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tf_hh

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About tf_hh

  • Rank
    Dragonstomper
  • Birthday 10/11/1970

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  • Gender
    Male
  • Location
    Germany
  • Interests
    Microelectronics, Atari 8-Bit Hardware, Atari 16-Bit Hardware, ATMEL Microprocessors

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  1. When you say it so, it´s a self-fulfilling prophecy 🙂 A stock 800XL draws around 800 mA, a stock XE around 700 mA. But with a some expansions you can easily exceed above 1A. The most genuine Atari power supplies offers up to 1.5A. So when talking about a modern power supply, I think 2A is a good choice. IMHO it´s better not to take the cheapest chinese availible. Since several years I buy the Raspberry Pi Foundation branded power supplies for use with Atari 8 bit stuff. You can get the 2.5A version for RPIs less then V4 for 10-12 EUR / USD. Until today no outage with one of them. Even when they look like all the other, I have a better feeling. Maybe only self-deception
  2. Under normal conditions this isn´t possible. All highspeed charging power supplies (cellphones, tablets) initiate a special protocol before highspeed mode (higher voltages and more amps) is activated. If the protocol doesn´t be taken, the power supply switches to compatible mode - 5 volts, 2 amps max. I´ve tested Huawei and Samsung highspeed charge power supplies with the XL... works fine 🙂
  3. SysCheck _can_ substitute the complete 64 KByte main memory, but internal Atari Basic and any inserted cartridge is disabled then. The reason is simple: When SysCheck forces control over the buss to mirror the memory on the SysCheck PCB, the logic can´t recognize what´s plugged into the cartridge slot.
  4. I´m sure the shipment was on a very slow boat... 😆
  5. When I open my cable from Lotharek, I also mention there was no shielding. But, I shorten the cable to 40 cm lenght, because I use S-Video to HDMI converters. This short lengths works for me without quality problems, but it´s not as it should be, nevermind. From my personal experiences, only older CRT TV´s are capable of displaying S-Video signals using SCART. S-Video over SCART is a very very late addendum to the SCART specification and not all televisions accept it. I didn´t know about any common computer monitor with SCART which is capable using S-Video.
  6. After all - as already said here some times - the cables aren´t shielded. You didn´t get what you paid for. 2nd... the experiences of picture quality depends massively on the personal environment. If you have a WLAN access point and/or a DECT wireless phone sender and/or Bluetooth senders in the near of the Atari and it´s cables, it might force disturbations somehow. If your Atari isn´t fully shielded anymore and your cellphone is near to this computer, or one of the EMI sources above, the effects can be surprisingly. After all: Making video cables where at least no shielding overall is present is gambling, nothing more, nothing less.
  7. Might sounds strange, but I`M HAPPY TO READ THIS! I´ve ordered two cables several months ago, and both cables make the same problem. I found the reason why: The "Chroma" pin of the S-Video plug isn´t connected to Pin 5 or the DIN 5 plug (which contains "C" - Chroma - at all XEs, the XLF and modded XLs), it´s connected to pin 4 - CVBS. So you get all the ugly disturbations of a combined (CVBS) signal also to S-Video, what is nonsense, than this is the one and only goal of S-Video: having different signals to get better color quality. I wrote this to Lotharek, he said he checked the cables in stock and they´re ok. Because normally I trust him absolutely, I take this as it is, cut the glued DIN 5 plug and make my own. Since this the S-Video quality is okay. But reading this thread here shows me, I´m not the only one...
  8. The mini amplifier on the SCCC supports only Mono, so better don´t use it. Please short-circuit all three terminals at the SCCC audio input to prevent the amplifier from floating. Regarding POKEY-Max it´s the best way to use a 2nd cable. Such things with usage of pre-defined pins, specially used for power supply, is never a good idea and can end up in destruction of parts. At one time you don´t remember it, plug the wrong cable or adapter and.... 50-100 USD blown away. So don´t do this, the 400 has enough possibilities to outbreak a 2nd cable without the need for drilling the case etc., only a drill in the metal cage, but this is absolute no problem at all.
  9. Yes, QMEG also enables the Speedy series to use Highspeed SIO. As the QMEG programmer is a German and the Speedy comes from a former German company, this combination is found very often here and works fine together 🙂
  10. IMHO this is a hoax. These boards are offered as "Atari SFP004" retail boxes widely availible in Germany during the high-time of the ST era. The most purchasers were universities and mathematical facilities. Only a few program packages (applications) supports this boards, mostly in scientific based areas. At the end of the 90s somebody purchased the last big warehouse in The Netherlands from former Atari Europe Central. Hundreds of this cards were offered at eBay for 1-2 years, like new SF-354 drives and other stuff.
  11. Which ST? Mainboard version? Some STs have problems with the electrolytic capacitors located in the audio output path (22 uF each). After exchanging them (only a few cents item) the volume and loud again.
  12. I´m sure a lot of people here at AtariAge will prove that I´m absolute standing behind the word "service" and until today I found for every problem a solution - from U.S. to Australia, New Zealand, Japan or wherever. So if you are interested and purchase one of them and it will NOT work, I will help. Or refund. Or whatever is the best way for both sides 🙂
  13. In general I also recommend to remove the existing DRAM. Most important reason is the fact, that the 32 DRAM chips (1 MByte) draws a lot of current, make the machine more warm than needed and, 2nd reason, in absolute rare cases it might cause trouble. Not only with my expansion, will all - that´s why some manuals demands the removal of the old RAMs. IMHO it´s not mandatory at all. You have only to cut the connection from CASxL, CASHxH and RASx (x = 0 or 1, banknumber) and connect these three lines directly to high level. This forces the RAMs to be in tri-state and deactivated. 99% of all machines works fine then.
  14. The main problem of the most accelerator boards is a dirty implementation of the cache hit/miss logic. For example, some early PAK versions won´t also run with TOS 2.0x, because their initial logic didn´t recognize the TOS 2.0x memory area ($E0000-$E3FFFF). I have only "HyperCache ST" from proVME (16 MHz with 16 KByte cache) boards for the ST series. They work in 2 different Mega ST and works fine with my and other TOS 2.0x solution. IMHO these proVME ones were the only one really 100% working accelerators (can speak for the german market only). Some other accelerators like the HBS240 and other have nasty, hard to catch problems. In some conditions they work flawless, in other environments (specially MIDI equipment with their dongles) spurious problems occours. Can understand, the power of a BBS with 8 MHz standard isn´t a pleasure. That´s why I wrote a lot of parts in my BBS software ("Madness Mailbox-System") in pure assembler
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