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1MB lot 8pc NOS Mitsu. 256x4 70ns 20pin DIP Memory FPM DRAM Apple-Amiga-PC VRAM
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1MB lot 8pc NOS Mitsu. 256x4 70ns 20pin DIP Memory FPM DRAM Apple-Amiga-PC VRAM
Price: US $16.00
item - 8pc lot of NOS (new, old stock) 1mb 20pin DRAM DIP chips, 70ns Mitsubishi 5V FPM (Fast Page Mode). Each chip is 256k x 4 bits (or 1 megabit) thus 8 chips equal 1 megabyte (non-parity). This is the most common \"large\" DIP for legacy Apple II, Amiga, etc RAM expansion (over 1 MB max). The most common \"small\" DIP (1 MB max & under) is the 256k x 1 16pin DIP (see other listings). Besides various legacy RAM uses, these are the common \"VRAM\" chips used on (later) 1MB ISA SVGA video cards (Tseng, Oak, etc).from Amiga Hardware Database (online)...All A3000s have 1 MB Chip RAM (eight 44256k 120 ns DRAM DIPs) soldered to their motherboard. Eight 20 pin DIP sockets accept another 1 MB.Fast RAM can be installed either via DIPs or ZIPs. Eight 20 pin DIP DRAM sockets accept 4 MB and 32 ZIP sockets accept 16 MB Fast RAM. The ZIP sockets are split into four banks (bank 0-3), where the first bank is hardwired to the DIP Fast RAM sockets (bank 0). Thus the two types of Fast RAM cannot be used together in bank0. The ZIP DRAM sockets accept either 1M×4 or 256k×4 80 ns ZIPs in groups of eight (one bank) but all the banks have to have the same sized chips. The RAM chips can be either static column or page mode ones. Static column ones support burst memory access and so they perform 10% faster.Many A3000s shipped with 1 MB 80 ns Fast RAM installed in the DIP sockets, which were intended to be moved to the empty Chip RAM sockets later on.Make sure to check your DIP sockets (pin count) and memory manager specs for Fast Page Mode and capacity - some memory managers allow multiple capacity chips (256x1 or 256x4, etc) but rarely mixed.cond - xlnt functional & cosmetic cond - NOS in original tubes

1 MB non-parity lot specs :

  • 8pc 256k x 4 bit DIP chips
  • 5v FPM (Fast Page Mode)
  • 20 pin, tin leads
  • 70ns access time
  • Mitsubishi M5M44256BP-7 - Japan

will post 9pc parity lots per request

returns - NO returns unless defective - 30 day warranty

shipping USA - USPS 1st class - no charge local pickup - combined shipping whenever possible (will refund excess on multi BIN items) - usually ship within 2 days of payment - chips will ship in chip vaults, original tubes, or cut down tubes pending order quantity and destination

shipping International - USPS Int\'l 1st Class to Europe, Canada, Australia & Japan, please email for other locations. Label will show actual item cost (not gift) and buyers are responsible for any import tax. Major USPS rate increase Jan 17, 2016...no more single oz rates, now single rate up to 1/2 lb (8 oz) then next single rate up to 2 lbs. I have no control over this new rate method, but will combine shipping whenever possible (wait for invoice if multiple listings) and will subsidize the \"country differential\" into a flat rate of $10 for 1st 1/2 lb.

payment - PayPal only - please remit within 3 dayscomms - Please keep pre & post sales comms within messenger, will respond within 24 hrs.
Personal Profile: middle-aged tech with a flair for legacy stuff

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