ZX Spectrum +2: Difference between revisions
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{{Infobox computer | {{Infobox computer | ||
| cpu = [[Z80|Z80A]] @ 3.5469MHz | | cpu = [[Z80|Z80A]] @ 3.5469MHz | ||
| rom = | | rom = 64KB | ||
| ram = | | ram = 128KB | ||
| rampage = | | rampage = 8×16KB | ||
| manu = Amstrad | | manu = Amstrad | ||
| volume = | | volume = | ||
Line 12: | Line 10: | ||
}} | }} | ||
{{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. | |||
*''Distinguishing features: ''Fitted with radial capacitors, 2 bodge resistors and a capacitor on the rear of the PCB. | |||
*''Problems:'' | |||
**[https://www.bytedelight.com/wp-content/uploads/2021/05/ZX-Spectrum-128K-video-fixes-and-video-cables.pdf Requires TR4 mod for misplaced transistor.] | |||
** Not only should TR4 be rotated but also TR7. If TR7 is mounted in the false direction then the transistor, which normally acts as an emitter follower, only acts as a diode. The base-collector-diode together with R65 realizes the OR function. But in this case A0 is loaded by 470 Ohm which would be avoided if TR7 would be mounted correct. ([https://www.worldofspectrum.org/forums/discussion/comment/834739/#Comment_834739 Ingo]) | |||
*''Variants:'' | |||
Standard 8632 (1986 Week 32)/ 8642 (1986 week 42): Schematic [https://forum.wda-fr.org/download/file.php?id=2442&mode=viewSchematic] | |||
Mid (1987? Week 21): ROM has text rotated on it, date code 8721 [https://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'' | |||
*[https://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 [https://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 [https://www.tomdalby.com/retro/images/+2_inside.jpg] (Tom Dalby) | |||
''Serial numbers:'' | |||
*A six digit number followed by a T, e.g.: | |||
[https://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_707209003290]: | |||
*005711T: (3886) | |||
*[http://forum.wda-fr.org/viewtopic.php?t=2279012703T]: (8645?) | |||
*[https://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_707209081526]: | |||
''Photos'' | |||
*[https://cl.ly/2o3b2A1l2326/download/Z70700.zip8686] | |||
*[https://www.worldofspectrum.org/forums/discussion/comment/707209/#Comment_7072098640] | |||
===0500 (Z70500 is on the rear side)=== | |||
*''Comments:'' A later variant of the Z70500 ([https://www.worldofspectrum.org/forums/discussion/comment/823302/#Comment_823302 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. [https://www.worldofspectrum.org/forums/discussion/35523/please-test-your-zx128-2-grey-model/p1 Fixed HAL chip.] | |||
''Variants:'' | |||
*UK (1986 Week 37): [https://www.tomdalby.com/retro/images/+2_inside_i3.jpg] (Tom Dalby) | |||
*UK 8641A (1986 week 41): Amstrad 4056 instead of PCF1306P [https://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)[https://mo5.com/commun/images/ordinateurs/sinclair/F_cmspectrumplus2.jpg] (moo5) | |||
''Serial numbers:'' | |||
A six digit number proceeded by a U | |||
*U-091998: 8639 [https://www.worldofspectrum.org/forums/discussion/comment/833728/#Comment_833728] | |||
*U205749: 8641A [https://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'' | |||
*[https://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] | |||
*[https://www.worldofspectrum.org/forums/discussion/comment/833728/#Comment_833728 MatGubbins] | |||
[[Category:Spectrum]] | |||
[[Category:Hardware]] |
Latest revision as of 19:15, 26 May 2021
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.
- Distinguishing features: Fitted with radial capacitors, 2 bodge resistors and a capacitor on the rear of the PCB.
- Problems:
- Requires TR4 mod for misplaced transistor.
- Not only should TR4 be rotated but also TR7. If TR7 is mounted in the false direction then the transistor, which normally acts as an emitter follower, only acts as a diode. The base-collector-diode together with R65 realizes the OR function. But in this case A0 is loaded by 470 Ohm which would be avoided if TR7 would be mounted correct. (Ingo)
- 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 [2](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 [4] (Ben Verstee)
- 8645 (1986 Week 45): Colour of capacitors change, different diodes, changes to resistors in bottom left corner of the board [5] (Tom Dalby)
Serial numbers:
- A six digit number followed by a T, e.g.:
[6]:
Photos
0500 (Z70500 is on the rear side)
- Comments: A later variant 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:
- UK (1986 Week 37): [11] (Tom Dalby)
- UK 8641A (1986 week 41): Amstrad 4056 instead of PCF1306P [12] (nightfall crew)
- France (1986): The modulator and associated components are not fitted, French ROM (40068)[13] (moo5)
Serial numbers: A six digit number proceeded by a U
Photos