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Last update: 8 August 2010

IC number:27C64, 2564
IC function:64 kbit (8k×8) EPROM
Related components:128 kbit (16k×8) EPROM, 256 kbit (32k×8) EPROM, 1 Mbit (128k×8) EPROM

Component documentation
IC numberManufacturerDocumentation
NMC27C64National SemiconductorNot available
TMS2564Texas InstrumentsNot available

Component versions
IC numberPackageAccess timeReplacement parts
NMC27C64Q-20028-pin Ceramic DIP200 nsM27C64A-20F1 available from:Conrad
TMS2564JL28-pin Ceramic DIP

Programmed components
IC numberCBM part numberCBM part descriptionChip descriptionChecksum
NMC27C64Q-200390230-03Z80 firmware A20902FEF
NMC27C64Q-200318855-01Character ROM PC-I364A
TMS2564JL251104-04R2364 ROM KernalKernal ROM SX 64

Positions
DevicePositionComponentPackageSoftware
A2090AU3627C64DIP390230-03 (2FEF)
PC-IU6927C64DIP318855-01 (364A)
SX 64 CPU boardUD32564DIP251104-04R

Pinout 27C64
PinTypeName
1PowerVPP
2InputA12
3..10InputA7..A0
11..13OutputO0..O2
14PowerGND
15..19OutputO3..O7
20InputCE_
21InputA10
22InputOE_
23InputA11
24..25InputA9..A8
26N/CNC
27InputPGM_
28PowerVCC

Pinout 2564
PinTypeName
1PowerVPP
2InputCS1_
3..10InputA7..A0
11..13OutputQ0..O2
14PowerVSS
15..19OutputQ3..O7
20..21InputA11..A10
22InputPD/PGM_
23InputA12
24..25InputA9..A8
26PowerVCC
27InputCS2_
28PowerVCC

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