candle

if drive won't seek, even at power cycle when condition occour, then i would suspect riot chip - this one is responsible for driving seek motor (don't know how could i name it - it is the one responsible for moving the head on another track) and have half of memory 1050 has (128 bytes that is) also - check if head moves freely when drive is disconnected from power supply, check if it won't get stuck on some position - you may claen and lubricate guide bar and its bearigns, but i would not disassembly the mechanism if you have no experience with this hope it is understadable for you

i would really apreciate, if someone speaking nativly english could check this and gave me his opinion there are schematics and current pcb layout for simplestereo project provided for reference and verification - rev 1 had some issues that were adressed in this revisiosn i've spent whole day preparing this, and now am pretty tyred, so some cross-checking before it hits production stage would be great board dimensions are 2230x1740 mils, board height (measured from main pcb) is 380mils - i hope it will fit in any system

mkay, understood, though that those bigger cpld devices have some jtag port for programming (thus no need to program them in programmer) back to the topic, could someone send me some high-res photos of 1200xl board, done from top (top of enclosure and keyboard removed) - that way i could take this into consideration when doing other extensions

i just hope you're not using plcc are you? you can use 84 pin plcc as fan

casinh is sufficient for 1mb to work, adding few equations to generate 2 additional chip select signals shouldnt be a problem, unless you're really short on pins can i assume that if you using atmel cpld you're writing your equations in wincupl?

casinh perhaps? are you doing 14mhz version then? have you considered altera cpld devices with pin to pin delay of 2ns? there are also 10-12ns memory devices at the same prices than 55ns ones, with diffrent pinout though

resolution of atmega is now limited by software, at 20mhz it can do 56 chars, it should do 80 at 28

sl0re: i've dropped a message on Polish board about this matter (lending, giving me a xl machine) will see - probably noone will respond, but at least i'll try i don't need workingg machine, just one that would be complete, so any design pitfals (space, shape considerations) could be seen Bob, is extsel provided in 1200xl? if so 1mb upgrade should work and chips should be fast enought to keep up with Your boardd

Bob, 1mb schematics would be almost pin to pin map from SRAM to ROM chip, true logic is in GAL, if you need cupl file i could send it to You i don't know if 1200xl has basic at all, but XEGS doesn't have basic chip per se, and this wasn't really a problem with XEGS upgrade, just diffrent gal used, as since it has no extended memory controller chip either, ext mmu and mmu were combined into one device - gal22v10 was used for this sl0re: i know one person, but it would arrive in summer tthat way - not too rapiddly i think

Pajero board is certainly XE compatible, since those line was most popular one in Poland, and every possible extension made recently in Poland is XE compatible i would love to check if mine is XL compatible, but i don't have any XL for testing, nor for board shape/dimension consideration and planning just XE and XEGS, but i'm working on it... if board will fit into XL machine (especially 1200XL) then memory upgrade should be compatible with Bob Wooley's (hope to get that name right) turbo board, since it uses same or almost the same memory chips (55ns 512kbytes of SRAM per chip) hope someone will be able to check my theory i don't know if there is one 1200XL in Poland, and even if i just couldn't afford it

as for 1mb upgrade when sold as diy kit price was 15 euro + shipment, and thus excluding eeprom for os/basic replacement (i didn't have them stocked) for others i need to do some BOM before i could talk about price i'm not that good at marketing, nor commerce thing more academic type if i may say so...

i don't know - maybe it's my english that is that bad all extensions are configurable by on screen display menu, overlayed on standard atari-generated video, or if you have one - on vbxe output you can have switch mounted in your atari, and it will work as desired, but thats pointless! the whole point of osd configurator was to get rid of those switches anyway - 1mb is satantronic compatible, and using the same bits in the same manner, so there is no full compatibility to what 130xe offsers - antic and cpu sees the same chunk of memory, it has 2 modes of operation - one is for +256kb, other one gives user full 1024k of additional ram sound of both pokeys and covox are downmixed to mono and present on din connector if anyone has any questions please post them here as for "commercial" part - please pm me

tetzz: its compatible, but smaller and easier to install than pajero, we talked about this, and pajero declared, that he will not make any more of his board in favor of mine, this one is using same software for pic that pajero's board, another opamps for audio amplifier, and its more compact basically one have to pull pokey out, instal socket, and put the board in - not that complicated i think compact size has some cons too - it will be hard for someone without proper soldering equipment to upgrade aki firmware, but as i was informed - this was final version form DarkDk danwinslow: there are three extensions presented here, sram based 1mb board, stereo with covox and aki, and osd configurator which i hope get some attention here and helping hand with graphics

if there will be any intrest in community - why not i got now only test run of 10pcs of stereo board, and today all parts have arrived, if there will be no problems with circuit, and any intrest in community to make another run then i will otherwise project will die from natural causes from those 10pcs only 3 have no declared owners

many new games are developed for 128k+ ram, so 130xe might still not be enought, as for the demoscene - it certainly wont be enought buying 130xe for additional ram is not good reason, buying it for future expansion might you can always expand your xl computer, but whatever your decision will be - stock memory capaciti might just not be enought regards candle

Hi all, i would like to present two extensions i've designed some time ago for 8bit atari it was targeted for xe computers (especially those equiped with 130xe pcb) and then adopted to work with xegs this is board for two pokey chips, 4 channel DAC for neotracker (covox), AKI interface, and simple amplifier responsible for sound mixing more photos this is 1mb extension board with glue logic (fitted in orginal memory managment chip socket of 130xe) as you can see, there is no basic on this board, basic now resides in same chip as OS, so it can be replaced by anything else one desire if someone would be interested in this here is a link for assembly instructions and GAL JDEC file i would really apreciated if someone could help me with this project this is simple osd configurator for any extension one could put in his atari. it displays information about current config and activity of given i/o lines (for example sio activity) version presented on those photos was based on atmega88 mcu running at 20mhz, due to demand of larger memory current version is atmega644 based, and display of 32 lines, 40 chars per line is possible start, select and option key is used to control osd, reset + select combination is used to activate the osd, alternativly external button can be used main goal of this was to get rid of those switches back on expanded atari machines (stereo on/off, memory on/off, system select etc) i would like to have animated logo of some kind at power on, but it would require graphic artist, and it seems there is noone in poland who would be interested in doing such more photos and obsolete schematics are here osd is compatible with rgb (vbxe) and s-video/cvbs output of atari vbxe owners can have osd displayed in color

this maybe outdated to reply, but still i couldn't resist firstly you don't need any plastic tools when adjusting focus (G3) or screen (G2) on flyback - in fact you may do it with your bare hands - that is if you're not clumsy to touch anything else doing so for others there are philips type screwdrivers for this - nothing fancy... size 1 or 0 will do secondly - you cannot expect picture to be focused if video amplifier has usually bandwidth of 6-7MHz and your input is RF or CVBS signal to make matter worse spot size at 21" crt intended for tv's is 1.2mm (or 50 mils for those living on the other side of road) thirdly magnetic rings on neck of the crt are for purity and convergence, not for chroma adjustments - and you really really have to work hard to render picture unusable on tv doing so best choice is to use s-vhs input and good quality tv that will give you best picture you will get from atari