sup8pdct

Superram 800 uses the original chips on the ram card.The unwanted power tracks have been cut. Added chips are; 74LS573. Latch for $CFFF 74LS133 74LS158 x 2 74LS112 74LS27 James

I have superram 800. axlon compatiable. will try and do up a schematic for it sometime soon. Do know that bank select is $CFFF. James

I did a score box program. heaps of numbers all over the screen. I kept them in memory as BCD. Used the math routines do multiply and divide for percentage and to convert to ATASCII then AND with $1F to put directly into screen memory. James

How do i download the files? a page pops up saying to wait 60 seconds but nothing happens. other links are adds or an exe file...... James

As far as i am aware, the 1400xl has 4 function keys. All XL OS from atari has function key support built in. Just need to hook them up. The Ebay item looks legit. Has parallel bus, XL style tv modulator (not 1200xl style), A DC power supply (1200xl has AC). James

Timed loop with cycle counting. Lots of NOP's used. The 8040 or 8050 only has 256 bytes of ram. To buffer a DD sector, one byte is stored in timer register leaving one byte free for a bit counter to bit bang 8 bits. James

One early bug was SIO timing was out for PAL machines. The updated rom works with both NTSC and PAL. Re data separator, Indus and 1050 use same family chip. Data separator uses adjustable external components. Need a scope to adjust them properly tho. James

The indirect JMP must never have the data starting on the last byte of a page. ie JMP ($xxFF) Lets say location is at $30FF The low byte will come from 30FF but high byte will come from $3000. James

If you can get an axlon memory card for the 800, the orignal SDX will run fine with a very small lomem. Not sure if the new one will recognize the axlon. James

I don't sucome to hints. Nup.never..... P.s I did a little work on this rainy day. 1090xl power schematic Model (1).pdf James

That narrowed it down a bit James

This should help you out a little. Is the tracks near power plug under some components. James

Maybe it is a case of the latest specification not being out there yet. If you look at some of the cards, you can see a regulator towards the front. James

did a little work Found what each pin does on the interface slots. pin function comment1 comment2 1 10v main power supply unregulated 2 10v main power supply unregulated 3 Extsel unbuffered 4 audio unbuffered 5 casinh 6 gnd 7 ref 8 MPD unbuffered 9 RDY unbuffered 10 irq unbuffered 11 ac signal via 220 resistor from power in not switched 12 reset 13 pin 37 pbi unbuffered -12v ? 14 Enable pin of address buff Pulled low via resistor (enable) 15 r/w dir of data transceiver from PBI 16 -12v very low current draw 17 A15 18 Gnd 19 A14 20 02 clock 21 A13 22 gnd 23 A12 24 +5v very low current draw 25 A11 26 all slots coms between slots? 27 A10 28 39 pbi unbuffered +12v ? 29 A9 30 47 PBI unbuffered (signal only) +5v 600XL only 31 A8 32 enable of data transceiver pulled high via resistor (disabled) 33 A7 34 D7 35 A6 36 D6 37 A5 38 D5 39 A4 40 D4 41 A3 42 D3 43 A2 44 D2 45 A1 46 D1 47 A0 48 D0 49 Gnd PBI only (pin 1) detects if computer connected? Other PBI GNDs to interface GND 50 +12V very low current draw Unless otherwise stated, all signals are buffered by either LS244 (address plus others) or LS645 (data) Found an older document with the +/- 12V at computer end (not on 600XL or 800XL). Would like to see what 1400/1450XLD had. James P.s formatted well from excel when 1st done. posting was a different look. very hurried edit. bed time for me now

The power in plug is larger so a 1050 one wont plug in, hence the red wire to try and power it up. The 10V supply is the main supply for each card. Each card has a voltage regulator for its own use. James

a couple of pics http://s1325.photobucket.com/user/sup8pdct/media/IMGP6215_zpsyvblk1oa.jpg.html[/url] http://s1325.photobucket.com/user/sup8pdct/media/IMGP6214_zpsbu6kzdzq.jpg.html[/url] Ignore red wire. I added it to try and power it up. James

Not much on it. power supply, couple of buffer chips and 5 slots. James

It is the same as disk version. The cart needs to be tested to see if can be turned back on again. Else power cycle is required. James

This rom cart image won't work in emulator as it get stuck in an endless copy/warm start loop due to cart not being able to be turned off. ie no such cart profile in emulators. I have made an .XEX file that does work in emulator (atari800win). OS rev A or B required. Is same as disk based version. kdos whole.xex James

Here is list of commands from superarchiver for the 1050. I can provide source that i worked on long time ago. 7920 W19 .BYTE "PRSW!",$22,"Os?N" 7930 .BYTE "fqutZBbCDFGLTg" James

Change .xex to .car James

Try this one. It first one posted with headers and run addresses removed. James GYRUSS.xex

How many people here know that Synassembler has BLT (Branch onless than) and BGE (branch on greater or equal) branch instructions? They are the same as BCC and BCS. James

Is the wire soldered to the resistor next to the ram chip clear of the pad? If computer screen goes black, it usally means that rom has been found and running but ram isn't working. Do you have star raiders cart? plug that in and see what happens. James

What is on floppies doesn't match the working program. No idea which is the latter version tho. Also the latter floppy versions source isn't all there. I believe there should be another disk. James