Memory Expansion Board (250-4030) Settings Faxback Doc. # 2027 Note: Refer to Faxback Doc. # 2029 for Board Layout. Use two 250-3062 Ram Kits per .5meg; the chip kit contains nine 256K X 1 DRAMS at 150 nanoseconds. This Board comes configured with 1 Meg of memory: Bank S1-5 S1-6 (+) normal configuration 0 On On (512k) (ON is towards the switch number) 1 Off On (1 Meg) (+) 2 On Off (1.5 Meg) 3 Off Off (2 Meg) Board S1-1 S1-2 S1-3 S1-4 1st Off On On On (+) 2nd Off Off On On 3rd Off On Off On 4th Off Off Off On 5th Off On On Off 6th Off Off On Off 7th Off On Off Off Start Start Start Start Address Address Address Address Board Bank0 Bank1 Bank2 Bank3 1st 100000 180000 200000 280000 (+) 2nd 300000 380000 400000 480000 3rd 500000 580000 600000 680000 4th 700000 780000 800000 880000 5th 900000 980000 A00000 A80000 6th B00000 B80000 C00000 C80000 7th D00000 D80000 E00000 E80000 S1-7 and S1-8 Off (+) *Note: Dip switch number 8 is used to disable the first board installed (Address 1.0MB thru 1.5MB) for other options which use this address space. To select this option configure dip switch 8 to the "On" position, on the first memory board installed only. Set dip switches 5, 6 and 8 On (0) or Off (1) as follows: 5 6 8 ON ON OFF If only bank 0 contains memory chips. OFF ON OFF If banks 0 and 1 contain memory chips. ON OFF OFF If banks 0,1, and 2 contain memory chips. OFF OFF OFF If banks 0,1,2, and 3 contain memory chips. *NOTE: Dip switch 7 is not used. Dip switch 8 is used to disable the first 512K memory on the first board installed (address 1.0 MB through 1.5 MB) for other options which use this address space. To select this option configure dip switch 8 to the ON position on the first memory board installed only. 5. Set the start address of memory bank 0 by setting dip switches 1-4 ON (0) or Off (1). The dip switches are to be set on 1 megabyte boundaries depending upon whether the Memory Expansion Board is the 1st, 2nd, 3rd... or last (7th), Memory Expansion Board in the computer. DIP START START START START SWITCHES ADDRESS ADDRESS ADDRESS ADDRESS 1 2 3 4 BANK 0 BANK 1 BANK 2 BANK 3 1st Brd. Off On On On 100000 180000 200000 280000 2nd Brd. Off Off On On 300000 380000 400000 480000 3rd Brd. Off On Off On 500000 580000 600000 680000 4th Brd. Off Off Off On 700000 780000 800000 880000 5th Brd. Off On On Off 900000 980000 A00000 A80000 6th Brd. Off Off On Off B00000 B80000 C00000 C80000 7th Brd. Off On Off Off D00000 D80000 E00000 E80000 (RJS/jej-12/10/94)
Amiga7878