Lynxman Posted August 2, 2010 Share Posted August 2, 2010 Hello all, i made 2 new Falcon memory boards. The first board use PS/2 simm and the second board use chips. The PS/2 board is cheaper, but you need to modify the shielding of the Falcon. The contacts of the PS/2 socket is made with gold contacts. I have ordered only 20 PCBs of this board and there will be no additional. I have only 12 PS/2 sockets in stock, so i will sell some of them without it. (Or maybe i will find a source for it.) For this board i can not give a guarantee that it will work with modified Falcons. Because my Falcon is running with 16MHz or 32MHz for the CPU but the system bus is 16MHz. And it depend to the PS/2 simm if it will work with higher bus clock. Used PS/2 simms: TI, Micron, Samsung, Hitachi There is no need to modify the shielding with the other board. And there are no additional contact resistance between Memory and PS/2 socket and the lines to the memory chips are shorter. This board is a modified version from my white 14MB Falcon memory board. This boards was tested with several Falcons in different configurations with speeders, bus clock mods etc. I am sure the black board works on every Falcon. The tests with this board was always fine. At the white board the chips was soldered to the top-side, at the black board the chips are soldered to the bottom side. Used chips: Siemens, TI, Samsung, NEC Both boards have a jumper to select 4 or 14MB. It is possible to connect to a switch. (switch not included) All boards (of cause, the version without the PS/2 socket i can not check!) will be checked with my Falcon. Price: Black board with chips: 40 Euro PS/2 board including PS/2 simm: 30 Euro PS/2 board without PS/2 simm: 26 Euro PS/2 board without PS/2 socket and without PS/2 simm: 22 Euro For shipping etc. please send me a PM with our adress. 3 Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/ Share on other sites More sharing options...
Lynxman Posted August 5, 2010 Author Share Posted August 5, 2010 Additional Information: The chips i use for the black board are all with 60ns speed! Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2066481 Share on other sites More sharing options...
amarok45 Posted October 30, 2011 Share Posted October 30, 2011 Hello Lynxman! At last I found someone who may provide me with a 14MB Falcon memory board. Do you still have some of them? Please, let me know the way of getting one. Best regards Yann SAVENYE Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2398729 Share on other sites More sharing options...
Mark_G Posted November 1, 2011 Share Posted November 1, 2011 (edited) Why don't you place the simm holder for the PS/2 sim's at the underside of the board ? Then, no shielding work must be done. Mark Edited November 1, 2011 by Mark_G 1 Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2399819 Share on other sites More sharing options...
Lynxpro Posted January 31, 2012 Share Posted January 31, 2012 Is there any way to recover the lost 2MB that the Falcon won't address and use it as a RAM disk or something? I can't remember what 14MB board is in my Falcon but it is a shame that 2MB is lost when installing the usual 16MB SIMMs. I've seen other boards [like the CT63] that can go up to around 512MB but addressing that much RAM seems to require a CPU more powerful than the stock 68030... Just thought I'd ask this since this is a related thread and an active one at that... Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2455842 Share on other sites More sharing options...
+DarkLord Posted January 31, 2012 Share Posted January 31, 2012 Is there any way to recover the lost 2MB that the Falcon won't address and use it as a RAM disk or something? I can't remember what 14MB board is in my Falcon but it is a shame that 2MB is lost when installing the usual 16MB SIMMs. I've seen other boards [like the CT63] that can go up to around 512MB but addressing that much RAM seems to require a CPU more powerful than the stock 68030... Just thought I'd ask this since this is a related thread and an active one at that... AFAIK, that 2 megs is reserved by TOS for hardware. I'm not sure I'd want to mess with it. Maybe someone with more knowledge can clarify this... Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2455886 Share on other sites More sharing options...
+rdemming Posted January 31, 2012 Share Posted January 31, 2012 The Falcon uses only 24 address lines (even while the 68LC030 has 32) limiting the memory range to 16MB. The top 2MB is reserved for ROM and memory mapped IO. This increases compatibility with older software (68000 based) since the 16MB address range is repeated in the 32bit logical address space just as with the 68000. Most software uses the faster word addressing mode (specifying only 16 bits of a 32 bits address) to access the IO range. Normally these word addressing modes addresses $00000000-$00007FFF and $FFFF8000-$FFFFFFFF but on an 68000 (with 24 address lines) the IO area $00FF8000-$00FFFFFF is automatically mirrored in the $FFFF8000-$FFFFFFFF area thus enabling the use of word addressing for the IO area. On an Atari TT with full 32 bit address range, the IO range is mirrored in the $FFFF8000 area for backward compatibility by the TT's addressing logic. So that is the reason why the upper 2MB is hidden and is not accessible. However, it is possible to make this space available by a technique already used on Atari 8-bits named bank-switching. With an hardware modification you could for example redirect access to $00C00000-$00DFFFFF to the last 2MB of the memory. You could use for example the soundchips Port A bit 2 (officially the drive 1 select but there is no 2nd floppy driveon the Falcon) to switch the bank, controlling address bit 17 of the memory when bits 19-17 of the address bus are '110'. Things only get a little bit more complicated because drams use rows/columns addressing so there is not really an address bit 17 on the memory chips. Thus you need to translate address bit 17 of the memory to the proper combination of MADR & RAS/CAS signals. Robert 1 Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2455905 Share on other sites More sharing options...
+rdemming Posted January 31, 2012 Share Posted January 31, 2012 As an additional note, bankswitching like this only works correctly when the software has full control of the machine or when the OS is aware of the bankswithced memory. Normally other programs could be loaded and may reside in the bankswitched area. In that case the other program could be swapped out and crash if the software is switching banks. Robert Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2455915 Share on other sites More sharing options...
Lynxpro Posted February 1, 2012 Share Posted February 1, 2012 The Falcon uses only 24 address lines (even while the 68LC030 has 32) limiting the memory range to 16MB. The top 2MB is reserved for ROM and memory mapped IO. This increases compatibility with older software (68000 based) since the 16MB address range is repeated in the 32bit logical address space just as with the 68000. Most software uses the faster word addressing mode (specifying only 16 bits of a 32 bits address) to access the IO range. Normally these word addressing modes addresses $00000000-$00007FFF and $FFFF8000-$FFFFFFFF but on an 68000 (with 24 address lines) the IO area $00FF8000-$00FFFFFF is automatically mirrored in the $FFFF8000-$FFFFFFFF area thus enabling the use of word addressing for the IO area. On an Atari TT with full 32 bit address range, the IO range is mirrored in the $FFFF8000 area for backward compatibility by the TT's addressing logic. So that is the reason why the upper 2MB is hidden and is not accessible. However, it is possible to make this space available by a technique already used on Atari 8-bits named bank-switching. With an hardware modification you could for example redirect access to $00C00000-$00DFFFFF to the last 2MB of the memory. You could use for example the soundchips Port A bit 2 (officially the drive 1 select but there is no 2nd floppy driveon the Falcon) to switch the bank, controlling address bit 17 of the memory when bits 19-17 of the address bus are '110'. Things only get a little bit more complicated because drams use rows/columns addressing so there is not really an address bit 17 on the memory chips. Thus you need to translate address bit 17 of the memory to the proper combination of MADR & RAS/CAS signals. Robert What he said. (Thanks!) Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2456546 Share on other sites More sharing options...
monsoft Posted August 15, 2012 Share Posted August 15, 2012 @Lynxman: are you still selling these boards ? Could be black one or blueone with simm Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2578779 Share on other sites More sharing options...
bartek030 Posted October 28, 2013 Share Posted October 28, 2013 I've just received and installed Black memory board, works like a charm Thank You Lynxman Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2855604 Share on other sites More sharing options...
zorro Posted December 11, 2013 Share Posted December 11, 2013 Santa came early this year. Memory works perfekt. Thank you Lynxman Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2883588 Share on other sites More sharing options...
Justin Payne Posted December 18, 2013 Share Posted December 18, 2013 I think this is a good Xmas gift for myself. Hopefully he has more available. Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2887910 Share on other sites More sharing options...
+Guitarman Posted December 24, 2013 Share Posted December 24, 2013 I think this is a good Xmas gift for myself. Hopefully he has more available. He is suppose to be making some more in a few weeks. Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-2891965 Share on other sites More sharing options...
gibs Posted September 14, 2014 Share Posted September 14, 2014 Hello, I'm interested by a PS/2 board including PS/2 simm. Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3072406 Share on other sites More sharing options...
Darkman1088 Posted January 10, 2015 Share Posted January 10, 2015 Very interested in purchasing one of these boards (either will do, though prefer one I don't have to modify the shielding for). Could you let me know how I would go about placing the order / paying for it? (Do you accept PayPal?) Thanks, Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3150574 Share on other sites More sharing options...
Lynxman Posted January 11, 2015 Author Share Posted January 11, 2015 I will send you PM. Information for all: The blue board is sold out. The black board is available. The price changed to 55 Euro. The price for the PCBs and the Chips (NOS chips are used) increased. Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3150825 Share on other sites More sharing options...
ovikspojken Posted January 17, 2015 Share Posted January 17, 2015 I am also interested in buying a memoryboard Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3155612 Share on other sites More sharing options...
AnimaInCorpore Posted March 19, 2015 Share Posted March 19, 2015 I would like to buy one as well. Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3201086 Share on other sites More sharing options...
Lynxman Posted March 21, 2015 Author Share Posted March 21, 2015 @all: if you want to buy a Flacon 14MB, please sned me PM! Because not checking here every day! Information: Only black board available. New price 55 Euro. (Price increase memory chips, real NOS, no fake china NOS) Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3202889 Share on other sites More sharing options...
AnimaInCorpore Posted March 24, 2015 Share Posted March 24, 2015 (edited) Wow, that was fast... I've received the ordered black board today and it works like a charm in my second Falcon. Thanks a lot! Cheers Sascha edit: spelling Edited March 24, 2015 by AnimaInCorpore Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3204789 Share on other sites More sharing options...
EamonShoot Posted May 24, 2015 Share Posted May 24, 2015 PM sent to Moonsweeper requesting purchase. Many thanks! Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3243570 Share on other sites More sharing options...
davide giuffrida Posted July 26, 2015 Share Posted July 26, 2015 Hi ! I also need a falcon memory upgrade...i sent you a Pm.... Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3285922 Share on other sites More sharing options...
Checksum Posted September 26, 2015 Share Posted September 26, 2015 I ordered an upgrade 2 weeks ago. Lynxman send it the next day, and i received it 3 days later. Packaging is fine (good protection) and the product is really a quality one. Off course it works out of box, and i can use multitasking OS (FreeMINT + XaAES) without troubles . Thank you Lynxman ! Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3330488 Share on other sites More sharing options...
leech Posted December 12, 2015 Share Posted December 12, 2015 I just sent a PM for one too. Just got my Falcon today, time to start upgrading it Quote Link to comment https://forums.atariage.com/topic/167006-new-14mb-falcon-memory-boards/#findComment-3389824 Share on other sites More sharing options...
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