Aleste 520EX - Schematics

Schematics and Chipset for Aleste 520EX

Schematics (edited, with corresponding western part numbers)

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  Schematic 1/4

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  Schematic 2/4

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  Schematic 3/4

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  Schematic 4/4

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  Component Map

For reference, the original unedited schematics are here: Sheet 1, Sheet 2, Sheet 3, Sheet 4, and Component Map

Aleste Chipset

Main Chipset

pcs russian    western  description    location
 1  Z80A CPU   Z80A     CPU            (D30=sheet2)
 1  UM6845     6845     CRTC           (D25=sheet2)
 1  AY-3-8910  AY3-8910 PSG, Dual I/O  (D18=sheet2) (with TWO I/O ports, unlike as in CPC)
 4  KR1802IR1  ?        RAM 16x4       (D60,D61=sheet2=palette, D62,D63=sheet4=keyboard)
 1  KR1810WG72 uPD765   FDC            (D70=sheet3)
 1  KR580WI53  8253     baudrate timer (D33=sheet4) (/CS=/CS53, A0,A1=A0,A1, D0-D7=AY0-AY7=PPIpa) (/WR only, no /RD) (CLK0,CLK1=WGPTCLK=16MHz/n, see sheet3)
 1  KR580WW51A 8251(A?) usart/mouse    (D34=sheet2) (A12=/CS, A8=C/D)
 1  KR580WW55A 8255     PPI            (D17=sheet2)
 1  KR512WI1   MC146818 RTC            (D19=sheet2)
 16 K565RU7K   HM50256  DRAM 256Kx1    (D1..D16=sheet3) (512Kbyte)
 1  K573RF4    27512    EPROM 64Kx8    (D31=sheet2) (BIOS/BASIC/BOOT/AMSDOS)
 2  K573RF2    2764     EPROM 2Kx8     (D62=COLDAT=sheet1, D65=VDKEY=sheet1)
 1  K155RE3    27S18    PROM 32x8 OC   (D69="Af"=sheet3=floppy) (dummy FP0..FP3, disk /GATE, to D72 count --> DW --> FDC)
 2  (KR)556RT4 27S20    PROM 256x4 OC  (D28="M"=MAP14..MAP17=sheet2, D67="R"=ROMEN/RAMEN etc.=sheet1)

Further Chips

pcs russian    western  description              location
 1  K170AP2    SN75150  rs232 dual line driver   (D86=sheet4)
 1  K555AP6    74LS245  8bit 3state tranceiver   (D89=sheet3)
 2  K555ID4    74LS155  2x2bit decoder/demult    (D54=sheet1, D74=sheet3)
 1  K555ID10   74LS145  bcd demultiplexer        (D80=sheet4)
 1  K555IE5    74LS93   4bit (1bit+3bit) counter (D72=sheet3)
 1  K555IE10   74LS161  4bit counter             (D37=sheet1)
 4  K555IR11A  74LS194  4bit shift register      (D39,D49=sheet1, D50,D51=sheet2)
 4  K555IR22   74LS373  8bit 3state latch        (D45,D46,D47,D48=sheet1) (RAM 16bit-to-8bit cpu/vram bus)
 2  K555IR23   74LS374  8bit 3state flipflop     (D58=sheet3, D84=sheet4)
 2  K555IR32   74LS170  4x4bit register file OC  (D87,D88=sheet2)
 6  K555KP2    74LS153  2x 4vstup. multiplexer   (D20,D21,D22,D23,D52,D53=sheet2)
 2  K555KP7    74LS151  8bit multiplexer         (D24=sheet2,D81=sheet4)
 1  K555KP11   74LS257  8-to-4 data selector     (D38=sheet1) (clock select)
 1  K555KP12   74LS253  2x 4vstup. multiplexer, TS "8-to-2 line 3-state noninverting data selector/multiplexer" (D26=sheet3)
 .. K555LA3    74LS00   Quad NAND gates          (various)
 .. K555LE1    74LS02   Quad NOR gates           (various)
 .. K555LI1    74LS08   Quad AND gates           (various)
 .. K555LL1    74LS32   Quad OR gates            (various)
 .. K555LN1    74LS04   Hex inverters            (various)
 1  K555LN2    74LS05   Hex inverters, OC        (D76=sheet3)
 5  K555TM2    74LS74   Dual flipflop            (D40,D77,D66,D57=sheet1, D71=sheet3)
 6  K555TM9    74LS174  6bit flipflop            (D32,D55,D56=sheet1, D59=sheet2, D68=sheet3, D79=sheet4)
 1  K561IE10   MC14520B dual up binary counter   (D63,D64=sheet1)

Chipset Notes

• The part numbers printed on the chips may look like "KPxxx" (cyrillic) instead of "KRxxx" (latin).
• As mentioned at chipdir, KR1802IR1 is similar to AM29705, but NOT the same (the AM29705 has four additional data pins).