Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_16.ADF » FEATURES/HDPROJ0
FEATURES/HDPROJ0
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_16.ADF |
| Filename: | FEATURES/HDPROJ0 |
| Read OK: | ✔ |
| File size: | 0D31 bytes |
| Load address: | 4820450D |
| Exec address: | 4F525044 |
File contents
MEGA BYTES ON A KILO BYTE MACHINE
*********************************
By D. Walker
************
My project for this summer was to attach a Winchester Drive (Hard Disc
(HD)) to my Electron. Over the last year or so I have been collecting
the hardware and software required and a couple of weeks ago I found
the last piece in the jigsaw.
The major components involved in the project were:
The Hard Disc Drive - I used a Maxtor 15 head/1023 cylinder drive with
a ST506 interface. The format used by ADFS is that each cylinder has
32 sectors each containing 256 bytes: 256 x 32 x 1023 x 15 =
125,706,240 bytes.
The Hard Disc Controller - I used a OMT5200 controller. This card
carries out all the disc housekeeping and has two interfaces - a SCSI
(Small Computer Systems Interface - pronounced skuzzy) and a ST412/506
interface. The block diagram shows how everything is linked together.
The Host Adaptor - This part I had to build myself. I had obtained a
copy of the Acorn Host Adaptor circuit diagram and had started to
build the circuit on Vero board but it turned out to great a task. I
eventually contacted a member of a BBC user group who helped me obtain
a circuit board, this made life a lot easier.
The 1MHz bus - I used the low cost bus from Pres, this had to be
modified by removing the data buffer chip and wiring through the NPGFC
signal from the cartridge slot connector to the 1Mhz bus connector.
Pres Plus 3 ADFS - I have Pres's Plus 3 cartridge disc interface which
uses their own version of Acorns ADFS - v1.10, this software doesn't
have the necessary patches to talk to the HD so I had to obtain a copy
of Acorns original Electron ADFS ROM v1.0. The AFDS ROM has to be
fitted to the highest priority socket available.
Extra cartridge slot - My plus 1 cartridge slots are full with the
Disc Interface and Slogger "Click" cartridge so I had to wire up a
third slot to the Plus 1 for the 1MHz bus. Luckily the 1MHz bus
doesn't involve any ROM decoding so it was a simple case of
paralleling up to one of the existing slots.
WARNING - The Acorn Plus 1 expansion ROM socket is wired for a MAXIMUM
ROM size of 8K - this is fine if you are using the original ROM or
Sloggers Expansion ROM but the Pres AP2 is a 16K ROM and fails to be
recognised in the Plus 1 - The modification to make the socket 16K is
fairly simple but involves a lot of soldering. The Socket has to be
removed, then the 5V tracks have to be cut on both sides of pin 26, a
wire link has to inserted to loop round the cut tracks at pin 26,
re-solder the socket in place and finally link address "A13" from the
underside of the cartridge slot to pin 26.
And lastly a Power supply - I used on old IBM supply. They come with
Page 1
built in off/on switch and all the connectors to connect to the drive,
the controller card and the host adaptor.
A heck of a lot of interfaces isn't it? but it isn't as complicated
as it sounds. Of course if you can pick up a BBC hard drive then all
that is needed is the 1MHz bus which would make life a bit easier.
The connecting together of all the interfaces is by the use ribbon
cable and press connectors (IDC) all available from Maplin
Electronics.
00000000 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000010 4d 45 47 41 20 42 59 54 45 53 20 4f 4e 20 41 20 |MEGA BYTES ON A | 00000020 4b 49 4c 4f 20 42 59 54 45 20 4d 41 43 48 49 4e |KILO BYTE MACHIN| 00000030 45 20 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 |E . | 00000040 20 20 20 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a | *************| 00000050 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************| 00000060 2a 2a 2a 2a 20 0d 20 0d 20 20 20 20 20 20 20 20 |**** . . | 00000070 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000080 20 42 79 20 44 2e 20 57 61 6c 6b 65 72 20 0d 20 | By D. Walker . | 00000090 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000000a0 20 20 20 20 20 20 20 20 2a 2a 2a 2a 2a 2a 2a 2a | ********| 000000b0 2a 2a 2a 2a 20 0d 20 0d 20 0d 4d 79 20 70 72 6f |**** . . .My pro| 000000c0 6a 65 63 74 20 66 6f 72 20 74 68 69 73 20 73 75 |ject for this su| 000000d0 6d 6d 65 72 20 77 61 73 20 74 6f 20 61 74 74 61 |mmer was to atta| 000000e0 63 68 20 61 20 57 69 6e 63 68 65 73 74 65 72 20 |ch a Winchester | 000000f0 44 72 69 76 65 20 28 48 61 72 64 20 44 69 73 63 |Drive (Hard Disc| 00000100 20 0d 28 48 44 29 29 20 74 6f 20 6d 79 20 45 6c | .(HD)) to my El| 00000110 65 63 74 72 6f 6e 2e 20 20 4f 76 65 72 20 74 68 |ectron. Over th| 00000120 65 20 6c 61 73 74 20 79 65 61 72 20 6f 72 20 73 |e last year or s| 00000130 6f 20 49 20 68 61 76 65 20 62 65 65 6e 20 63 6f |o I have been co| 00000140 6c 6c 65 63 74 69 6e 67 20 0d 74 68 65 20 68 61 |llecting .the ha| 00000150 72 64 77 61 72 65 20 61 6e 64 20 73 6f 66 74 77 |rdware and softw| 00000160 61 72 65 20 72 65 71 75 69 72 65 64 20 61 6e 64 |are required and| 00000170 20 61 20 63 6f 75 70 6c 65 20 6f 66 20 77 65 65 | a couple of wee| 00000180 6b 73 20 61 67 6f 20 49 20 66 6f 75 6e 64 20 0d |ks ago I found .| 00000190 74 68 65 20 6c 61 73 74 20 70 69 65 63 65 20 69 |the last piece i| 000001a0 6e 20 74 68 65 20 6a 69 67 73 61 77 2e 20 0d 20 |n the jigsaw. . | 000001b0 0d 54 68 65 20 6d 61 6a 6f 72 20 63 6f 6d 70 6f |.The major compo| 000001c0 6e 65 6e 74 73 20 69 6e 76 6f 6c 76 65 64 20 69 |nents involved i| 000001d0 6e 20 74 68 65 20 70 72 6f 6a 65 63 74 20 77 65 |n the project we| 000001e0 72 65 3a 20 0d 20 0d 54 68 65 20 48 61 72 64 20 |re: . .The Hard | 000001f0 44 69 73 63 20 44 72 69 76 65 20 2d 20 49 20 75 |Disc Drive - I u| 00000200 73 65 64 20 61 20 4d 61 78 74 6f 72 20 31 35 20 |sed a Maxtor 15 | 00000210 68 65 61 64 2f 31 30 32 33 20 63 79 6c 69 6e 64 |head/1023 cylind| 00000220 65 72 20 64 72 69 76 65 20 77 69 74 68 20 0d 61 |er drive with .a| 00000230 20 53 54 35 30 36 20 69 6e 74 65 72 66 61 63 65 | ST506 interface| 00000240 2e 20 20 54 68 65 20 66 6f 72 6d 61 74 20 75 73 |. The format us| 00000250 65 64 20 62 79 20 41 44 46 53 20 69 73 20 74 68 |ed by ADFS is th| 00000260 61 74 20 65 61 63 68 20 63 79 6c 69 6e 64 65 72 |at each cylinder| 00000270 20 68 61 73 20 0d 33 32 20 73 65 63 74 6f 72 73 | has .32 sectors| 00000280 20 65 61 63 68 20 63 6f 6e 74 61 69 6e 69 6e 67 | each containing| 00000290 20 32 35 36 20 62 79 74 65 73 3a 20 32 35 36 20 | 256 bytes: 256 | 000002a0 78 20 33 32 20 78 20 31 30 32 33 20 78 20 31 35 |x 32 x 1023 x 15| 000002b0 20 3d 20 0d 31 32 35 2c 37 30 36 2c 32 34 30 20 | = .125,706,240 | 000002c0 62 79 74 65 73 2e 20 0d 20 0d 54 68 65 20 48 61 |bytes. . .The Ha| 000002d0 72 64 20 44 69 73 63 20 43 6f 6e 74 72 6f 6c 6c |rd Disc Controll| 000002e0 65 72 20 2d 20 49 20 75 73 65 64 20 61 20 4f 4d |er - I used a OM| 000002f0 54 35 32 30 30 20 63 6f 6e 74 72 6f 6c 6c 65 72 |T5200 controller| 00000300 2e 20 20 54 68 69 73 20 63 61 72 64 20 0d 63 61 |. This card .ca| 00000310 72 72 69 65 73 20 6f 75 74 20 61 6c 6c 20 74 68 |rries out all th| 00000320 65 20 64 69 73 63 20 68 6f 75 73 65 6b 65 65 70 |e disc housekeep| 00000330 69 6e 67 20 61 6e 64 20 68 61 73 20 74 77 6f 20 |ing and has two | 00000340 69 6e 74 65 72 66 61 63 65 73 20 2d 20 61 20 53 |interfaces - a S| 00000350 43 53 49 20 0d 28 53 6d 61 6c 6c 20 43 6f 6d 70 |CSI .(Small Comp| 00000360 75 74 65 72 20 53 79 73 74 65 6d 73 20 49 6e 74 |uter Systems Int| 00000370 65 72 66 61 63 65 20 2d 20 70 72 6f 6e 6f 75 6e |erface - pronoun| 00000380 63 65 64 20 73 6b 75 7a 7a 79 29 20 61 6e 64 20 |ced skuzzy) and | 00000390 61 20 53 54 34 31 32 2f 35 30 36 20 0d 69 6e 74 |a ST412/506 .int| 000003a0 65 72 66 61 63 65 2e 20 20 54 68 65 20 62 6c 6f |erface. The blo| 000003b0 63 6b 20 64 69 61 67 72 61 6d 20 73 68 6f 77 73 |ck diagram shows| 000003c0 20 68 6f 77 20 65 76 65 72 79 74 68 69 6e 67 20 | how everything | 000003d0 69 73 20 6c 69 6e 6b 65 64 20 74 6f 67 65 74 68 |is linked togeth| 000003e0 65 72 2e 20 0d 20 0d 54 68 65 20 48 6f 73 74 20 |er. . .The Host | 000003f0 41 64 61 70 74 6f 72 20 2d 20 54 68 69 73 20 70 |Adaptor - This p| 00000400 61 72 74 20 49 20 68 61 64 20 74 6f 20 62 75 69 |art I had to bui| 00000410 6c 64 20 6d 79 73 65 6c 66 2e 20 20 49 20 68 61 |ld myself. I ha| 00000420 64 20 6f 62 74 61 69 6e 65 64 20 61 20 0d 63 6f |d obtained a .co| 00000430 70 79 20 6f 66 20 74 68 65 20 41 63 6f 72 6e 20 |py of the Acorn | 00000440 48 6f 73 74 20 41 64 61 70 74 6f 72 20 63 69 72 |Host Adaptor cir| 00000450 63 75 69 74 20 64 69 61 67 72 61 6d 20 61 6e 64 |cuit diagram and| 00000460 20 68 61 64 20 73 74 61 72 74 65 64 20 74 6f 20 | had started to | 00000470 0d 62 75 69 6c 64 20 74 68 65 20 63 69 72 63 75 |.build the circu| 00000480 69 74 20 6f 6e 20 56 65 72 6f 20 62 6f 61 72 64 |it on Vero board| 00000490 20 62 75 74 20 69 74 20 74 75 72 6e 65 64 20 6f | but it turned o| 000004a0 75 74 20 74 6f 20 67 72 65 61 74 20 61 20 74 61 |ut to great a ta| 000004b0 73 6b 2e 20 20 49 20 0d 65 76 65 6e 74 75 61 6c |sk. I .eventual| 000004c0 6c 79 20 63 6f 6e 74 61 63 74 65 64 20 61 20 6d |ly contacted a m| 000004d0 65 6d 62 65 72 20 6f 66 20 61 20 42 42 43 20 75 |ember of a BBC u| 000004e0 73 65 72 20 67 72 6f 75 70 20 77 68 6f 20 68 65 |ser group who he| 000004f0 6c 70 65 64 20 6d 65 20 6f 62 74 61 69 6e 20 0d |lped me obtain .| 00000500 61 20 63 69 72 63 75 69 74 20 62 6f 61 72 64 2c |a circuit board,| 00000510 20 74 68 69 73 20 6d 61 64 65 20 6c 69 66 65 20 | this made life | 00000520 61 20 6c 6f 74 20 65 61 73 69 65 72 2e 20 20 0d |a lot easier. .| 00000530 20 0d 54 68 65 20 31 4d 48 7a 20 62 75 73 20 2d | .The 1MHz bus -| 00000540 20 49 20 75 73 65 64 20 74 68 65 20 6c 6f 77 20 | I used the low | 00000550 63 6f 73 74 20 62 75 73 20 66 72 6f 6d 20 50 72 |cost bus from Pr| 00000560 65 73 2c 20 74 68 69 73 20 68 61 64 20 74 6f 20 |es, this had to | 00000570 62 65 20 0d 6d 6f 64 69 66 69 65 64 20 62 79 20 |be .modified by | 00000580 72 65 6d 6f 76 69 6e 67 20 74 68 65 20 64 61 74 |removing the dat| 00000590 61 20 62 75 66 66 65 72 20 63 68 69 70 20 61 6e |a buffer chip an| 000005a0 64 20 77 69 72 69 6e 67 20 74 68 72 6f 75 67 68 |d wiring through| 000005b0 20 74 68 65 20 4e 50 47 46 43 20 0d 73 69 67 6e | the NPGFC .sign| 000005c0 61 6c 20 66 72 6f 6d 20 74 68 65 20 63 61 72 74 |al from the cart| 000005d0 72 69 64 67 65 20 73 6c 6f 74 20 63 6f 6e 6e 65 |ridge slot conne| 000005e0 63 74 6f 72 20 74 6f 20 74 68 65 20 31 4d 68 7a |ctor to the 1Mhz| 000005f0 20 62 75 73 20 63 6f 6e 6e 65 63 74 6f 72 2e 20 | bus connector. | 00000600 20 0d 20 0d 50 72 65 73 20 50 6c 75 73 20 33 20 | . .Pres Plus 3 | 00000610 41 44 46 53 20 2d 20 49 20 68 61 76 65 20 50 72 |ADFS - I have Pr| 00000620 65 73 27 73 20 50 6c 75 73 20 33 20 63 61 72 74 |es's Plus 3 cart| 00000630 72 69 64 67 65 20 64 69 73 63 20 69 6e 74 65 72 |ridge disc inter| 00000640 66 61 63 65 20 77 68 69 63 68 20 0d 75 73 65 73 |face which .uses| 00000650 20 74 68 65 69 72 20 6f 77 6e 20 76 65 72 73 69 | their own versi| 00000660 6f 6e 20 6f 66 20 41 63 6f 72 6e 73 20 41 44 46 |on of Acorns ADF| 00000670 53 20 2d 20 76 31 2e 31 30 2c 20 74 68 69 73 20 |S - v1.10, this | 00000680 73 6f 66 74 77 61 72 65 20 64 6f 65 73 6e 27 74 |software doesn't| 00000690 20 0d 68 61 76 65 20 74 68 65 20 6e 65 63 65 73 | .have the neces| 000006a0 73 61 72 79 20 70 61 74 63 68 65 73 20 74 6f 20 |sary patches to | 000006b0 74 61 6c 6b 20 74 6f 20 74 68 65 20 48 44 20 73 |talk to the HD s| 000006c0 6f 20 49 20 68 61 64 20 74 6f 20 6f 62 74 61 69 |o I had to obtai| 000006d0 6e 20 61 20 63 6f 70 79 20 0d 6f 66 20 41 63 6f |n a copy .of Aco| 000006e0 72 6e 73 20 6f 72 69 67 69 6e 61 6c 20 45 6c 65 |rns original Ele| 000006f0 63 74 72 6f 6e 20 41 44 46 53 20 52 4f 4d 20 76 |ctron ADFS ROM v| 00000700 31 2e 30 2e 20 20 54 68 65 20 41 46 44 53 20 52 |1.0. The AFDS R| 00000710 4f 4d 20 68 61 73 20 74 6f 20 62 65 20 0d 66 69 |OM has to be .fi| 00000720 74 74 65 64 20 74 6f 20 74 68 65 20 68 69 67 68 |tted to the high| 00000730 65 73 74 20 70 72 69 6f 72 69 74 79 20 73 6f 63 |est priority soc| 00000740 6b 65 74 20 61 76 61 69 6c 61 62 6c 65 2e 20 0d |ket available. .| 00000750 20 0d 45 78 74 72 61 20 63 61 72 74 72 69 64 67 | .Extra cartridg| 00000760 65 20 73 6c 6f 74 20 2d 20 4d 79 20 70 6c 75 73 |e slot - My plus| 00000770 20 31 20 63 61 72 74 72 69 64 67 65 20 73 6c 6f | 1 cartridge slo| 00000780 74 73 20 61 72 65 20 66 75 6c 6c 20 77 69 74 68 |ts are full with| 00000790 20 74 68 65 20 0d 44 69 73 63 20 49 6e 74 65 72 | the .Disc Inter| 000007a0 66 61 63 65 20 61 6e 64 20 53 6c 6f 67 67 65 72 |face and Slogger| 000007b0 20 22 43 6c 69 63 6b 22 20 63 61 72 74 72 69 64 | "Click" cartrid| 000007c0 67 65 20 73 6f 20 49 20 68 61 64 20 74 6f 20 77 |ge so I had to w| 000007d0 69 72 65 20 75 70 20 61 20 0d 74 68 69 72 64 20 |ire up a .third | 000007e0 73 6c 6f 74 20 74 6f 20 74 68 65 20 50 6c 75 73 |slot to the Plus| 000007f0 20 31 20 66 6f 72 20 74 68 65 20 31 4d 48 7a 20 | 1 for the 1MHz | 00000800 62 75 73 2e 20 20 4c 75 63 6b 69 6c 79 20 74 68 |bus. Luckily th| 00000810 65 20 31 4d 48 7a 20 62 75 73 20 0d 64 6f 65 73 |e 1MHz bus .does| 00000820 6e 27 74 20 69 6e 76 6f 6c 76 65 20 61 6e 79 20 |n't involve any | 00000830 52 4f 4d 20 64 65 63 6f 64 69 6e 67 20 73 6f 20 |ROM decoding so | 00000840 69 74 20 77 61 73 20 61 20 73 69 6d 70 6c 65 20 |it was a simple | 00000850 63 61 73 65 20 6f 66 20 0d 70 61 72 61 6c 6c 65 |case of .paralle| 00000860 6c 69 6e 67 20 75 70 20 74 6f 20 6f 6e 65 20 6f |ling up to one o| 00000870 66 20 74 68 65 20 65 78 69 73 74 69 6e 67 20 73 |f the existing s| 00000880 6c 6f 74 73 2e 20 0d 20 0d 57 41 52 4e 49 4e 47 |lots. . .WARNING| 00000890 20 2d 20 54 68 65 20 41 63 6f 72 6e 20 50 6c 75 | - The Acorn Plu| 000008a0 73 20 31 20 65 78 70 61 6e 73 69 6f 6e 20 52 4f |s 1 expansion RO| 000008b0 4d 20 73 6f 63 6b 65 74 20 69 73 20 77 69 72 65 |M socket is wire| 000008c0 64 20 66 6f 72 20 61 20 4d 41 58 49 4d 55 4d 20 |d for a MAXIMUM | 000008d0 0d 52 4f 4d 20 73 69 7a 65 20 6f 66 20 38 4b 20 |.ROM size of 8K | 000008e0 2d 20 74 68 69 73 20 69 73 20 66 69 6e 65 20 69 |- this is fine i| 000008f0 66 20 79 6f 75 20 61 72 65 20 75 73 69 6e 67 20 |f you are using | 00000900 74 68 65 20 6f 72 69 67 69 6e 61 6c 20 52 4f 4d |the original ROM| 00000910 20 6f 72 20 0d 53 6c 6f 67 67 65 72 73 20 45 78 | or .Sloggers Ex| 00000920 70 61 6e 73 69 6f 6e 20 52 4f 4d 20 62 75 74 20 |pansion ROM but | 00000930 74 68 65 20 50 72 65 73 20 41 50 32 20 69 73 20 |the Pres AP2 is | 00000940 61 20 31 36 4b 20 52 4f 4d 20 61 6e 64 20 66 61 |a 16K ROM and fa| 00000950 69 6c 73 20 74 6f 20 62 65 20 0d 72 65 63 6f 67 |ils to be .recog| 00000960 6e 69 73 65 64 20 69 6e 20 74 68 65 20 50 6c 75 |nised in the Plu| 00000970 73 20 31 20 2d 20 54 68 65 20 6d 6f 64 69 66 69 |s 1 - The modifi| 00000980 63 61 74 69 6f 6e 20 74 6f 20 6d 61 6b 65 20 74 |cation to make t| 00000990 68 65 20 73 6f 63 6b 65 74 20 31 36 4b 20 69 73 |he socket 16K is| 000009a0 20 0d 66 61 69 72 6c 79 20 73 69 6d 70 6c 65 20 | .fairly simple | 000009b0 62 75 74 20 69 6e 76 6f 6c 76 65 73 20 61 20 6c |but involves a l| 000009c0 6f 74 20 6f 66 20 73 6f 6c 64 65 72 69 6e 67 2e |ot of soldering.| 000009d0 20 20 54 68 65 20 53 6f 63 6b 65 74 20 68 61 73 | The Socket has| 000009e0 20 74 6f 20 62 65 20 0d 72 65 6d 6f 76 65 64 2c | to be .removed,| 000009f0 20 74 68 65 6e 20 74 68 65 20 35 56 20 74 72 61 | then the 5V tra| 00000a00 63 6b 73 20 68 61 76 65 20 74 6f 20 62 65 20 63 |cks have to be c| 00000a10 75 74 20 6f 6e 20 62 6f 74 68 20 73 69 64 65 73 |ut on both sides| 00000a20 20 6f 66 20 70 69 6e 20 32 36 2c 20 61 20 0d 77 | of pin 26, a .w| 00000a30 69 72 65 20 6c 69 6e 6b 20 68 61 73 20 74 6f 20 |ire link has to | 00000a40 69 6e 73 65 72 74 65 64 20 74 6f 20 6c 6f 6f 70 |inserted to loop| 00000a50 20 72 6f 75 6e 64 20 74 68 65 20 63 75 74 20 74 | round the cut t| 00000a60 72 61 63 6b 73 20 61 74 20 70 69 6e 20 32 36 2c |racks at pin 26,| 00000a70 20 0d 72 65 2d 73 6f 6c 64 65 72 20 74 68 65 20 | .re-solder the | 00000a80 73 6f 63 6b 65 74 20 69 6e 20 70 6c 61 63 65 20 |socket in place | 00000a90 61 6e 64 20 66 69 6e 61 6c 6c 79 20 6c 69 6e 6b |and finally link| 00000aa0 20 61 64 64 72 65 73 73 20 22 41 31 33 22 20 66 | address "A13" f| 00000ab0 72 6f 6d 20 74 68 65 20 0d 75 6e 64 65 72 73 69 |rom the .undersi| 00000ac0 64 65 20 6f 66 20 74 68 65 20 63 61 72 74 72 69 |de of the cartri| 00000ad0 64 67 65 20 73 6c 6f 74 20 74 6f 20 70 69 6e 20 |dge slot to pin | 00000ae0 32 36 2e 20 0d 20 0d 41 6e 64 20 6c 61 73 74 6c |26. . .And lastl| 00000af0 79 20 61 20 50 6f 77 65 72 20 73 75 70 70 6c 79 |y a Power supply| 00000b00 20 2d 20 49 20 75 73 65 64 20 6f 6e 20 6f 6c 64 | - I used on old| 00000b10 20 49 42 4d 20 73 75 70 70 6c 79 2e 20 20 54 68 | IBM supply. Th| 00000b20 65 79 20 63 6f 6d 65 20 77 69 74 68 20 0d 0d 20 |ey come with .. | 00000b30 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000b50 20 20 20 50 61 67 65 20 31 0d 0d 62 75 69 6c 74 | Page 1..built| 00000b60 20 69 6e 20 6f 66 66 2f 6f 6e 20 73 77 69 74 63 | in off/on switc| 00000b70 68 20 61 6e 64 20 61 6c 6c 20 74 68 65 20 63 6f |h and all the co| 00000b80 6e 6e 65 63 74 6f 72 73 20 74 6f 20 63 6f 6e 6e |nnectors to conn| 00000b90 65 63 74 20 74 6f 20 74 68 65 20 64 72 69 76 65 |ect to the drive| 00000ba0 2c 20 0d 74 68 65 20 63 6f 6e 74 72 6f 6c 6c 65 |, .the controlle| 00000bb0 72 20 63 61 72 64 20 61 6e 64 20 74 68 65 20 68 |r card and the h| 00000bc0 6f 73 74 20 61 64 61 70 74 6f 72 2e 20 0d 20 0d |ost adaptor. . .| 00000bd0 41 20 68 65 63 6b 20 6f 66 20 61 20 6c 6f 74 20 |A heck of a lot | 00000be0 6f 66 20 69 6e 74 65 72 66 61 63 65 73 20 69 73 |of interfaces is| 00000bf0 6e 27 74 20 69 74 3f 20 20 62 75 74 20 69 74 20 |n't it? but it | 00000c00 69 73 6e 27 74 20 61 73 20 63 6f 6d 70 6c 69 63 |isn't as complic| 00000c10 61 74 65 64 20 0d 61 73 20 69 74 20 73 6f 75 6e |ated .as it soun| 00000c20 64 73 2e 20 20 4f 66 20 63 6f 75 72 73 65 20 69 |ds. Of course i| 00000c30 66 20 79 6f 75 20 63 61 6e 20 70 69 63 6b 20 75 |f you can pick u| 00000c40 70 20 61 20 42 42 43 20 68 61 72 64 20 64 72 69 |p a BBC hard dri| 00000c50 76 65 20 74 68 65 6e 20 61 6c 6c 20 0d 74 68 61 |ve then all .tha| 00000c60 74 20 69 73 20 6e 65 65 64 65 64 20 69 73 20 74 |t is needed is t| 00000c70 68 65 20 31 4d 48 7a 20 62 75 73 20 77 68 69 63 |he 1MHz bus whic| 00000c80 68 20 77 6f 75 6c 64 20 6d 61 6b 65 20 6c 69 66 |h would make lif| 00000c90 65 20 61 20 62 69 74 20 65 61 73 69 65 72 2e 20 |e a bit easier. | 00000ca0 0d 20 0d 54 68 65 20 63 6f 6e 6e 65 63 74 69 6e |. .The connectin| 00000cb0 67 20 74 6f 67 65 74 68 65 72 20 6f 66 20 61 6c |g together of al| 00000cc0 6c 20 74 68 65 20 69 6e 74 65 72 66 61 63 65 73 |l the interfaces| 00000cd0 20 69 73 20 62 79 20 74 68 65 20 75 73 65 20 72 | is by the use r| 00000ce0 69 62 62 6f 6e 20 0d 63 61 62 6c 65 20 61 6e 64 |ibbon .cable and| 00000cf0 20 70 72 65 73 73 20 63 6f 6e 6e 65 63 74 6f 72 | press connector| 00000d00 73 20 28 49 44 43 29 20 61 6c 6c 20 61 76 61 69 |s (IDC) all avai| 00000d10 6c 61 62 6c 65 20 66 72 6f 6d 20 4d 61 70 6c 69 |lable from Mapli| 00000d20 6e 20 0d 45 6c 65 63 74 72 6f 6e 69 63 73 2e 20 |n .Electronics. | 00000d30 0d |.| 00000d31
FEATURES/HDPROJ0.m0
FEATURES/HDPROJ0.m1
FEATURES/HDPROJ0.m2
FEATURES/HDPROJ0.m4
FEATURES/HDPROJ0.m5
.