ZX Spectrum +2
Jump to navigation
Jump to search
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:
- 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.:
[3]:
- 005711T: (3886)
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:
- 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)[[8]] (moo5)
Serial numbers: A six digit number proceeded by a U
- U205749: 8641A [9]
Photos