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V/+READYM
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_56.ADF |
| Filename: | V/+READYM |
| Read OK: | ✔ |
| File size: | 0F5A bytes |
| Load address: | 56204556 |
| Exec address: | 45522B2E |
Duplicates
There are 2 duplicate copies of this file in the archive:
- AEW website » eug » eug_3_5_discs_Eug-56_A-EUG56.adf » V/+READYM
- AEW website » eug » eug_5_25_discs_Eug-56_D-EUG56.dsd » V.+READYM
- Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_56.ADF » V/+READYM
File contents
READY MADE RAMFS BOARDS
HAVING released both the RAMFS software and circuit diagrams to EUG to
build an 8M RAM disk over the past few EUG issues, anyone who still
hasn't had the nerve to built it on strip board can now order the board
ready made!
The next few paragraphs describe the board's features so if you're
not really that bothered about the ins and outs skip straight to the
bottom line...
As I hinted in the original article, you can eliminate three chips by
replacing the read buffer and write latches (74LS373 and 74LS241) with
read back latches, in particular the 74ALS990 is suitable.
By choosing surface mounted components instead of through hole DIL
parts the board size can be further reduced to just 3" by 3.5" which in-
cludes a full Megabyte of RAM. The filing system supports up to 8 Mega-
bytes and a fully decoded address signal is available on a 21 way header
should you need it.
Optional terminating resistors may be fitted if there are no other
devices plugged into the 1MHz bus, or these can be omitted and the
integral loop through connector used to "daisy chain" the other 1MHz bus
devices together.
A 1.3mm power plug supplies the board with +5v, though there are
tracks for an optional voltage regulator if some other supply (eg. +12v)
is closer to hand.
Two 32 pin sockets to use either 1x4Mbit, 1x1Mbit, 2x4Mbit or 2x1Mbit
chips depending on how much RAM is around 130mA average during RAM
accesses.
Building the board is simply a matter of placing the parts as detail-
ed in the article in this issue, though confidence with surface mount
parts is essential!
---------------------------------
The bottom line
---------------------------------
THESE boards are available now, and you'll find a photo of both my
stripboard prototype and the finished PCB online at www.sprow.co.uk/bbc
Pricing:
OPTION 1: The blank PCB, you source the components (Maplin, Farnell,
etc), you build the board as per the article on this disk, plug it in
and away you go: 18.00 GBP + 0.54 P&P
OPTION 2: The blank PCB plus all of the components, you build the board
as per the article on this disk, plug it in and away you go: 40.00 GBP
+ 0.81 P&P. With the 128k byte option, add 8.00 GBP. With the 256k byte
option, add 16.00 GBP. With the 512k byte option, add 22.00 GBP. With
the 1Mbyte option, add 44.00 GBP.
OPTION 3: The blank PCB plus the 74ALS990 latches, in case you find the
latches hard to find. You source the remaining components (Maplin, Far-
nell, etc), you build the board as per the article, plug it in and away
you go: 27.00 GBP + 0.54 GBP P&P.
OPTION 4: Buy the finished board. The option if you're not happy work-
ing with surface mount. Receive a built and tested board, plug it in
and away you go. 64.00 GBP + 0.81 GBP P&P. With the 128k byte option,
add 8.00 GBP. With the 256k byte option, add 16.00 GBP. With the 512k
byte option, add 22.00 GBP. With the 1Mbyte option, add 44.00 GBP.
Kits of parts and finished boards contain everything except the cost of
the RAM, the optional voltage regulator, and the one optional address
decoder chip.
Unfortunately the economies of scale don't really help here, so
unless someone buys about twenty of these the price will be quite high -
the PCB alone has to recoup the one off tooling charges. For most I
think the 256k option is enough (a Beeb disk only holds 200k anyway!).
Component prices are based on Farnell 'one off' prices. I'm quite
sure the resourceful among you can find parts cheaper - so feel free to
use option 3 if you think you can...
In any case, get your orders in quickety quick!
Robert Sprowson
6 Bollinbrook Road, Macclesfield, CHESHIRE SK10 3DJ
EUG #56
00000000 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000010 20 20 20 20 20 20 20 20 52 45 41 44 59 20 4d 41 | READY MA| 00000020 44 45 20 52 41 4d 46 53 20 42 4f 41 52 44 53 0d |DE RAMFS BOARDS.| 00000030 0d 48 41 56 49 4e 47 20 72 65 6c 65 61 73 65 64 |.HAVING released| 00000040 20 62 6f 74 68 20 74 68 65 20 52 41 4d 46 53 20 | both the RAMFS | 00000050 73 6f 66 74 77 61 72 65 20 61 6e 64 20 63 69 72 |software and cir| 00000060 63 75 69 74 20 64 69 61 67 72 61 6d 73 20 74 6f |cuit diagrams to| 00000070 20 45 55 47 20 74 6f 0d 62 75 69 6c 64 20 61 6e | EUG to.build an| 00000080 20 38 4d 20 52 41 4d 20 64 69 73 6b 20 6f 76 65 | 8M RAM disk ove| 00000090 72 20 74 68 65 20 70 61 73 74 20 66 65 77 20 45 |r the past few E| 000000a0 55 47 20 69 73 73 75 65 73 2c 20 61 6e 79 6f 6e |UG issues, anyon| 000000b0 65 20 77 68 6f 20 73 74 69 6c 6c 0d 68 61 73 6e |e who still.hasn| 000000c0 27 74 20 68 61 64 20 74 68 65 20 6e 65 72 76 65 |'t had the nerve| 000000d0 20 74 6f 20 62 75 69 6c 74 20 69 74 20 6f 6e 20 | to built it on | 000000e0 73 74 72 69 70 20 62 6f 61 72 64 20 63 61 6e 20 |strip board can | 000000f0 6e 6f 77 20 6f 72 64 65 72 20 74 68 65 20 62 6f |now order the bo| 00000100 61 72 64 0d 72 65 61 64 79 20 6d 61 64 65 21 0d |ard.ready made!.| 00000110 20 20 20 54 68 65 20 6e 65 78 74 20 66 65 77 20 | The next few | 00000120 70 61 72 61 67 72 61 70 68 73 20 64 65 73 63 72 |paragraphs descr| 00000130 69 62 65 20 74 68 65 20 62 6f 61 72 64 27 73 20 |ibe the board's | 00000140 66 65 61 74 75 72 65 73 20 73 6f 20 69 66 20 79 |features so if y| 00000150 6f 75 27 72 65 0d 6e 6f 74 20 72 65 61 6c 6c 79 |ou're.not really| 00000160 20 74 68 61 74 20 62 6f 74 68 65 72 65 64 20 61 | that bothered a| 00000170 62 6f 75 74 20 74 68 65 20 69 6e 73 20 61 6e 64 |bout the ins and| 00000180 20 6f 75 74 73 20 73 6b 69 70 20 73 74 72 61 69 | outs skip strai| 00000190 67 68 74 20 74 6f 20 74 68 65 20 0d 62 6f 74 74 |ght to the .bott| 000001a0 6f 6d 20 6c 69 6e 65 2e 2e 2e 0d 0d 41 73 20 49 |om line.....As I| 000001b0 20 68 69 6e 74 65 64 20 69 6e 20 74 68 65 20 6f | hinted in the o| 000001c0 72 69 67 69 6e 61 6c 20 61 72 74 69 63 6c 65 2c |riginal article,| 000001d0 20 79 6f 75 20 63 61 6e 20 65 6c 69 6d 69 6e 61 | you can elimina| 000001e0 74 65 20 74 68 72 65 65 20 63 68 69 70 73 20 62 |te three chips b| 000001f0 79 0d 72 65 70 6c 61 63 69 6e 67 20 74 68 65 20 |y.replacing the | 00000200 72 65 61 64 20 62 75 66 66 65 72 20 61 6e 64 20 |read buffer and | 00000210 77 72 69 74 65 20 6c 61 74 63 68 65 73 20 28 37 |write latches (7| 00000220 34 4c 53 33 37 33 20 61 6e 64 20 37 34 4c 53 32 |4LS373 and 74LS2| 00000230 34 31 29 20 77 69 74 68 0d 72 65 61 64 20 62 61 |41) with.read ba| 00000240 63 6b 20 6c 61 74 63 68 65 73 2c 20 69 6e 20 70 |ck latches, in p| 00000250 61 72 74 69 63 75 6c 61 72 20 74 68 65 20 37 34 |articular the 74| 00000260 41 4c 53 39 39 30 20 69 73 20 73 75 69 74 61 62 |ALS990 is suitab| 00000270 6c 65 2e 0d 20 20 20 42 79 20 63 68 6f 6f 73 69 |le.. By choosi| 00000280 6e 67 20 73 75 72 66 61 63 65 20 6d 6f 75 6e 74 |ng surface mount| 00000290 65 64 20 63 6f 6d 70 6f 6e 65 6e 74 73 20 69 6e |ed components in| 000002a0 73 74 65 61 64 20 6f 66 20 74 68 72 6f 75 67 68 |stead of through| 000002b0 20 68 6f 6c 65 20 44 49 4c 0d 70 61 72 74 73 20 | hole DIL.parts | 000002c0 74 68 65 20 62 6f 61 72 64 20 73 69 7a 65 20 63 |the board size c| 000002d0 61 6e 20 62 65 20 66 75 72 74 68 65 72 20 72 65 |an be further re| 000002e0 64 75 63 65 64 20 74 6f 20 6a 75 73 74 20 33 22 |duced to just 3"| 000002f0 20 62 79 20 33 2e 35 22 20 77 68 69 63 68 20 69 | by 3.5" which i| 00000300 6e 2d 0d 63 6c 75 64 65 73 20 61 20 66 75 6c 6c |n-.cludes a full| 00000310 20 4d 65 67 61 62 79 74 65 20 6f 66 20 52 41 4d | Megabyte of RAM| 00000320 2e 20 54 68 65 20 66 69 6c 69 6e 67 20 73 79 73 |. The filing sys| 00000330 74 65 6d 20 73 75 70 70 6f 72 74 73 20 75 70 20 |tem supports up | 00000340 74 6f 20 38 20 4d 65 67 61 2d 0d 62 79 74 65 73 |to 8 Mega-.bytes| 00000350 20 61 6e 64 20 61 20 66 75 6c 6c 79 20 64 65 63 | and a fully dec| 00000360 6f 64 65 64 20 61 64 64 72 65 73 73 20 73 69 67 |oded address sig| 00000370 6e 61 6c 20 69 73 20 61 76 61 69 6c 61 62 6c 65 |nal is available| 00000380 20 6f 6e 20 61 20 32 31 20 77 61 79 20 68 65 61 | on a 21 way hea| 00000390 64 65 72 0d 73 68 6f 75 6c 64 20 79 6f 75 20 6e |der.should you n| 000003a0 65 65 64 20 69 74 2e 0d 20 20 20 4f 70 74 69 6f |eed it.. Optio| 000003b0 6e 61 6c 20 74 65 72 6d 69 6e 61 74 69 6e 67 20 |nal terminating | 000003c0 72 65 73 69 73 74 6f 72 73 20 6d 61 79 20 62 65 |resistors may be| 000003d0 20 66 69 74 74 65 64 20 69 66 20 74 68 65 72 65 | fitted if there| 000003e0 20 61 72 65 20 6e 6f 20 6f 74 68 65 72 0d 64 65 | are no other.de| 000003f0 76 69 63 65 73 20 70 6c 75 67 67 65 64 20 69 6e |vices plugged in| 00000400 74 6f 20 74 68 65 20 31 4d 48 7a 20 62 75 73 2c |to the 1MHz bus,| 00000410 20 6f 72 20 74 68 65 73 65 20 63 61 6e 20 62 65 | or these can be| 00000420 20 6f 6d 69 74 74 65 64 20 61 6e 64 20 74 68 65 | omitted and the| 00000430 20 0d 69 6e 74 65 67 72 61 6c 20 6c 6f 6f 70 20 | .integral loop | 00000440 74 68 72 6f 75 67 68 20 63 6f 6e 6e 65 63 74 6f |through connecto| 00000450 72 20 75 73 65 64 20 74 6f 20 22 64 61 69 73 79 |r used to "daisy| 00000460 20 63 68 61 69 6e 22 20 74 68 65 20 6f 74 68 65 | chain" the othe| 00000470 72 20 31 4d 48 7a 20 62 75 73 0d 64 65 76 69 63 |r 1MHz bus.devic| 00000480 65 73 20 74 6f 67 65 74 68 65 72 2e 0d 20 20 20 |es together.. | 00000490 41 20 31 2e 33 6d 6d 20 70 6f 77 65 72 20 70 6c |A 1.3mm power pl| 000004a0 75 67 20 73 75 70 70 6c 69 65 73 20 74 68 65 20 |ug supplies the | 000004b0 62 6f 61 72 64 20 77 69 74 68 20 2b 35 76 2c 20 |board with +5v, | 000004c0 74 68 6f 75 67 68 20 74 68 65 72 65 20 61 72 65 |though there are| 000004d0 0d 74 72 61 63 6b 73 20 66 6f 72 20 61 6e 20 6f |.tracks for an o| 000004e0 70 74 69 6f 6e 61 6c 20 76 6f 6c 74 61 67 65 20 |ptional voltage | 000004f0 72 65 67 75 6c 61 74 6f 72 20 69 66 20 73 6f 6d |regulator if som| 00000500 65 20 6f 74 68 65 72 20 73 75 70 70 6c 79 20 28 |e other supply (| 00000510 65 67 2e 20 2b 31 32 76 29 0d 69 73 20 63 6c 6f |eg. +12v).is clo| 00000520 73 65 72 20 74 6f 20 68 61 6e 64 2e 0d 20 20 20 |ser to hand.. | 00000530 54 77 6f 20 33 32 20 70 69 6e 20 73 6f 63 6b 65 |Two 32 pin socke| 00000540 74 73 20 74 6f 20 75 73 65 20 65 69 74 68 65 72 |ts to use either| 00000550 20 31 78 34 4d 62 69 74 2c 20 31 78 31 4d 62 69 | 1x4Mbit, 1x1Mbi| 00000560 74 2c 20 32 78 34 4d 62 69 74 20 6f 72 20 32 78 |t, 2x4Mbit or 2x| 00000570 31 4d 62 69 74 0d 63 68 69 70 73 20 64 65 70 65 |1Mbit.chips depe| 00000580 6e 64 69 6e 67 20 6f 6e 20 68 6f 77 20 6d 75 63 |nding on how muc| 00000590 68 20 52 41 4d 20 69 73 20 61 72 6f 75 6e 64 20 |h RAM is around | 000005a0 31 33 30 6d 41 20 61 76 65 72 61 67 65 20 64 75 |130mA average du| 000005b0 72 69 6e 67 20 52 41 4d 0d 61 63 63 65 73 73 65 |ring RAM.accesse| 000005c0 73 2e 0d 20 20 20 42 75 69 6c 64 69 6e 67 20 74 |s.. Building t| 000005d0 68 65 20 62 6f 61 72 64 20 69 73 20 73 69 6d 70 |he board is simp| 000005e0 6c 79 20 61 20 6d 61 74 74 65 72 20 6f 66 20 70 |ly a matter of p| 000005f0 6c 61 63 69 6e 67 20 74 68 65 20 70 61 72 74 73 |lacing the parts| 00000600 20 61 73 20 64 65 74 61 69 6c 2d 0d 65 64 20 69 | as detail-.ed i| 00000610 6e 20 74 68 65 20 61 72 74 69 63 6c 65 20 69 6e |n the article in| 00000620 20 74 68 69 73 20 69 73 73 75 65 2c 20 74 68 6f | this issue, tho| 00000630 75 67 68 20 63 6f 6e 66 69 64 65 6e 63 65 20 77 |ugh confidence w| 00000640 69 74 68 20 73 75 72 66 61 63 65 20 6d 6f 75 6e |ith surface moun| 00000650 74 0d 70 61 72 74 73 20 69 73 20 65 73 73 65 6e |t.parts is essen| 00000660 74 69 61 6c 21 0d 0d 20 20 20 20 20 20 20 20 20 |tial!.. | 00000670 20 20 20 20 20 20 20 20 20 20 20 20 2d 2d 2d 2d | ----| 00000680 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| 00000690 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0d 20 20 |-------------. | 000006a0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000006b0 20 20 20 20 20 20 20 20 20 20 20 54 68 65 20 62 | The b| 000006c0 6f 74 74 6f 6d 20 6c 69 6e 65 0d 20 20 20 20 20 |ottom line. | 000006d0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000006e0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| * 00000700 2d 0d 0d 54 48 45 53 45 20 62 6f 61 72 64 73 20 |-..THESE boards | 00000710 61 72 65 20 61 76 61 69 6c 61 62 6c 65 20 6e 6f |are available no| 00000720 77 2c 20 61 6e 64 20 79 6f 75 27 6c 6c 20 66 69 |w, and you'll fi| 00000730 6e 64 20 61 20 70 68 6f 74 6f 20 6f 66 20 62 6f |nd a photo of bo| 00000740 74 68 20 6d 79 20 0d 73 74 72 69 70 62 6f 61 72 |th my .stripboar| 00000750 64 20 70 72 6f 74 6f 74 79 70 65 20 61 6e 64 20 |d prototype and | 00000760 74 68 65 20 66 69 6e 69 73 68 65 64 20 50 43 42 |the finished PCB| 00000770 20 6f 6e 6c 69 6e 65 20 61 74 20 77 77 77 2e 73 | online at www.s| 00000780 70 72 6f 77 2e 63 6f 2e 75 6b 2f 62 62 63 0d 0d |prow.co.uk/bbc..| 00000790 50 72 69 63 69 6e 67 3a 0d 4f 50 54 49 4f 4e 20 |Pricing:.OPTION | 000007a0 31 3a 20 54 68 65 20 62 6c 61 6e 6b 20 50 43 42 |1: The blank PCB| 000007b0 2c 20 79 6f 75 20 73 6f 75 72 63 65 20 74 68 65 |, you source the| 000007c0 20 63 6f 6d 70 6f 6e 65 6e 74 73 20 28 4d 61 70 | components (Map| 000007d0 6c 69 6e 2c 20 46 61 72 6e 65 6c 6c 2c 20 0d 65 |lin, Farnell, .e| 000007e0 74 63 29 2c 20 79 6f 75 20 62 75 69 6c 64 20 74 |tc), you build t| 000007f0 68 65 20 62 6f 61 72 64 20 61 73 20 70 65 72 20 |he board as per | 00000800 74 68 65 20 61 72 74 69 63 6c 65 20 6f 6e 20 74 |the article on t| 00000810 68 69 73 20 64 69 73 6b 2c 20 70 6c 75 67 20 69 |his disk, plug i| 00000820 74 20 69 6e 0d 61 6e 64 20 61 77 61 79 20 79 6f |t in.and away yo| 00000830 75 20 67 6f 3a 20 31 38 2e 30 30 20 47 42 50 20 |u go: 18.00 GBP | 00000840 2b 20 30 2e 35 34 20 50 26 50 0d 0d 4f 50 54 49 |+ 0.54 P&P..OPTI| 00000850 4f 4e 20 32 3a 20 54 68 65 20 62 6c 61 6e 6b 20 |ON 2: The blank | 00000860 50 43 42 20 70 6c 75 73 20 61 6c 6c 20 6f 66 20 |PCB plus all of | 00000870 74 68 65 20 63 6f 6d 70 6f 6e 65 6e 74 73 2c 20 |the components, | 00000880 79 6f 75 20 62 75 69 6c 64 20 74 68 65 20 62 6f |you build the bo| 00000890 61 72 64 0d 61 73 20 70 65 72 20 74 68 65 20 61 |ard.as per the a| 000008a0 72 74 69 63 6c 65 20 6f 6e 20 74 68 69 73 20 64 |rticle on this d| 000008b0 69 73 6b 2c 20 70 6c 75 67 20 69 74 20 69 6e 20 |isk, plug it in | 000008c0 61 6e 64 20 61 77 61 79 20 79 6f 75 20 67 6f 3a |and away you go:| 000008d0 20 34 30 2e 30 30 20 47 42 50 20 0d 2b 20 30 2e | 40.00 GBP .+ 0.| 000008e0 38 31 20 50 26 50 2e 20 57 69 74 68 20 74 68 65 |81 P&P. With the| 000008f0 20 31 32 38 6b 20 62 79 74 65 20 6f 70 74 69 6f | 128k byte optio| 00000900 6e 2c 20 61 64 64 20 38 2e 30 30 20 47 42 50 2e |n, add 8.00 GBP.| 00000910 20 57 69 74 68 20 74 68 65 20 32 35 36 6b 20 62 | With the 256k b| 00000920 79 74 65 0d 6f 70 74 69 6f 6e 2c 20 61 64 64 20 |yte.option, add | 00000930 31 36 2e 30 30 20 47 42 50 2e 20 57 69 74 68 20 |16.00 GBP. With | 00000940 74 68 65 20 35 31 32 6b 20 62 79 74 65 20 6f 70 |the 512k byte op| 00000950 74 69 6f 6e 2c 20 61 64 64 20 32 32 2e 30 30 20 |tion, add 22.00 | 00000960 47 42 50 2e 20 57 69 74 68 0d 74 68 65 20 31 4d |GBP. With.the 1M| 00000970 62 79 74 65 20 6f 70 74 69 6f 6e 2c 20 61 64 64 |byte option, add| 00000980 20 34 34 2e 30 30 20 47 42 50 2e 0d 0d 4f 50 54 | 44.00 GBP...OPT| 00000990 49 4f 4e 20 33 3a 20 54 68 65 20 62 6c 61 6e 6b |ION 3: The blank| 000009a0 20 50 43 42 20 70 6c 75 73 20 74 68 65 20 37 34 | PCB plus the 74| 000009b0 41 4c 53 39 39 30 20 6c 61 74 63 68 65 73 2c 20 |ALS990 latches, | 000009c0 69 6e 20 63 61 73 65 20 79 6f 75 20 66 69 6e 64 |in case you find| 000009d0 20 74 68 65 0d 6c 61 74 63 68 65 73 20 68 61 72 | the.latches har| 000009e0 64 20 74 6f 20 66 69 6e 64 2e 20 59 6f 75 20 73 |d to find. You s| 000009f0 6f 75 72 63 65 20 74 68 65 20 72 65 6d 61 69 6e |ource the remain| 00000a00 69 6e 67 20 63 6f 6d 70 6f 6e 65 6e 74 73 20 28 |ing components (| 00000a10 4d 61 70 6c 69 6e 2c 20 46 61 72 2d 0d 6e 65 6c |Maplin, Far-.nel| 00000a20 6c 2c 20 65 74 63 29 2c 20 79 6f 75 20 62 75 69 |l, etc), you bui| 00000a30 6c 64 20 74 68 65 20 62 6f 61 72 64 20 61 73 20 |ld the board as | 00000a40 70 65 72 20 74 68 65 20 61 72 74 69 63 6c 65 2c |per the article,| 00000a50 20 70 6c 75 67 20 69 74 20 69 6e 20 61 6e 64 20 | plug it in and | 00000a60 61 77 61 79 0d 79 6f 75 20 67 6f 3a 20 32 37 2e |away.you go: 27.| 00000a70 30 30 20 47 42 50 20 2b 20 30 2e 35 34 20 47 42 |00 GBP + 0.54 GB| 00000a80 50 20 50 26 50 2e 0d 0d 4f 50 54 49 4f 4e 20 34 |P P&P...OPTION 4| 00000a90 3a 20 42 75 79 20 74 68 65 20 66 69 6e 69 73 68 |: Buy the finish| 00000aa0 65 64 20 62 6f 61 72 64 2e 20 54 68 65 20 6f 70 |ed board. The op| 00000ab0 74 69 6f 6e 20 69 66 20 79 6f 75 27 72 65 20 6e |tion if you're n| 00000ac0 6f 74 20 68 61 70 70 79 20 77 6f 72 6b 2d 0d 69 |ot happy work-.i| 00000ad0 6e 67 20 77 69 74 68 20 73 75 72 66 61 63 65 20 |ng with surface | 00000ae0 6d 6f 75 6e 74 2e 20 52 65 63 65 69 76 65 20 61 |mount. Receive a| 00000af0 20 62 75 69 6c 74 20 61 6e 64 20 74 65 73 74 65 | built and teste| 00000b00 64 20 62 6f 61 72 64 2c 20 70 6c 75 67 20 69 74 |d board, plug it| 00000b10 20 69 6e 0d 61 6e 64 20 61 77 61 79 20 79 6f 75 | in.and away you| 00000b20 20 67 6f 2e 20 36 34 2e 30 30 20 47 42 50 20 2b | go. 64.00 GBP +| 00000b30 20 30 2e 38 31 20 47 42 50 20 50 26 50 2e 20 57 | 0.81 GBP P&P. W| 00000b40 69 74 68 20 74 68 65 20 31 32 38 6b 20 62 79 74 |ith the 128k byt| 00000b50 65 20 6f 70 74 69 6f 6e 2c 20 0d 61 64 64 20 38 |e option, .add 8| 00000b60 2e 30 30 20 47 42 50 2e 20 57 69 74 68 20 74 68 |.00 GBP. With th| 00000b70 65 20 32 35 36 6b 20 62 79 74 65 20 6f 70 74 69 |e 256k byte opti| 00000b80 6f 6e 2c 20 61 64 64 20 31 36 2e 30 30 20 47 42 |on, add 16.00 GB| 00000b90 50 2e 20 57 69 74 68 20 74 68 65 20 35 31 32 6b |P. With the 512k| 00000ba0 0d 62 79 74 65 20 6f 70 74 69 6f 6e 2c 20 61 64 |.byte option, ad| 00000bb0 64 20 32 32 2e 30 30 20 47 42 50 2e 20 57 69 74 |d 22.00 GBP. Wit| 00000bc0 68 20 74 68 65 20 31 4d 62 79 74 65 20 6f 70 74 |h the 1Mbyte opt| 00000bd0 69 6f 6e 2c 20 61 64 64 20 34 34 2e 30 30 20 47 |ion, add 44.00 G| 00000be0 42 50 2e 0d 0d 4b 69 74 73 20 6f 66 20 70 61 72 |BP...Kits of par| 00000bf0 74 73 20 61 6e 64 20 66 69 6e 69 73 68 65 64 20 |ts and finished | 00000c00 62 6f 61 72 64 73 20 63 6f 6e 74 61 69 6e 20 65 |boards contain e| 00000c10 76 65 72 79 74 68 69 6e 67 20 65 78 63 65 70 74 |verything except| 00000c20 20 74 68 65 20 63 6f 73 74 20 6f 66 0d 74 68 65 | the cost of.the| 00000c30 20 52 41 4d 2c 20 74 68 65 20 6f 70 74 69 6f 6e | RAM, the option| 00000c40 61 6c 20 76 6f 6c 74 61 67 65 20 72 65 67 75 6c |al voltage regul| 00000c50 61 74 6f 72 2c 20 61 6e 64 20 74 68 65 20 6f 6e |ator, and the on| 00000c60 65 20 6f 70 74 69 6f 6e 61 6c 20 61 64 64 72 65 |e optional addre| 00000c70 73 73 0d 64 65 63 6f 64 65 72 20 63 68 69 70 2e |ss.decoder chip.| 00000c80 0d 20 20 20 55 6e 66 6f 72 74 75 6e 61 74 65 6c |. Unfortunatel| 00000c90 79 20 74 68 65 20 65 63 6f 6e 6f 6d 69 65 73 20 |y the economies | 00000ca0 6f 66 20 73 63 61 6c 65 20 64 6f 6e 27 74 20 72 |of scale don't r| 00000cb0 65 61 6c 6c 79 20 68 65 6c 70 20 68 65 72 65 2c |eally help here,| 00000cc0 20 73 6f 20 0d 75 6e 6c 65 73 73 20 73 6f 6d 65 | so .unless some| 00000cd0 6f 6e 65 20 62 75 79 73 20 61 62 6f 75 74 20 74 |one buys about t| 00000ce0 77 65 6e 74 79 20 6f 66 20 74 68 65 73 65 20 74 |wenty of these t| 00000cf0 68 65 20 70 72 69 63 65 20 77 69 6c 6c 20 62 65 |he price will be| 00000d00 20 71 75 69 74 65 20 68 69 67 68 20 2d 0d 74 68 | quite high -.th| 00000d10 65 20 50 43 42 20 61 6c 6f 6e 65 20 68 61 73 20 |e PCB alone has | 00000d20 74 6f 20 72 65 63 6f 75 70 20 74 68 65 20 6f 6e |to recoup the on| 00000d30 65 20 6f 66 66 20 74 6f 6f 6c 69 6e 67 20 63 68 |e off tooling ch| 00000d40 61 72 67 65 73 2e 20 46 6f 72 20 6d 6f 73 74 20 |arges. For most | 00000d50 49 20 0d 74 68 69 6e 6b 20 74 68 65 20 32 35 36 |I .think the 256| 00000d60 6b 20 6f 70 74 69 6f 6e 20 69 73 20 65 6e 6f 75 |k option is enou| 00000d70 67 68 20 28 61 20 42 65 65 62 20 64 69 73 6b 20 |gh (a Beeb disk | 00000d80 6f 6e 6c 79 20 68 6f 6c 64 73 20 32 30 30 6b 20 |only holds 200k | 00000d90 61 6e 79 77 61 79 21 29 2e 0d 20 20 20 43 6f 6d |anyway!).. Com| 00000da0 70 6f 6e 65 6e 74 20 70 72 69 63 65 73 20 61 72 |ponent prices ar| 00000db0 65 20 62 61 73 65 64 20 6f 6e 20 46 61 72 6e 65 |e based on Farne| 00000dc0 6c 6c 20 27 6f 6e 65 20 6f 66 66 27 20 70 72 69 |ll 'one off' pri| 00000dd0 63 65 73 2e 20 49 27 6d 20 71 75 69 74 65 0d 73 |ces. I'm quite.s| 00000de0 75 72 65 20 74 68 65 20 72 65 73 6f 75 72 63 65 |ure the resource| 00000df0 66 75 6c 20 61 6d 6f 6e 67 20 79 6f 75 20 63 61 |ful among you ca| 00000e00 6e 20 66 69 6e 64 20 70 61 72 74 73 20 63 68 65 |n find parts che| 00000e10 61 70 65 72 20 2d 20 73 6f 20 66 65 65 6c 20 66 |aper - so feel f| 00000e20 72 65 65 20 74 6f 0d 75 73 65 20 6f 70 74 69 6f |ree to.use optio| 00000e30 6e 20 33 20 69 66 20 79 6f 75 20 74 68 69 6e 6b |n 3 if you think| 00000e40 20 79 6f 75 20 63 61 6e 2e 2e 2e 0d 20 20 20 49 | you can.... I| 00000e50 6e 20 61 6e 79 20 63 61 73 65 2c 20 67 65 74 20 |n any case, get | 00000e60 79 6f 75 72 20 6f 72 64 65 72 73 20 69 6e 20 71 |your orders in q| 00000e70 75 69 63 6b 65 74 79 20 71 75 69 63 6b 21 0d 20 |uickety quick!. | 00000e80 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000eb0 20 20 20 20 20 20 20 20 52 6f 62 65 72 74 20 53 | Robert S| 00000ec0 70 72 6f 77 73 6f 6e 0d 20 20 20 20 20 20 20 20 |prowson. | 00000ed0 20 20 20 20 20 20 20 20 20 20 20 20 20 36 20 42 | 6 B| 00000ee0 6f 6c 6c 69 6e 62 72 6f 6f 6b 20 52 6f 61 64 2c |ollinbrook Road,| 00000ef0 20 4d 61 63 63 6c 65 73 66 69 65 6c 64 2c 20 43 | Macclesfield, C| 00000f00 48 45 53 48 49 52 45 20 53 4b 31 30 20 33 44 4a |HESHIRE SK10 3DJ| 00000f10 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |. | 00000f20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000f50 20 20 45 55 47 20 23 35 36 0d | EUG #56.| 00000f5a
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