
BillC
Members-
Content Count
2,546 -
Joined
-
Last visited
Community Reputation
841 ExcellentAbout BillC
- Currently Viewing Forum: Atari 8-Bit Computers
-
Rank
River Patroller
Profile Information
-
Gender
Male
-
Location
BC Canada
Recent Profile Visitors
-
Current preferred solution for archiving 5.25" disks?
BillC replied to x=usr(1536)'s topic in Classic Computing Discussion
This was due to a bug in the 810 drive, DATA was read/written inverted. Atari stayed with this format on later drives for compatibility reasons. -
Not all ICs fail under the same conditions, when I had an INGOT power supply go over-voltage it only damaged 41256 DRAM and all the other ICs were fine. It is possible that the 4116 on the good card were made by a different manufacturer and can tolerate slightly higher voltage. You don't have to open the 800 to check the +5V/+12V outputs, they are available on pins 10/12 of the SIO port, pin 4 being ground.
-
An LCD displays information that would be off the screen with a CRT, mytek developed a circuit called V-Gate that blanks the chroma/luma signals outside of the normal borders. https://ataribits.weebly.com/vgate.html
-
The power supply board has a 7805 and a 7812 voltage regulator, the -5V circuit is controlled by a zener diode. There is a 33 ohm resistor across the input and output of the 7805 regulator which requires a load to check the voltage, unless you disconnect it first. Since it appears to be only the RAM failing it is likely not the +5V at fault, since that would also tend to damage the logic chips. Schematics are available at http://www.jsobola.atari8.info/dereatari/schematy.htm, they do have some errors but are reasonably accurate.
-
Have you checked all the voltage outputs on the power supply board, 4116 chips need all 3 voltages to operate, any one of them being out of specification could damage chips. The +12V supply is only used for 4116 RAM, the color adjustment pot, and a power output on SIO, the -5V supply is only used for 4116 RAM and the power LEDs.
-
I mentioned COVOX in post#9, it's near the cartridge port and marked on the silkscreen. The module I don't know is in front of the stereo POKEY module, and to the right of the OS module.
-
The shipment was likely returned to Lotharek, which is why he sent the refund. I would have thought he would try to contact you first though.
-
1MB SIMM upgrade Stereo POKEY Lotharek2009COVOX module LotharekOS module There's another Lotharek module below the stereo POKEY that I don't know.
-
Could RPi be used for Atari HDMI output? Like this:
BillC replied to manterola's topic in Atari 8-Bit Computers
I've paid $5 or $6 for a DVI to HDMI adapter, which allows the use of any HDMI cable. -
Just be aware that it still may not work properly, I don't think it will support the ESC/P commands that most Atari 8-bit printing software uses.
-
Available on eBay. https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=6532+dip+ic&_sacat=0&LH_TitleDesc=0&_sop=15&_osacat=0&_odkw=6532+ic
-
I'm not certain that I remember this correctly but I believe the PRC serial port may be capable of 19,200 BAUD, double that of the 850.
-
Atari Cassette Enhancer and Cassette Operating System are both available at atarionline under Utilities\5. Tape recorder: http://atarionline.pl/v01/index.php?ct=nowinki&ucat=1&subaction=showfull&id=1613724684
-
New Hardware: Atari 400/800 Super Color CPU Card
BillC replied to tf_hh's topic in Atari 8-Bit Computers
https://atariage.com/forums/topic/260646-new-hardware-atari-400800-super-color-cpu-card/?do=findComment&comment=3717999 -
You have a 256KB upgrade which replaces the original 64KB, so the increase is only 192KB or 3 banks of extended memory. The "missing" 64KB is doing what the original RAM did before the upgrade.