BETADISK ASSEMBLY PART LIST:


U2 74LS04
U3 74LS30
U4 74LS32
U5 74LS32
U6 74LS32
U7 74LS74
U8 74LS123
U9 74LS245
U10 27C256 PROGRAMMED ROM
U11 WD2793
U16 74LS367
U17 74LS161
U19 74LS04
U20 7417 OR 14LS07
cRYSTAL 4 MHZ
Q2 BC 639 OR 2SC1815
D1 TO D11 1N4148 (11 PIECES)
R1 (NOT FITTED) R11,23,10,24,26,25,3,2,5 5K6
R9,8,18,17,7,16,22,19 1K
R15 220R
R20,21 10K
R14 3K3
R4 470R
R6 120K
R12 VARIABLE RES 50K
R13 VARIABLE RES 10K
C13 220NF
C14 VARIABLE CAP 6-70 pf
C24,6,7,12,10,26,8,3,4,22,25,20,21,23,9,2,19 100NF
C 15,C17 100-220 UF 16V
CX 10UF/16V (SEE PHOTO)
S1 TACTILE SWITCH
S2 OS202011MS2QN1
J2 34 pin floppy connector




beta (470 kB)


pcb1 (174 kB)

ROM file for AT27c256