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re-atari

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About re-atari

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  1. Hi Lenore, I haven't logged in for quite a while, so missed this question. Sadly I haven't been able to find a ROM dump. I did contact Richard2112 by PM or email, but IIRC he never got back to me. Maybe my mail got lost somewhere along the way. Workrelated requirements got in the way shortly afterwards, and I never got back to the subject later on. re-atari
  2. I guess it's slightly off-topic, but there's an interview on Youtube with Dona Bailey, Centipede's original creator/programmer. Check it out at: re-atari
  3. You do how the black tulip mania ended, don't you? The crowd madness all of sudden collapsed completely overnight without any specific reason, prices of tulip bulbs plummeting to only a fraction of what they were before. It caused a lot of people to lose lots of money or even go bankrupt. I'd call it the first documented pyramid scheme (or scam) in history, caused by speculation fuelled by greed of the 'not so initiated' in the trade. Something similar has happened with another hobby of mine, collecting (Marklin) model trains, which I've been doing since the 1970's. About 20 years ago model trains were discovered as a good way of investment, with predictable consequenses for the 'esteemed value' of items. Right up to pure speculation with certain models built in the 50's and 60's (like the CCS800 Crocodile locomotive). The last couple of years common sense has gradually sunk in along with (or maybe because of) a flood of collections for sale, eg. after a collector's death, and the investment hype quickly faded away. Because of this prices have been falling ever since, especially so with the models that were once regarded as a good investment item. Personally I have never really cared about the value of my model train collection, just enjoy the beauty of watching them on display in the cabinet on the wall. Never felt the urge to get carried away in the investment hype, and pay overinflated prices for specific items just for the sake of owning them, either. Value is just a matter of perception and a result of your own definition. The 1200XL madness will probably fall through as well. Until then, if you don't think the items on eBay are worth the asking price, just ignore the gold digger sellers and let it pass. re-atari
  4. Good grief, how could I have missed this Good mockup of the humble A8 with 'true' office ICT equipment, btw. In my defence, it's been ages since I last visited Curt's website and my memory is getting a bit rusty with age. Amazing that a magazine that IIRC never did an article about the Atari 8-bits used this very image. Better late than never, I guess. It didn't mention a source for the image, but I'm sure that they will have received permission to use it. re-atari
  5. It does bring back memories about how things went in the olden days. IMHO perfectly captured in Arcade Fire's 'We Used To Wait'. I remember subscribing to Analog Computing around '86 or '87, and as I'm EU based had to resort to sending international money orders for payment. No guarantee they would arrive, and not disappear or fall in the wrong hands. Would have been costly, as due to very high exchange rates at that time and shipping the nominal subscription cost multiplied by 4! Thankfully Analog had a good subscriber support, and every payment went fine. They were genuinely good people to deal with, not anything like the so-called service centra we have to cope with these days. re-atari
  6. Last weekend I received my latest copy of the German magazine 'C'T - Magazin fuer Computertechnik', and noticed that one of its articles was illustrated with the photo atached below. Notice the Atari 800 in the middle? But I've never seen the other stuff, like an Atari 8000, a line printer, a teletype and an open reel tape backup. It looks like a central micro system of some sorts for offices. I've been this mag's subscriber since early 1988 and have never seen it publish an article about or for the Atari 8-bits. They might have earlier on, though. I don't know where this image originates. It looks quite ancient, fuzzily painted in aquarel style as was fashionable in the early 80's, and then photoshopped inside a 100 Euro banknote. Does anybody recognize the equipment? The article itself has nothing to do with Atari, btw, as it deals with the possibilities to receive tax deduction when you have a small business office in your own home. Some more detailed info about the article: it's named 'Heimbürogemeinschaft - Gemeinsam genutztes Arbeitszimmer steuerlich geltend machen', c't 12/2017, page 156-158, written by Martin Weigel and Peter Schmitz. re-atari
  7. I came across an assembly listing on the Atari Wiki intended to make a custom disk format routine using command F on a 1050 with Speedy enhancement. Although not a direct link with this thread's subject (disk sector interleaves), the article might be an interesting read nevertheless. Check out: https://atariwiki.org/wiki/Wiki.jsp?page=Custom%20Disk%20Format%20Routine re-atari
  8. I'm only familiar with PAL Antic variants, C014887 (rev. D) and C021698 (rev. E). C014887 features a 7-bit DRAM refresh, which can max. address 4164 DRAMs (128 rows). With this one a 256Kb memory expansion using 41256's requires added circuitry to provide the needed 8th refresh bit. C021698 (later type) has 8-bit refresh built in. My guess is that this version was designed to give flexibility in the choice which DRAMs to build in. The cheaper (and these days infamous) Micron MT4164's needed a 8-bit refresh (256 rows). IIRC something similar is going on with the NTSC Antic variants (C021696 and C021697). Probably not the answer to your question, and I think you already were aware of this info re-atari
  9. There is a hardware way to divide the 16Kb address space on a 27128 into 2 8Kb blocks and select between one of these 2 blocks using a switch. Connect pin 26 (address line A13) via a 4k7 resistor to +5V (pin 28) and via a switch to GND (pin 14). Open switch means the high 8Kb block is selected, closed switch the low 8Kb block. It sounds like TS programmed the eprom with the 8Kb bin file into address x0000-01FFF, leaving the upper 8kB block empty. As you say, programming the bin file in both 8Kb blocks will solve the problem. Using a pincompatible flashrom or eeprom will save the tedious and time consuming UV erase process. Of course, the programmer will need to support those. Don't know if this particular one does. A 27256 eprom is not entirely pincompatible with a 2764 like a 27128 is. On a 2764/27128 the /PGM signal is on pin 27, this is routed together with /CE to pin 20 on a 27256. The manufacturers needed to make a pin available for A14. The only difference between a 2764 and a 27128 is pin 26. On the 2764 this is NC, where on the 27128 it has the extra address line (A13) needed for 16Kb. Note that all 27128's require a 12,5V programming voltage, where some 2764's need 21V. Usually this is clearly stated on top of the eprom. re-atari
  10. I think you'd have to blame Commodore for this. Back in the 80's friends with a C64 told me similar horror stories, like you should only plug in a joystick when the computer is switched off. Otherwise you'd probably blow a (not socketed) VIA. Clearly a design flaw, as it would only require a few diodes to protect the IC from this kind of damage. re-atari
  11. I agree with you, Paul. Especially with XE boards you simply cannot be too careful, the traces on these are so easily damaged. I fear 18W might be a bit underpowered for soldering/desoldering +5V or GND planes, though. Usually these are quite large surfaces that quickly drain the heat from your soldering tip, an 18W iron might not be able to keep up with the pace and maintain the required temperature. That's when lifting a trace becomes a real threat. In my experience, the shorter you need to heat up a soldering joint, the safer. I have used a JBC 24W soldering iron for the last 25 years, just a standard type, no temp. control or anything fancy. IIRC it's a Spanish brand. This one has served me well all this time, it even still has the original tip! They don't make 'em like this no more. Having said that, lately I have been looking around for a more advanced replacement, one with temp. control and removable tips. I have heared very positive reviews about Bakon 950D soldering stations. These are available on numerous shops on AliExpress for about GBP 30 (or US$ 40). I have been constantly postponing my order, though, as the JBC iron is still going strong, so no personal experience with this one yet. re-atari
  12. I agree this looks like a homebrew casing that just got a Atari label slammed on. The labels aren't even outlined properly, look at the nametag. Seems to be a peripheral for the ST line containing a SCSI to ST512 interface by Berkeley Microsystems. It might very well be a homebrew project by a former Atari employee, that would be in line with the seller's description. Someone wrote a question in the eBay listing, stating it might be a Transputer. Which it definitely is not, I remember seeing photo's of a Atari T800 board and casing in a German computer magazine early 1988. This casing and board don't look anything like it. Do check out the other items the seller has on offer. For those interested he has a BIT3 80-column card for the 800 for sale. Buy-direct price is a bit steep though, at US$ 150. Which is more or less in line with his asking prices for the other items, like a 3,5" Teac floppy drive at 'only' US$ 25. re-atari
  13. The seller provided a link (http://atariage.com/forums/topic/186285-atari-815-whats-inside/#) in the description of his eBay listing, which leads to AA (where else?). Judging by Fibrewire's photo's in that thread, there are quite a few Atari specific IC's (CO-nrs.) on the PCB. I haven't looked up the CO nrs. to check what IC's they are, but good luck getting a replacement if any of these is defective. And hopefully there are no PAL's or PROM's on board. In this thread http://atariage.com/forums/topic/78379-atari-815-controller-source/# Curt Vendel posted the source of the 2 eproms, in post 15 Bob Wooley posted a photo of the PCB component side. The final post states there should be schematics available, but sadly they appear to be MIA. From the description by the seller it looks like he will go about the deal reliably and responsibly, your everyday eBay seller would not even care to mention the missing parts and defects, or make statements about packaging and shipping. That said, no matter how rare 815's are, I really can't jusitfy shelling out that kind of money for an untested unit that is sold 'as-is'. Besides that, I'm not in the US, so no shipping. re-atari
  14. I built that one on perfboard back in '86. Note that there are 2 versions of the SP0256 IC, one outputs phonemes, the other allophones. This design needs the allophone one. 3 guesses how I found out... The Page6 article didn't list the complete IC name, it should have read SP0256-AL2. My electronics shop supplied me with the phoneme one (SP0256-PH2). That one just gave out gibberish. Luckily I could return the (very expensive!) IC and got my money back. The shop said they never received the IC I needed. After a few months I just cannibalized the perfboard. I think I used the board to build a modem based on a AMD7910 IC. re-atari
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