Summary of Contents for MICROBEE Premium Plus +
- Page 1 Premium PLUS + Construction Manual Microbee Technology Pty Ltd P.O. Box 709 Lilydale, Victoria 3140 Page 1 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
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Page 2: Table Of Contents
Core board Sockets ............ 16 Completing the Base Board .......... 17 Final checks & first power up........19 10. Bill of materials ............22 11. ‘Check photos’ ............25 Page 2 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual... -
Page 3: Introduction / Requirements
As mentioned above, the Premium Plus is a limited edition release with only 105 units being made available in total. Although we will be designing other Microbee kits in the future, we will not be re-producing the Premium case, so 105 units is the maximum number of Premium Plus machines that we can supply. - Page 4 Be very careful when you are making the cuts not to slip and cut another track. It is more controlled just to ‘take a little divot’ out of the track between the 2 vias, using the sharp Page 4 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
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Page 5: Passive Components
(unstick) them from the tape. This still leaves enough component leg left to effectively solder them into the PCB and trim them once done. Page 5 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual... - Page 6 C18 was part of the coupling into the amplifier, however, the LM386 amp was very noisy – even when there was no sound being output from the Microbee, so the LM386 circuit was replaced by a basic one- transistor speaker driver like the original Microbees had.
- Page 7 After the connectors are installed, you can refer to ‘check photo 6’ at the end of the manual and the board being assembled should look the same as the photo. Page 7 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
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Page 8: Keyboard Frame & Key Switch Assembly
If done well, you will have a decent keyboard for your Microbee that will last well. If you rush in assembling them, it is likely that you will have keys that don’t work as well as they should. - Page 9 (and hence keeping the same spacing). The following photos (on the next page) show a setup that makes the job easier & more accurate. Page 9 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
- Page 10 & needed, so the last 4 adapters in the frame trim the pins as described earlier. do not need to be assembled. Page 10 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
- Page 11 Page 11 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
- Page 12 PCB in the pads for the regulator position. Page 12 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
- Page 13 (by the multimeter), but after a small amount of time, this should be a large resistance value. As long as it is not permanently below 10 ohms, then all is well. Page 13 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
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Page 14: Sockets And Pcg Ram Adapter Pcb
Power on test The Microbee Premium Plus runs with an input power supply of 10 – 14 volts DC which is fed into the main board via the 5 pin DIN connector. 10 Volts is preferred as the regulators will run cooler. -
Page 15: Integrated Circuits
Trim any leads that are close to each other to ensure no shorts can occur. Page 15 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual... -
Page 16: Core Board Sockets
Once satisfied that everything lines up correctly, solder the rest of the pins on all 3 of the socket strips and then remove the core board. Page 16 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual... -
Page 17: Completing The Baseboard
8. Completing the Baseboard. The final steps in completing the construction of your Microbee Premium Plus baseboard involve completing the installation of the key switches, fitting the key tops, fitting the socketed components and wiring up the speaker. Installing the rest of the key switches Start from the front most row when fitting up the remaining key switches. - Page 18 IC19,20 & 21 – CY7C128A, IC53/4 - CY62256 SRAM, IC61 – 74HC139 and IC62 - the GOLD PAL Once done, the baseboard should look like the one in the following photo. Page 18 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
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Page 19: Final Checks & First Power Up
Leave the SDcard out of the socket for now – it is not needed until the after we see video output & run the in built self test diagnostics. Page 19 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual... - Page 20 The 5 pin din lead that plugs into the Microbee has 4 plugs on the other end, or 3 & a plug pack power supply. One of the other connectors on the cable is an RCA connector. This connector provides monochrome video output and can be plugged into a suitable monitor or a television that has an ‘AV’...
- Page 21 The Premium Plus should then reset itself, the RED L.E.D. should flash a number of times & after a few seconds the Microbee SHELL should appear with the list of files on the ‘disk’. If you get this far, CONGRATULATIONS, you have successfully built your very own Microbee Premium Plus! The last thing to do of course is to put the casing together.
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Page 22: Bill Of Materials
10. Bill of materials / Parts list Microbee Premium Plus Baseboard (8501-04) Bill of Materials IC's Manufacturers Part# Description Component Ref ID's Z80PIO Z80 Parallel input/output chip - DIP40 74ALS574 Octal Latch DIP20 IC32, 36, 37, 38, 39 74LS541 Unidirectional Buffer 8 bit DIP20... - Page 23 5 pin R/A PCB MNT Female DIN 25 way pin strip socket Vert MNT X2, 7 2 way pin strip socket Vert MNT X6 (pins 13 & 14) Page 23 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
- Page 24 M3 x 16mm bolt S/tap screw - Speaker mount Speaker clamp rubber feet microbee premium case badge 50ohm 50mm Speaker Microbee premium case set Premium Plus coreboard (assembled) Page 24 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
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Page 25: Check Photos
Check Photo ‘1’ – capacitors installed. Page 25 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual... - Page 26 Check Photo ‘2’ – resistors installed. Page 26 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
- Page 27 Check photo ‘3, 4 & 5’ – Close up of passive components Page 27 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
- Page 28 Check photo ‘6’ – Regulators installed with Keyboard frame Page 28 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
- Page 29 Check Photo ‘7’ – baseboard complete – no key tops installed. Page 29 of 31. Version 1.03 September 2012 Microbee Premium Plus+ | Construction Manual...
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