vBfznL3/ClockOrg.gif I had the feeling that I should rework the CLK8 so I put a 74F32 on top of the 74LS11 next to MMU and wired it like this: https://i.ibb.co/xgwWsqZ/Schematic.gif R113 is the origina...
- Fri Feb 01, 2019 9:53 am
- Forum: Hardware
- Topic: Dead MegaST
- Replies: 11
- Views: 1470
Re: Dead MegaST
Back in business - repaired the CLK8. It still won't go down to 0V. Lowest peak I see on the scope is around 600mV. Usually clocks on the Ataris I saw so far undershoot GND by >1V. Will check it on a 1040 later. I see the /HALT signal come and go. /RESET is high. When pushing the Reset button both g...
- Wed Jan 30, 2019 9:39 pm
- Forum: Hardware
- Topic: Dead MegaST
- Replies: 11
- Views: 1470
Re: Dead MegaST
Everytime I touch the board it's getting worse.
Now I don't have a CLK8 anymore - it's constantly high. CLK4 is constantly low. CLK16 into MMU OTOH is fine. I put the MMU into a 1040 and the system boots properly...
Now I don't have a CLK8 anymore - it's constantly high. CLK4 is constantly low. CLK16 into MMU OTOH is fine. I put the MMU into a 1040 and the system boots properly...
- Wed Jan 30, 2019 9:06 pm
- Forum: Hardware
- Topic: Dead MegaST
- Replies: 11
- Views: 1470
Re: Dead MegaST
CLK8 looks fine just doesn't reach 0V
GND/Vcc on CPU is at 4.9V
GND/Vcc on CPU is at 4.9V
- Wed Jan 30, 2019 8:41 pm
- Forum: Hardware
- Topic: Dead MegaST
- Replies: 11
- Views: 1470
Re: Dead MegaST
Thanks for the suggestions. I moved the board to inspect the bottom side and since I pressed the PSG into its socket I cannot recreate the scenario again :-/ The system behaves now without any signal change on any signal at all, except /HALT and /RESET when pressing the Reset button. /BERR is consta...
- Wed Jan 30, 2019 4:24 pm
- Forum: Hardware
- Topic: Dead MegaST
- Replies: 11
- Views: 1470
Dead MegaST
Hi Folks, I got this MST with strange behavior. It won't boot at all and cycles through the same "signal loop" i.e. every 8µs (= 64 CLK8) it shows the same picture on the scope: https://i.ibb.co/3yFhNfG/DS1104-Z-20190130-171134.gif I checked other signals (with the pink colored probe) whic...