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4066 Logic IC

CMOS 4066 IC

Common symptoms when faulty: Colour problems such as random colour “chequerboard” pattern on screen or no colour.

Price: £ 0.75   (18 in stock)
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7406 Logic IC

7406 Logic IC

Common symptoms when faulty: Blank screen. Partial failure: Drive access problems: Drive resets but “device not present” error when accessed.

Price: £ 0.99   (13 in stock)
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74HCT00 Logic IC

74HCT00 Logic IC

  • A cheaper, modern replacement for the 74LS00 logic IC in the ZX Spectrum
Price: £ 0.50   (24 in stock)
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74HCT157 Logic IC

74HCT157 IC

  • A cheaper, modern replacement for the 74LS157 logic IC for ZX Spectrum
Price: £ 0.60   (13 in stock)
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74HCT32 Logic IC

74HCT32 Logic IC

  • A cheaper, modern replacement for the 74LS32 Logic IC in the ZX Spectrum
Price: £ 0.50   (10 in stock)
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74LS00 Logic IC

74LS00 Logic IC

  • Replacement logic IC for the ZX Spectrum (Quad NAND gate)
Price: £ 0.89   (8 in stock)
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74LS04 Logic IC

74LS04 Logic Inverter IC

As used in Issue 6A Spectrum motherboards and also on some models of Spectrum 128

Price: £ 0.75   (17 in stock)
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74LS08 Logic Chip

74LS08 Logic IC

Common symptoms when faulty: Normal startup border but screen full (or nearly) of garbage characters.

Price: £ 0.68   (16 in stock)
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74LS139 Logic IC

74LS139 Logic IC

Common symptoms when faulty: Blank screen.

Price: £ 0.80   (18 in stock)
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74LS14 Logic IC

74LS14 Logic IC

As used in the C64C, 1541 disk drive etc

Price: £ 0.68   (17 in stock)
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74LS157 Logic IC

74LS157 IC (Texas Instruments)

  • Logic IC used in the ZX Spectrum (multiplexor chip) and in some models of Spectrum 128
Price: £ 0.80   (14 in stock)
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74LS245 Logic Chip (65245)

74LS245 Logic Chip (65245 equiv.)

  • Used at positions UD8, UE8, UF8 - can cause blank screen when bad.
Price: £ 1.00   (out of stock)
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74LS257A Logic Chip

74LS257A Logic IC

Common symptoms when faulty: Blank screen, less than 38911 bytes free at startup or “garbage” screen.

Price: £ 0.85   (12 in stock)
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74LS258 Logic IC

74LS258 Logic IC

 Common symptoms when faulty: Blank screen.

Price: £ 0.75   (18 in stock)
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74LS32 Logic IC

74LS32 Logic IC

  • Logic IC for the ZX Spectrum (Quad OR gate)
Price: £ 0.75   (18 in stock)
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74LS373 Logic Chip

74LS373

Common symptoms when faulty: Screen startup has normal border, but characters are scrambled.

Price: £ 0.90   (17 in stock)
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74LS74 Logic IC

74LS74 Logic IC (U29)

Common symptoms when faulty:

  • Entire screen blank with noise pattern
  • Startup screen shows normal characters in multicolored "rainbow"
Price: £ 0.65   (25 in stock)
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PLA Chip. Type 251064-01

251064-01 (same as 906114-01) PLA Chip 

  • Removed from a socket - chip has not been soldered.
  • Tested for at least 1 hour: OK
  • A heatsink is recommended to prolong life of PLA chip if your C64 is a type without any (see mods section)
  • An alternative to this chip is the PLAnkton module (scroll down)

When replacing a C64 PLA, ideally use the same version as originally fitted. Although they are all pin-compatible and perform the same job (logically) there are small timing differences which CBM accounted for in the 64's PCB. The PLA marked 251064-01 has the same characteristics as 906114-01.

Price: £ 14.99   (out of stock)
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PLA Chip. Type 82S100N

82S100N PLA Chip 

  • Removed from a socket - has not been soldered.
  • Tested: OK

When replacing a C64 PLA, ideally use the same version as originally fitted. Although they are all pin-compatible and perform the same job (logically) there are small timing differences which CBM accounted for in the 64's PCB. The 82S100N was fitted in early C64s (similar in nature to "93459 PC")

Price: £ 14.99   (out of stock)
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PLA Chip. Type 8700-001 *Desoldered*

8700-001 PLA Chip *Desoldered*

  • Desoldered and then tested for at least 1 hour: OK
  • A heatsink is recommended to prolong life of PLA chip if your C64 is a type without any (see mods section)
  • An alternative to this chip is the PLAnkton module (scroll down)

When replacing a C64 PLA, ideally use the same version as originally fitted. Although they are all pin-compatible and perform the same job (logically) there are small timing differences which CBM accounted for in the 64's PCB. The PLA marked 8700-001 has the same characteristics as 906114-01.

Price: £ 9.99   (out of stock)
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PLA chip. Type 906114-01

906114-01 PLA Chip 

  • Removed from a socket - chip has not been soldered.
  • Tested for at least 1 hour: OK
  • A heatsink is recommended to prolong life of PLA chip if your C64 is a type without any (see mods section)
  • An alternative to this chip is the PLAnkton module (scroll down).

When replacing a C64 PLA, ideally use the same version as originally fitted. Although they are all pin-compatible and perform the same job (logically) there are small timing differences which CBM accounted for in the 64's PCB. The PLA marked 251064-01 has the same characteristics as 906114-01. Other versions of the PLA are listed below when available.

Price: £ 14.99   (out of stock)
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PLA chip. Type 906114-01 *Desoldered*

906114-01 PLA Chip *Desoldered* 

  • This item is a desoldered chip - the pins have been cleaned and straightened.
  • As the chip's legs are quite short, this chip is supplied pressed into a high quality "Turned Pin" style socket. (These sockets have sturdy pins and can in turn be pressed into a normal DIL socket, or soldered to the PCB)
  • Tested continuously for an hour: Working fine.
  • A heatsink is recommended to prolong life of PLA chip (see mods section)

When replacing a C64 PLA, ideally use the same version as originally fitted. Although they are all pin-compatible and perform the same job (logically) there are small timing differences which CBM accounted for in the 64's PCB. The PLA marked 251064-01 has the same characteristics as 906114-01. Other versions of the PLA are listed below.

Price: £ 9.99   (out of stock)
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PLA Chip. Type 93459PC

93459PC PLA Chip (used)

  • Removed from a socket - has not been soldered.
  • Tested: OK

When replacing a C64 PLA, ideally use the same version as originally fitted. Although they are all pin-compatible and perform the same job (logically) there are small timing differences which CBM accounted for in the 64's PCB. The  "93459 PC" was fitted in some early C64s (similar in nature to the "82S200N")

Price: £ 12.99   (out of stock)
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RAM upgrade kit for 16KB Spectrum (to 48K)

RAM Upgrade Kit for 16K ZX Spectrum (to 48K)

Comprises:

  • 8 x 4164 Upper RAM chips (Unused, old stock Texas Instruments brand - all tested before dispatch.)

.. brand new support logic chips for the upper RAM:

  • 2 x 74HCT157
  • 1 x 74HCT32
  • 1 x 74HCT00

.. and wire links / solder, and printed instructions.

Fitting is usually just a case of inserting the chips into the empty sockets on the motherboard and soldering a couple of wire links across the appropriate pads on the PCB. Almost all 16K models can be upgraded but there are some very early (Issue One) Spectrums that have no space on the PCB for more memory.

Price: £ 11.50   (out of stock)
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RAM upgrade kit for 16KB Spectrum (to 48K) PCB version

RAM Upgrade Kit for 16K ZX Spectrum (to 48K) PCB Version.

This version of the Spectrum RAM upgrade kit offers a cheaper, modern alternative to using individual DRAM chips. A small custom daughterboard PCB with a low power SRAM IC is simply pressed into the RAM IC sockets.

The kit also contains the 4 support logic chips which must be fitted at positions IC23-26 (IE: 2 x 74HCT157, 1 x 74HCT32 and1 x 74HCT00). A couple of wire links may also need to be soldered between the appropriate pads located on the PCB - full fitting instructions are provided.

Please check your Spectrum can be actually upgraded! Almost all 16K models can but there are some very early Spectrums that have no space on the PCB for more memory.

Click here for fitting instructions (printed version also included in kit)

If you don't require the support logic, the board is usually available on its own - see below.


Price: £ 9.99   (out of stock)
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Spectrum Upper RAM replacement board only

Upper RAM replacement board for ZX Spectrum

A PCB module designed to replace (all 8) of the 4532 ICs used for the upper 32KB of RAM in the Spectrum.

  • Suitable for Spectrum motherboard issues 2-6
  • Modern low power SRAM
  • Can be pressed into DIL sockets or soldered onto Spectrum PCB when the 4532s have been removed.
  • Click here for fitting instructions - printed version also included with board.

Please note: If you need to upgrade a 16KB machine with this board, please purchase the version with the support logic chips.

 

Price: £ 8.99   (out of stock)
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