ZX Spectrum +2: Difference between revisions

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{{See Also|the early "Grey +2"|the later "Black +2" (+2A and +2B)|ZX Spectrum +3/2A/2B}}
{{See Also|the early "Grey +2"|the later "Black +2" (+2A and +2B)|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:
[[:http://cl.ly/image/2R2Q2G1R1x0c/Screenshot%202015-09-03%2009.17.16.png]]
*''Distinguishing features: ''Fitted with radial capacitors, 2 bodge resistors and a capacitor on the rear of the PCB.
*''Problems:''
[http://www.benophetinternet.nl/hobby/vanmezelf/ZX%20Spectrum%20128K%20video%20fixes%20and%20video%20cables.pdfRequires TR4 mod for misplaced transistor.]
*''Variants:''
Standard 8632 (1986 Week 32)/ 8642 (1986 week 42): Schematic [http://forum.wda-fr.org/download/file.php?id=2442&mode=viewSchematic]
Mid (1987? Week 21): ROM has text rotated on it, date code 8721 [[:http://rk.nvg.ntnu.no/sinclair/images/plus2_pcb.jpg]](image nvg)
''Serial numbers:''
*A six digit number proceeded by a U
*U-102726: 8632
''Photos''
*[http://cl.ly/293v1R2j370O/download/Z70500.zip8632]
===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 [[:http://benophetinternet.nl/hobby/vanmezelf/20130605_153957.jpg]] (Ben Verstee)
*8645 (1986 Week 45): Colour of capacitors change, different diodes, changes to resistors in bottom left corner of the board. [[:http://www.tomdalby.com/retro/images/+2_inside.jpg]]  (Tom Dalby)
''Serial numbers:''
*A six digit number followed by a T, e.g.:
[http://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_707209003290]:
*005711T: (3886)
[http://forum.wda-fr.org/viewtopic.php?t=2279012703T]: (8645?)
[http://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_707209081526]:
''Photos''
*[http://cl.ly/2o3b2A1l2326/download/Z70700.zip8686]
*[http://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_7072098640]
===0500 (Z70500 is on the rear side)===
*''Comments:'' A later varient of the Z70500 ([http://www.worldofspectrum.org/forums/discussion/comment/823302/#Comment_823302see 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. [http://www.worldofspectrum.org/forums/discussion/35523/please-test-your-zx128-2-grey-model/p1 Fixed HAL chip.]
''Variants:''
*UK (1986 Week 37): [[:http://www.tomdalby.com/retro/images/+2_inside_i3.jpg]] (Tom Dalby)
*UK 8641A (1986 week 41): Amstrad 4056 instead of PCF1306P [[:http://www.nightfallcrew.com/wp-content/gallery/zx-spectrum-2/img_2278.jpg]] (nightfall crew)
*France (1986): The modulator and associated components are not fitted, French ROM (40068)[[http://mo5.com/commun/images/ordinateurs/sinclair/F_cmspectrumplus2.jpg]] (moo5)
''Serial numbers:''
A six digit number proceeded by a U
*U205749: 8641A [http://www.nightfallcrew.com/22/08/2009/sinclair-amstrad-zx-spectrum-2-in-the-grey-case-issue-3sinclair-amstrad-zx-spectrum-2-grigio-issue-3/]
''Photos''
*[http://www.nightfallcrew.com/22/08/2009/sinclair-amstrad-zx-spectrum-2-in-the-grey-case-issue-3sinclair-amstrad-zx-spectrum-2-grigio-issue-3/ Nightfall crew]

Revision as of 07:00, 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:

http://cl.ly/image/2R2Q2G1R1x0c/Screenshot 2015-09-03 09.17.16.png

  • 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 [1] Mid (1987? Week 21): ROM has text rotated on it, date code 8721 http://rk.nvg.ntnu.no/sinclair/images/plus2_pcb.jpg(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:

Serial numbers:

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

[3]:

  • 005711T: (3886)

[4]: (8645?) [5]:

Photos

0500 (Z70500 is on the rear side)

  • Comments: A later varient of the Z70500 (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

  • U205749: 8641A [9]

Photos