jedie Posted July 29, 2021 Share Posted July 29, 2021 http://www.ataripc.net/biosrom-images/ contains the ROM versions 3.05, 3.06, 3.07 and 3.08... Does anybody knowns something about the changes in these versions?!? The question is: The floppy controller chip "Intel P8272" seems to support HD disk drives. But my ROM v3.05 does only support DD... Quote Link to comment Share on other sites More sharing options...
jedie Posted August 9, 2021 Author Share Posted August 9, 2021 btw. has anybody successfull tried the Super PC/Turbo XT BIOS ? http://www.phatcode.net/downloads.php?id=101 https://github.com/andreas-jonsson/pcxtbios On a PC1, PC2 or PC3 ?!? I only made a quick test, that doesn't work. Think it's needed to include the ROM for the onboard EGA Graphics (NSI Logic EVC315-S)... Quote Link to comment Share on other sites More sharing options...
jedie Posted August 16, 2021 Author Share Posted August 16, 2021 I read my v3.05 ROMs on my Atari PC1 via "GETBIOS.COM" The DOS programs creates three files: C000.ROM E000.ROM F000.ROM It seems that E000.ROM is only "garbage"... C000 and F000 contains the real ROM. I just glue the real ROM together and compares the String in it with the newer one: 3.06 -> First 20734 Bytes are identical. There are some new Strings: Quote MOTHERBOARD PARITY ERROR IO CHANNEL PARITY ERROR Diff between 3.06 and 3.07 looks differently than 3.05 vs. 3.06 -> The first ~8KB seems to be completely different. Think this is the NSI Video BIOS part, isn't it? 3.07 vs. 3.08 -> First part is equal. Seems that 3.08 adds some new code in a empty space. It contains additional Strings: Quote ATARI REAL TIME CLOCK ERROR CMOS RAM ERROR, CHECK BATTERY I collect all date timestamps (These timestamps are in the BIOS but didn't printed on boot). First is the BIOS, second is the Video BIOS: v3.05 - 09/17/87 - 9/26/86 v3.06 - 10/01/87 - 9/26/86 v3.07 - 10/19/87 - 2/9/87 v3.08 - 12/15/87 - 2/9/87 My conclusion is: v3.05 -> v3.06: Adds Parity checks v3.06 -> v3.07: Update NSI Video BIOS v3.07 -> v3.08: Adds RTC Support About RTC: Maybe a solution like https://hackaday.io/project/168972-rtc-isa-8-bits-pcxt in a XT-Adapter will work? Another Question: Will it be possible to read the ROM via XTIDE? Are the ROM EPROM pin compatible? And can i flash a new version on a AT28C256 and use it in the PC1 ?!? 1 Quote Link to comment Share on other sites More sharing options...
Mazzspeed Posted August 16, 2021 Share Posted August 16, 2021 The PC1's a pretty rare machine, I've personally never even seen one. I honestly don't know if anyone here will have the answer you're looking for, as while it's an 8bit Atari machine, it's the wrong type of 8bit Atari machine. Quote Link to comment Share on other sites More sharing options...
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