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F/+HINT4
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_30.ADF |
| Filename: | F/+HINT4 |
| Read OK: | ✔ |
| File size: | 0E30 bytes |
| Load address: | 2B204556 |
| Exec address: | 544E4948 |
File contents
3.1 Master 128 Memory Map
At the time of writing the memory map within the areas INFC and INFD in
the Master 128 computer are as follows:
&FCFF Paging register for memory in the &8000 to &BFFF
region.
Paging logic has to be implemented in each cartridge as necessary.
&FC82
&FC81 Speech system
&FC80 to &FCFE Reserved for use by Acorn.
3.2 Electron Memory Map
&FC18 to &FC1F Reserved for use by Acorn
&FC28 to &FC2F Reserved for Econet use
&FC30 to &FC3F Reserved for use by Acorn
&FC60 to &FC6F ACIA
&FC70 Analogue to digital converter
&FC71 Parallel printer port
&FC72 Status register
&FC73 ROM scrolling register
&FC78 to &FC7F Laser Disc
&FC80 to &FC8F Test Hardware
&FC90 to &FC9F Sound/Speech
&FCB0 to &FCBF VIA
&FCC0 to &FCCF Floppy Disc Controller
&FCE0 to &FCEF Tube
&FCFF Paged RAM register
1.0 Purpose of this application note
1 To describe the signals available on the expansion port at the rear of
the Electron microcomputer.
2 To define the specification which all expansion modules for the
Electron microcomputer must meet.
3 To describe Acorn Computers' philosophy for expansion of the Electron
microcomputer.
Note that both hardware and software must conform to the standards set out
in this note. Failure to do this will result in poor reliability, and
incompatibility with other expansion modules and the Electron itself.
Failure to comply with the power supply requirements may cause the thermal
fuse in the mains power adaptor to blow irretrievably.
1.1 Acorn Expansion Module Philosophy
The Electron is designed to take one or two expansion units fixed rigidly
to the main unit and to one another by screws which locate into recessed
brass bosses. More expansion units can be added with consequent loss of
rigidity.
Electrical connection is to the PCB edge connector at the back of the
Electron. Dimensions and specifications for the expansion connector are
given in section 2 and the Appendix.
2.0 Electron Expansion Connector
Pinout
To gain access to the Electron expansion connector, the plastic cover
which protects it must be removed. Any instructions supplied with an
expansion module must direct the user to remove this cover before
attempting to connect the module to the Electron, and to replace the cover
whenever the module is disconnected.
The Electron expansion connector is laid out as shown in Figure 1.
2.1 Signal Definitions
The function of each terminal on the Electron expansion connector is
described below.
18V AC (pins 1,2) These lines are connected directly to the output
AC RETURNS (pins 3,4) from the Electron mains power
adaptor. A total of 6W may be drawn from these
lines as long as no power is
taken from +5V (pins 9,10,49,50). For safety
reasons these lines must never
be used as an AC input to the Electron, see
Section 3.
-5V (pins 5,6) A -5V supply from the Electron. Up to 20mA
(total) may safely be drawn from this line by expansion modules.
0V (pins 7,8,47,48) Ground. Expansion modules with their own power
supply must have the 0V lines commoned with the Electron.
00000000 0d 33 2e 31 20 20 4d 61 73 74 65 72 20 31 32 38 |.3.1 Master 128| 00000010 20 4d 65 6d 6f 72 79 20 4d 61 70 0d 0d 41 74 20 | Memory Map..At | 00000020 74 68 65 20 74 69 6d 65 20 6f 66 20 77 72 69 74 |the time of writ| 00000030 69 6e 67 20 74 68 65 20 6d 65 6d 6f 72 79 20 6d |ing the memory m| 00000040 61 70 20 77 69 74 68 69 6e 20 74 68 65 20 61 72 |ap within the ar| 00000050 65 61 73 20 49 4e 46 43 20 61 6e 64 20 49 4e 46 |eas INFC and INF| 00000060 44 20 69 6e 0d 74 68 65 20 4d 61 73 74 65 72 20 |D in.the Master | 00000070 31 32 38 20 63 6f 6d 70 75 74 65 72 20 61 72 65 |128 computer are| 00000080 20 61 73 20 66 6f 6c 6c 6f 77 73 3a 0d 0d 20 20 | as follows:.. | 00000090 20 20 20 20 20 20 26 46 43 46 46 20 20 20 20 20 | &FCFF | 000000a0 20 20 20 20 20 20 50 61 67 69 6e 67 20 72 65 67 | Paging reg| 000000b0 69 73 74 65 72 20 66 6f 72 20 6d 65 6d 6f 72 79 |ister for memory| 000000c0 20 69 6e 20 74 68 65 20 26 38 30 30 30 20 74 6f | in the &8000 to| 000000d0 20 26 42 46 46 46 0d 20 20 20 20 20 20 20 20 20 | &BFFF. | 000000e0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 72 | r| 000000f0 65 67 69 6f 6e 2e 20 20 20 20 20 20 20 20 20 20 |egion. | 00000100 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000150 20 20 20 20 20 20 20 20 20 20 20 0d 20 20 20 20 | . | 00000160 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000170 20 20 20 20 20 20 20 20 20 20 20 20 20 20 0d 50 | .P| 00000180 61 67 69 6e 67 20 6c 6f 67 69 63 20 68 61 73 20 |aging logic has | 00000190 74 6f 20 62 65 20 69 6d 70 6c 65 6d 65 6e 74 65 |to be implemente| 000001a0 64 20 69 6e 20 65 61 63 68 20 63 61 72 74 72 69 |d in each cartri| 000001b0 64 67 65 20 61 73 20 6e 65 63 65 73 73 61 72 79 |dge as necessary| 000001c0 2e 0d 20 20 20 20 20 20 20 20 26 46 43 38 32 0d |.. &FC82.| 000001d0 20 20 20 20 20 20 20 20 26 46 43 38 31 20 20 20 | &FC81 | 000001e0 20 20 20 20 20 20 20 20 53 70 65 65 63 68 20 73 | Speech s| 000001f0 79 73 74 65 6d 0d 20 20 20 20 20 20 20 20 26 46 |ystem. &F| 00000200 43 38 30 20 74 6f 20 26 46 43 46 45 20 20 52 65 |C80 to &FCFE Re| 00000210 73 65 72 76 65 64 20 66 6f 72 20 75 73 65 20 62 |served for use b| 00000220 79 20 41 63 6f 72 6e 2e 0d 0d 0d 33 2e 32 20 20 |y Acorn....3.2 | 00000230 45 6c 65 63 74 72 6f 6e 20 4d 65 6d 6f 72 79 20 |Electron Memory | 00000240 4d 61 70 0d 0d 20 20 20 20 20 20 20 20 26 46 43 |Map.. &FC| 00000250 31 38 20 74 6f 20 26 46 43 31 46 20 20 52 65 73 |18 to &FC1F Res| 00000260 65 72 76 65 64 20 66 6f 72 20 75 73 65 20 62 79 |erved for use by| 00000270 20 41 63 6f 72 6e 0d 20 20 20 20 20 20 20 20 26 | Acorn. &| 00000280 46 43 32 38 20 74 6f 20 26 46 43 32 46 20 20 52 |FC28 to &FC2F R| 00000290 65 73 65 72 76 65 64 20 66 6f 72 20 45 63 6f 6e |eserved for Econ| 000002a0 65 74 20 75 73 65 0d 20 20 20 20 20 20 20 20 26 |et use. &| 000002b0 46 43 33 30 20 74 6f 20 26 46 43 33 46 20 20 52 |FC30 to &FC3F R| 000002c0 65 73 65 72 76 65 64 20 66 6f 72 20 75 73 65 20 |eserved for use | 000002d0 62 79 20 41 63 6f 72 6e 0d 20 20 20 20 20 20 20 |by Acorn. | 000002e0 20 26 46 43 36 30 20 74 6f 20 26 46 43 36 46 20 | &FC60 to &FC6F | 000002f0 20 41 43 49 41 0d 20 20 20 20 20 20 20 20 26 46 | ACIA. &F| 00000300 43 37 30 20 20 20 20 20 20 20 20 20 20 20 41 6e |C70 An| 00000310 61 6c 6f 67 75 65 20 74 6f 20 64 69 67 69 74 61 |alogue to digita| 00000320 6c 20 63 6f 6e 76 65 72 74 65 72 0d 20 20 20 20 |l converter. | 00000330 20 20 20 20 26 46 43 37 31 20 20 20 20 20 20 20 | &FC71 | 00000340 20 20 20 20 50 61 72 61 6c 6c 65 6c 20 70 72 69 | Parallel pri| 00000350 6e 74 65 72 20 70 6f 72 74 0d 20 20 20 20 20 20 |nter port. | 00000360 20 20 26 46 43 37 32 20 20 20 20 20 20 20 20 20 | &FC72 | 00000370 20 20 53 74 61 74 75 73 20 72 65 67 69 73 74 65 | Status registe| 00000380 72 0d 20 20 20 20 20 20 20 20 26 46 43 37 33 20 |r. &FC73 | 00000390 20 20 20 20 20 20 20 20 20 20 52 4f 4d 20 73 63 | ROM sc| 000003a0 72 6f 6c 6c 69 6e 67 20 72 65 67 69 73 74 65 72 |rolling register| 000003b0 0d 20 20 20 20 20 20 20 20 26 46 43 37 38 20 74 |. &FC78 t| 000003c0 6f 20 26 46 43 37 46 20 20 4c 61 73 65 72 20 44 |o &FC7F Laser D| 000003d0 69 73 63 0d 20 20 20 20 20 20 20 20 26 46 43 38 |isc. &FC8| 000003e0 30 20 74 6f 20 26 46 43 38 46 20 20 54 65 73 74 |0 to &FC8F Test| 000003f0 20 48 61 72 64 77 61 72 65 0d 20 20 20 20 20 20 | Hardware. | 00000400 20 20 26 46 43 39 30 20 74 6f 20 26 46 43 39 46 | &FC90 to &FC9F| 00000410 20 20 53 6f 75 6e 64 2f 53 70 65 65 63 68 0d 20 | Sound/Speech. | 00000420 20 20 20 20 20 20 20 26 46 43 42 30 20 74 6f 20 | &FCB0 to | 00000430 26 46 43 42 46 20 20 56 49 41 0d 20 20 20 20 20 |&FCBF VIA. | 00000440 20 20 20 26 46 43 43 30 20 74 6f 20 26 46 43 43 | &FCC0 to &FCC| 00000450 46 20 20 46 6c 6f 70 70 79 20 44 69 73 63 20 43 |F Floppy Disc C| 00000460 6f 6e 74 72 6f 6c 6c 65 72 0d 20 20 20 20 20 20 |ontroller. | 00000470 20 20 26 46 43 45 30 20 74 6f 20 26 46 43 45 46 | &FCE0 to &FCEF| 00000480 20 20 54 75 62 65 0d 20 20 20 20 20 20 20 20 26 | Tube. &| 00000490 46 43 46 46 20 20 20 20 20 20 20 20 20 20 20 50 |FCFF P| 000004a0 61 67 65 64 20 52 41 4d 20 72 65 67 69 73 74 65 |aged RAM registe| 000004b0 72 0d 0d 0d 31 2e 30 20 20 50 75 72 70 6f 73 65 |r...1.0 Purpose| 000004c0 20 6f 66 20 74 68 69 73 20 61 70 70 6c 69 63 61 | of this applica| 000004d0 74 69 6f 6e 20 6e 6f 74 65 0d 0d 31 20 20 54 6f |tion note..1 To| 000004e0 20 64 65 73 63 72 69 62 65 20 74 68 65 20 73 69 | describe the si| 000004f0 67 6e 61 6c 73 20 61 76 61 69 6c 61 62 6c 65 20 |gnals available | 00000500 6f 6e 20 74 68 65 20 65 78 70 61 6e 73 69 6f 6e |on the expansion| 00000510 20 70 6f 72 74 20 61 74 20 74 68 65 20 72 65 61 | port at the rea| 00000520 72 20 6f 66 0d 74 68 65 20 45 6c 65 63 74 72 6f |r of.the Electro| 00000530 6e 20 6d 69 63 72 6f 63 6f 6d 70 75 74 65 72 2e |n microcomputer.| 00000540 0d 0d 32 20 20 54 6f 20 64 65 66 69 6e 65 20 74 |..2 To define t| 00000550 68 65 20 73 70 65 63 69 66 69 63 61 74 69 6f 6e |he specification| 00000560 20 77 68 69 63 68 20 61 6c 6c 20 65 78 70 61 6e | which all expan| 00000570 73 69 6f 6e 20 6d 6f 64 75 6c 65 73 20 66 6f 72 |sion modules for| 00000580 20 74 68 65 0d 45 6c 65 63 74 72 6f 6e 20 6d 69 | the.Electron mi| 00000590 63 72 6f 63 6f 6d 70 75 74 65 72 20 6d 75 73 74 |crocomputer must| 000005a0 20 6d 65 65 74 2e 0d 0d 33 20 20 54 6f 20 64 65 | meet...3 To de| 000005b0 73 63 72 69 62 65 20 41 63 6f 72 6e 20 43 6f 6d |scribe Acorn Com| 000005c0 70 75 74 65 72 73 27 20 70 68 69 6c 6f 73 6f 70 |puters' philosop| 000005d0 68 79 20 66 6f 72 20 65 78 70 61 6e 73 69 6f 6e |hy for expansion| 000005e0 20 6f 66 20 74 68 65 20 45 6c 65 63 74 72 6f 6e | of the Electron| 000005f0 0d 6d 69 63 72 6f 63 6f 6d 70 75 74 65 72 2e 0d |.microcomputer..| 00000600 0d 4e 6f 74 65 20 74 68 61 74 20 62 6f 74 68 20 |.Note that both | 00000610 68 61 72 64 77 61 72 65 20 61 6e 64 20 73 6f 66 |hardware and sof| 00000620 74 77 61 72 65 20 6d 75 73 74 20 63 6f 6e 66 6f |tware must confo| 00000630 72 6d 20 74 6f 20 74 68 65 20 73 74 61 6e 64 61 |rm to the standa| 00000640 72 64 73 20 73 65 74 20 6f 75 74 0d 69 6e 20 74 |rds set out.in t| 00000650 68 69 73 20 6e 6f 74 65 2e 20 20 46 61 69 6c 75 |his note. Failu| 00000660 72 65 20 74 6f 20 64 6f 20 74 68 69 73 20 77 69 |re to do this wi| 00000670 6c 6c 20 72 65 73 75 6c 74 20 69 6e 20 70 6f 6f |ll result in poo| 00000680 72 20 72 65 6c 69 61 62 69 6c 69 74 79 2c 20 61 |r reliability, a| 00000690 6e 64 0d 69 6e 63 6f 6d 70 61 74 69 62 69 6c 69 |nd.incompatibili| 000006a0 74 79 20 77 69 74 68 20 6f 74 68 65 72 20 65 78 |ty with other ex| 000006b0 70 61 6e 73 69 6f 6e 20 6d 6f 64 75 6c 65 73 20 |pansion modules | 000006c0 61 6e 64 20 74 68 65 20 45 6c 65 63 74 72 6f 6e |and the Electron| 000006d0 20 69 74 73 65 6c 66 2e 20 0d 46 61 69 6c 75 72 | itself. .Failur| 000006e0 65 20 74 6f 20 63 6f 6d 70 6c 79 20 77 69 74 68 |e to comply with| 000006f0 20 74 68 65 20 70 6f 77 65 72 20 73 75 70 70 6c | the power suppl| 00000700 79 20 72 65 71 75 69 72 65 6d 65 6e 74 73 20 6d |y requirements m| 00000710 61 79 20 63 61 75 73 65 20 74 68 65 20 74 68 65 |ay cause the the| 00000720 72 6d 61 6c 0d 66 75 73 65 20 69 6e 20 74 68 65 |rmal.fuse in the| 00000730 20 6d 61 69 6e 73 20 70 6f 77 65 72 20 61 64 61 | mains power ada| 00000740 70 74 6f 72 20 74 6f 20 62 6c 6f 77 20 69 72 72 |ptor to blow irr| 00000750 65 74 72 69 65 76 61 62 6c 79 2e 0d 0d 0d 31 2e |etrievably....1.| 00000760 31 20 20 41 63 6f 72 6e 20 45 78 70 61 6e 73 69 |1 Acorn Expansi| 00000770 6f 6e 20 4d 6f 64 75 6c 65 20 50 68 69 6c 6f 73 |on Module Philos| 00000780 6f 70 68 79 0d 0d 54 68 65 20 45 6c 65 63 74 72 |ophy..The Electr| 00000790 6f 6e 20 69 73 20 64 65 73 69 67 6e 65 64 20 74 |on is designed t| 000007a0 6f 20 74 61 6b 65 20 6f 6e 65 20 6f 72 20 74 77 |o take one or tw| 000007b0 6f 20 65 78 70 61 6e 73 69 6f 6e 20 75 6e 69 74 |o expansion unit| 000007c0 73 20 66 69 78 65 64 20 72 69 67 69 64 6c 79 0d |s fixed rigidly.| 000007d0 74 6f 20 74 68 65 20 6d 61 69 6e 20 75 6e 69 74 |to the main unit| 000007e0 20 61 6e 64 20 74 6f 20 6f 6e 65 20 61 6e 6f 74 | and to one anot| 000007f0 68 65 72 20 62 79 20 73 63 72 65 77 73 20 77 68 |her by screws wh| 00000800 69 63 68 20 6c 6f 63 61 74 65 20 69 6e 74 6f 20 |ich locate into | 00000810 72 65 63 65 73 73 65 64 0d 62 72 61 73 73 20 62 |recessed.brass b| 00000820 6f 73 73 65 73 2e 20 20 4d 6f 72 65 20 65 78 70 |osses. More exp| 00000830 61 6e 73 69 6f 6e 20 75 6e 69 74 73 20 63 61 6e |ansion units can| 00000840 20 62 65 20 61 64 64 65 64 20 77 69 74 68 20 63 | be added with c| 00000850 6f 6e 73 65 71 75 65 6e 74 20 6c 6f 73 73 20 6f |onsequent loss o| 00000860 66 0d 72 69 67 69 64 69 74 79 2e 0d 0d 45 6c 65 |f.rigidity...Ele| 00000870 63 74 72 69 63 61 6c 20 63 6f 6e 6e 65 63 74 69 |ctrical connecti| 00000880 6f 6e 20 69 73 20 74 6f 20 74 68 65 20 50 43 42 |on is to the PCB| 00000890 20 65 64 67 65 20 63 6f 6e 6e 65 63 74 6f 72 20 | edge connector | 000008a0 61 74 20 74 68 65 20 62 61 63 6b 20 6f 66 20 74 |at the back of t| 000008b0 68 65 0d 45 6c 65 63 74 72 6f 6e 2e 20 20 44 69 |he.Electron. Di| 000008c0 6d 65 6e 73 69 6f 6e 73 20 61 6e 64 20 73 70 65 |mensions and spe| 000008d0 63 69 66 69 63 61 74 69 6f 6e 73 20 66 6f 72 20 |cifications for | 000008e0 74 68 65 20 65 78 70 61 6e 73 69 6f 6e 20 63 6f |the expansion co| 000008f0 6e 6e 65 63 74 6f 72 20 61 72 65 0d 67 69 76 65 |nnector are.give| 00000900 6e 20 69 6e 20 73 65 63 74 69 6f 6e 20 32 20 61 |n in section 2 a| 00000910 6e 64 20 74 68 65 20 41 70 70 65 6e 64 69 78 2e |nd the Appendix.| 00000920 0d 0d 0d 32 2e 30 20 20 45 6c 65 63 74 72 6f 6e |...2.0 Electron| 00000930 20 45 78 70 61 6e 73 69 6f 6e 20 43 6f 6e 6e 65 | Expansion Conne| 00000940 63 74 6f 72 0d 0d 50 69 6e 6f 75 74 0d 0d 54 6f |ctor..Pinout..To| 00000950 20 67 61 69 6e 20 61 63 63 65 73 73 20 74 6f 20 | gain access to | 00000960 74 68 65 20 45 6c 65 63 74 72 6f 6e 20 65 78 70 |the Electron exp| 00000970 61 6e 73 69 6f 6e 20 63 6f 6e 6e 65 63 74 6f 72 |ansion connector| 00000980 2c 20 74 68 65 20 70 6c 61 73 74 69 63 20 63 6f |, the plastic co| 00000990 76 65 72 0d 77 68 69 63 68 20 70 72 6f 74 65 63 |ver.which protec| 000009a0 74 73 20 69 74 20 6d 75 73 74 20 62 65 20 72 65 |ts it must be re| 000009b0 6d 6f 76 65 64 2e 20 20 41 6e 79 20 20 69 6e 73 |moved. Any ins| 000009c0 74 72 75 63 74 69 6f 6e 73 20 73 75 70 70 6c 69 |tructions suppli| 000009d0 65 64 20 77 69 74 68 20 61 6e 0d 65 78 70 61 6e |ed with an.expan| 000009e0 73 69 6f 6e 20 6d 6f 64 75 6c 65 20 6d 75 73 74 |sion module must| 000009f0 20 64 69 72 65 63 74 20 74 68 65 20 75 73 65 72 | direct the user| 00000a00 20 74 6f 20 72 65 6d 6f 76 65 20 74 68 69 73 20 | to remove this | 00000a10 63 6f 76 65 72 20 62 65 66 6f 72 65 0d 61 74 74 |cover before.att| 00000a20 65 6d 70 74 69 6e 67 20 74 6f 20 63 6f 6e 6e 65 |empting to conne| 00000a30 63 74 20 74 68 65 20 6d 6f 64 75 6c 65 20 74 6f |ct the module to| 00000a40 20 74 68 65 20 45 6c 65 63 74 72 6f 6e 2c 20 61 | the Electron, a| 00000a50 6e 64 20 74 6f 20 72 65 70 6c 61 63 65 20 74 68 |nd to replace th| 00000a60 65 20 63 6f 76 65 72 0d 77 68 65 6e 65 76 65 72 |e cover.whenever| 00000a70 20 74 68 65 20 6d 6f 64 75 6c 65 20 69 73 20 64 | the module is d| 00000a80 69 73 63 6f 6e 6e 65 63 74 65 64 2e 0d 0d 54 68 |isconnected...Th| 00000a90 65 20 45 6c 65 63 74 72 6f 6e 20 65 78 70 61 6e |e Electron expan| 00000aa0 73 69 6f 6e 20 63 6f 6e 6e 65 63 74 6f 72 20 69 |sion connector i| 00000ab0 73 20 6c 61 69 64 20 6f 75 74 20 61 73 20 73 68 |s laid out as sh| 00000ac0 6f 77 6e 20 69 6e 20 46 69 67 75 72 65 20 31 2e |own in Figure 1.| 00000ad0 20 0d 0d 0d 0d 32 2e 31 20 20 53 69 67 6e 61 6c | ....2.1 Signal| 00000ae0 20 44 65 66 69 6e 69 74 69 6f 6e 73 0d 0d 54 68 | Definitions..Th| 00000af0 65 20 66 75 6e 63 74 69 6f 6e 20 6f 66 20 65 61 |e function of ea| 00000b00 63 68 20 74 65 72 6d 69 6e 61 6c 20 6f 6e 20 74 |ch terminal on t| 00000b10 68 65 20 45 6c 65 63 74 72 6f 6e 20 65 78 70 61 |he Electron expa| 00000b20 6e 73 69 6f 6e 20 63 6f 6e 6e 65 63 74 6f 72 20 |nsion connector | 00000b30 69 73 0d 64 65 73 63 72 69 62 65 64 20 62 65 6c |is.described bel| 00000b40 6f 77 2e 0d 0d 31 38 56 20 41 43 20 28 70 69 6e |ow...18V AC (pin| 00000b50 73 20 31 2c 32 29 20 20 20 20 20 20 20 54 68 65 |s 1,2) The| 00000b60 73 65 20 6c 69 6e 65 73 20 61 72 65 20 63 6f 6e |se lines are con| 00000b70 6e 65 63 74 65 64 20 64 69 72 65 63 74 6c 79 20 |nected directly | 00000b80 74 6f 20 74 68 65 20 6f 75 74 70 75 74 0d 41 43 |to the output.AC| 00000b90 20 52 45 54 55 52 4e 53 20 28 70 69 6e 73 20 33 | RETURNS (pins 3| 00000ba0 2c 34 29 20 20 20 66 72 6f 6d 20 74 68 65 20 45 |,4) from the E| 00000bb0 6c 65 63 74 72 6f 6e 20 6d 61 69 6e 73 20 70 6f |lectron mains po| 00000bc0 77 65 72 20 0d 20 20 20 20 20 20 20 20 20 20 20 |wer . | 00000bd0 20 20 20 20 20 20 20 20 20 20 20 20 20 61 64 61 | ada| 00000be0 70 74 6f 72 2e 20 20 41 20 74 6f 74 61 6c 20 6f |ptor. A total o| 00000bf0 66 20 36 57 20 6d 61 79 20 62 65 20 64 72 61 77 |f 6W may be draw| 00000c00 6e 20 66 72 6f 6d 20 74 68 65 73 65 0d 20 20 20 |n from these. | 00000c10 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000c20 20 20 20 20 20 6c 69 6e 65 73 20 61 73 20 6c 6f | lines as lo| 00000c30 6e 67 20 61 73 20 6e 6f 20 70 6f 77 65 72 20 69 |ng as no power i| 00000c40 73 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |s. | 00000c50 20 20 20 20 20 20 20 20 20 20 74 61 6b 65 6e 20 | taken | 00000c60 66 72 6f 6d 20 2b 35 56 20 28 70 69 6e 73 20 39 |from +5V (pins 9| 00000c70 2c 31 30 2c 34 39 2c 35 30 29 2e 20 20 46 6f 72 |,10,49,50). For| 00000c80 20 73 61 66 65 74 79 0d 20 20 20 20 20 20 20 20 | safety. | 00000c90 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000ca0 72 65 61 73 6f 6e 73 20 74 68 65 73 65 20 6c 69 |reasons these li| 00000cb0 6e 65 73 20 6d 75 73 74 20 6e 65 76 65 72 0d 20 |nes must never. | 00000cc0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000cd0 20 20 20 20 20 20 20 62 65 20 75 73 65 64 20 61 | be used a| 00000ce0 73 20 61 6e 20 41 43 20 69 6e 70 75 74 20 74 6f |s an AC input to| 00000cf0 20 74 68 65 20 45 6c 65 63 74 72 6f 6e 2c 20 73 | the Electron, s| 00000d00 65 65 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 |ee. | 00000d10 20 20 20 20 20 20 20 20 20 20 20 53 65 63 74 69 | Secti| 00000d20 6f 6e 20 33 2e 0d 0d 2d 35 56 20 28 70 69 6e 73 |on 3...-5V (pins| 00000d30 20 35 2c 36 29 20 20 20 20 20 20 20 20 20 20 41 | 5,6) A| 00000d40 20 2d 35 56 20 73 75 70 70 6c 79 20 66 72 6f 6d | -5V supply from| 00000d50 20 74 68 65 20 45 6c 65 63 74 72 6f 6e 2e 20 20 | the Electron. | 00000d60 55 70 20 74 6f 20 32 30 6d 41 0d 28 74 6f 74 61 |Up to 20mA.(tota| 00000d70 6c 29 20 6d 61 79 20 73 61 66 65 6c 79 20 62 65 |l) may safely be| 00000d80 20 64 72 61 77 6e 20 66 72 6f 6d 20 74 68 69 73 | drawn from this| 00000d90 20 6c 69 6e 65 20 62 79 20 65 78 70 61 6e 73 69 | line by expansi| 00000da0 6f 6e 20 6d 6f 64 75 6c 65 73 2e 0d 0d 30 56 20 |on modules...0V | 00000db0 28 70 69 6e 73 20 37 2c 38 2c 34 37 2c 34 38 29 |(pins 7,8,47,48)| 00000dc0 20 20 20 20 20 47 72 6f 75 6e 64 2e 20 20 45 78 | Ground. Ex| 00000dd0 70 61 6e 73 69 6f 6e 20 6d 6f 64 75 6c 65 73 20 |pansion modules | 00000de0 77 69 74 68 20 74 68 65 69 72 20 6f 77 6e 20 70 |with their own p| 00000df0 6f 77 65 72 0d 73 75 70 70 6c 79 20 6d 75 73 74 |ower.supply must| 00000e00 20 68 61 76 65 20 74 68 65 20 30 56 20 6c 69 6e | have the 0V lin| 00000e10 65 73 20 63 6f 6d 6d 6f 6e 65 64 20 77 69 74 68 |es commoned with| 00000e20 20 74 68 65 20 45 6c 65 63 74 72 6f 6e 2e 0d 0d | the Electron...| 00000e30
F/+HINT4.m0
F/+HINT4.m1
F/+HINT4.m2
F/+HINT4.m4
F/+HINT4.m5
.