Timex Sinclair 1000 (ZX81)
Item History & Price
| Reference Number: Avaluer:51465800 | Model: Sinclair ZX81 |
| Brand: Sinclair |
This is an upgraded and working TS1000 (ZX81 Issue 3 board) that comes with a power supply, manual, three software cassettes, mic/ear lead and original polystyrene packaging.
I've made the following modifications:[1] Upgraded the RAM from 2KB to 16KB[2] Replaced the electrolytic capacitors[3] Modified the video output to composite video[4] Heat sinks on the hottest running ICs[5] Replaced the old 7805 linear regulator and heat sink with a modern switching equivalent (Traco TSR 1-245...0)[6] Replaced the original keyboard membrane with a modern one (ZX81 key legends)
I'm including an AU power supply (9VDC 1A) with a separate inline on/off switch and correctly wired plug.
Like a Datsun 120Y with a Pioneer CD stacker, the new parts are probably worth as much as the computer ... but I want these old computers to live as long as possible.
I've fully tested it and it is working fine - I was able to load 16KB software from my laptop (I've included a short help guide with some tips).
The included tape software is:[1] The Stock Option Analyser[2] The Budgeter[3] Spelling Bee
I've not tested the tapes but no doubt hours of fun to be had (smirk).
Info for those who want to tinker more: the Z80 and SRAM are socketed, the ULA and ROM are soldered in. I believe the ULA is the earlier 2C184E version (without back porch), however I've not seen any issue with the composite video output on several different LCD screens - the photos show the video output on an LCD TV and on an LCD computer monitor.
Weighs about 1kg and measures 35 x 21 x 15cm.
As this auction will finish on NYE, I won't be able to send it out until Monday Jan 4th.On 28-Dec-20 at 19:08:09 AEDST, seller added the following information:For each computer I sell I try to do three things:[1] Don't treat you like a child and exclaim "RARE!!11!!1!!!"[2] Ensure the computer is better than when it was made - replace aged parts, upgrade to modern parts, add heat sinks, etc.[3] Ensure the computer works, you can actually use it and provide an honest description - you won't see any "no cables, can't test, dunno, RARE!!11!" from me - I see no point in selling a computer that you can't power up, that you can't load software on and that you can't connect to a screen ... that's why it's sometimes months between my listings
I've made the following modifications:[1] Upgraded the RAM from 2KB to 16KB[2] Replaced the electrolytic capacitors[3] Modified the video output to composite video[4] Heat sinks on the hottest running ICs[5] Replaced the old 7805 linear regulator and heat sink with a modern switching equivalent (Traco TSR 1-245...0)[6] Replaced the original keyboard membrane with a modern one (ZX81 key legends)
I'm including an AU power supply (9VDC 1A) with a separate inline on/off switch and correctly wired plug.
Like a Datsun 120Y with a Pioneer CD stacker, the new parts are probably worth as much as the computer ... but I want these old computers to live as long as possible.
I've fully tested it and it is working fine - I was able to load 16KB software from my laptop (I've included a short help guide with some tips).
The included tape software is:[1] The Stock Option Analyser[2] The Budgeter[3] Spelling Bee
I've not tested the tapes but no doubt hours of fun to be had (smirk).
Info for those who want to tinker more: the Z80 and SRAM are socketed, the ULA and ROM are soldered in. I believe the ULA is the earlier 2C184E version (without back porch), however I've not seen any issue with the composite video output on several different LCD screens - the photos show the video output on an LCD TV and on an LCD computer monitor.
Weighs about 1kg and measures 35 x 21 x 15cm.
As this auction will finish on NYE, I won't be able to send it out until Monday Jan 4th.On 28-Dec-20 at 19:08:09 AEDST, seller added the following information:For each computer I sell I try to do three things:[1] Don't treat you like a child and exclaim "RARE!!11!!1!!!"[2] Ensure the computer is better than when it was made - replace aged parts, upgrade to modern parts, add heat sinks, etc.[3] Ensure the computer works, you can actually use it and provide an honest description - you won't see any "no cables, can't test, dunno, RARE!!11!" from me - I see no point in selling a computer that you can't power up, that you can't load software on and that you can't connect to a screen ... that's why it's sometimes months between my listings
