ZX Spectrum +2: Difference between revisions

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[http://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_707209003290]:  
[http://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_707209003290]:  
*005711T: (3886)
*005711T: (3886)
[http://forum.wda-fr.org/viewtopic.php?t=2279012703T]: (8645?)  
*[http://forum.wda-fr.org/viewtopic.php?t=2279012703T]: (8645?)  
[http://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_707209081526]:  
*[http://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_707209081526]:  


''Photos''
''Photos''

Revision as of 07:09, 17 September 2015

Infobox: ZX Spectrum +2
Manufacturer Amstrad
Mfg. volume
CPU Z80A @ 3.5469MHz
ROM 64kB
RAM 128kB
as pages 8×16kB
Gfx Res 256×192
Gfx Colours 15 (2 per 8×8 cell)
  • This article is about the early "Grey +2". For the later "Black +2" (+2A and +2B) see ZX Spectrum +3/2A/2B


Hardware Revisions

This is an attempt to pin down the various hardware revisions of the +2 Grey. There seem to be three main revisions of the PCB, within these there appear to be separate date coded batches

Z70500

  • Comments: Presumably the earliest versions of this board were created prior to the Sinclair takeover
  • Place of manufacture: These boards appear to have been manufactured in Taiwan, this is embossed on the underside of the case.
  • Date of manufacture (batch): The date code for the PCB batch is recorded on the top right corner on the rear of the PCB in the traces, in this case 32nd Week of 1986:

[1]

  • Distinguishing features: Fitted with radial capacitors, 2 bodge resistors and a capacitor on the rear of the PCB.
  • Problems:

TR4 mod for misplaced transistor.

  • Variants:

Standard 8632 (1986 Week 32)/ 8642 (1986 week 42): Schematic [2] Mid (1987? Week 21): ROM has text rotated on it, date code 8721 [3](image nvg)

Serial numbers:

  • A six digit number proceeded by a U
  • U-102726: 8632

Photos

Z70700

  • Comments: Manufactured in the UK once stocks of the toast rack PCB were used up?
  • Place of manufacture: These boards appear to have been manufactured in UK, this is embossed on the underside of the case.
  • Date of manufacture (batch): The date code for the PCB batch is recorded on the bottom left corner on the PCB in the silkscreen
  • Distinguishing features: Fitted with axial capacitors (excess stock left over from the toast rack?). Lots of small coloured stickers on the modulator and elsewhere in the case.

Variants:

  • 3886 (1986 Week 38): Bodge resistor on bottom left hand corner of the board (R86?)
  • 8640 (1986 Week 40): Colour of capacitors change [5] (Ben Verstee)
  • 8645 (1986 Week 45): Colour of capacitors change, different diodes, changes to resistors in bottom left corner of the board. [6] (Tom Dalby)

Serial numbers:

  • A six digit number followed by a T, e.g.:

[7]:

  • 005711T: (3886)
  • [8]: (8645?)
  • [9]:

Photos

0500 (Z70500 is on the rear side)

  • Comments: A later varient of the Z70500 (see also) possibly originally for the French market, but UK versions also exist.
  • Place of manufacture: Taiwan (embossed on bottom of case and PSU sticker).
  • Date of manufacture (batch): ? 8641A listed on the front bottom silkscreen of later revisions
  • Distinguishing features: Encased inductor, capacitor colour change, rear-side bodges of Z70500 corrected and paced on the front. Fixed HAL chip.

Variants:

Serial numbers: A six digit number proceeded by a U


Photos