sorry - my bad
i got 573

there was bus conflict with RAM chip as my equations for RD was just !RW rather than !(!RW & PHI2)
after fixing this i got it up and running
Thanks

next step - to make it run faster

After long period of not touching 65c816 i've tryed to add some "linear" memory to the system
system runs at clock rate of 1.77MHz, and some of You would say one can run with a murder with such slow clock rate
so i've did what datasheet says - added inverter to phi2in signal, and used this as my LE ...

i have to say that 44 pin connector is not standard one, most of vga/xvga lcd panels wants their data to be serialized you have few clock lines, and 8 bit of data - transfer is r then g then b, and so on until you reach end of line

as far as i am concern i _MIGHT_ be able to order small quantity of such chips/carts (50 or so, not so important if it would be single chip solution - more important if it would fit in 100mils raster) but i cannot guaratee anything
framebuffer transparency would be essential here and genlock ...

:]
kc5tia maybe you use 5:5:5 scheme and save that one bit for alpha channel? :>

kc5tia: what do you mean by "tiled mode"?

atari 2600 was on polish market after atari 800xl and 65xe, not to mention pegassus (clone of NES) - so watching this graphics was nothing more than empty laught for every polish folk - this is base of my opinion...
atari 5200 and 7600 never get here, and ...

i don't say that sprites are irrelevant, or sth, i just want to put here some others things to consider
what kind of game you can do with sprites only? international karate?
i'm a bit exagerating now, but for a reason
and phleease :] don't tell me about atari 2600 :D poor thing has one chip (stella ...

greener: you don't really need to transfer anything from auxilary buffer to main buffer, just swap buffers! this may be done by simply multiplexing CS line of those memories
problem with double buffering is when you have static display - you need to draw whole screen twice, and you have to wait for ...

tancor: i already suggested double buffering technique some posts ago
7 pages long, no conclusions, and counting

it's a bad ide :/
1mhz and digital scope.. brrr...
in poland similar device costs $237 and noone buy it..
you can have digital scope with 12mhz bandwith (it comes as diy kit, you connect it to pc for display, software included)
and trully analog 1 trace scope for $170
you may want to look at http ...

atari xl/xe is capable of producing 192x226 with 4 colors, and 384x226 with 2
interlaced modes are able to produce XXXx226 and number of colors is up to 120 of 256 on screen at one time. XXX because X resolution varies from line to line in those modes depending on what colors are used
examples of ...

didn't you say you don't have any experience in fdc?
i tell you to stop acting as a guru, and thats big diffrence :]
i cannot verify if its possible to do mfm decoding or gcr decoding with blitter, but its primary task ist graphics and this is simple dma controller with boolean operations capability

Garth, i'm really need this megabyte
if anyone wants to look on discussed circuit its here:
http://alan.umcs.lublin.pl/~candle/atari/simm/
and i'm planning to do next project using full address space avial for '816 so drams are my only option
anyway - i'm sorry i mislead you writing about ...

this is true
commodore 64 has only 16 colors, but this doesn't stop artist from creating (belive me or not) breath taking pictures - they use interlace, and few other techniques but still - this is only example of fixed pallette system

to extend your knowledge amiga/commodore computers/disk drives were quite stupid - they read, yest, thats true, but raw data - it was cpu task to decode data into sectors - you got only bucket of bits after read, and you had to decode it by hand
for diffrent clock rates i though of 1 2 or 4mhz so it ...