Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_16.ADF » FEATURES/HDPROJ1
FEATURES/HDPROJ1
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/HDPROJ1 |
| Read OK: | ✔ |
| File size: | 070C bytes |
| Load address: | 4820450D |
| Exec address: | 4F525044 |
File contents
I don't know how many of you know my system but it was getting a bit power hungry, with all my add-on boards the power supply was getting so hot it was almost melting the table top. Now with the HD it was getting like spaghetti junction so I made the decision to fit the lot into a PC Mini Tower case. I spent some time tracking one down that could hold two 5.25" drives, the size of my HD, and two 3.5" floppy drives. I eventually found one in a local computer shop for 50 (mail order prices work out about the same once you add 10 post & packing), not bad price considering you get a nice looking box with a sub-frame that is designed to take both types of drive and a cool running 200W switched mode power supply (just what the ELK needed). It was a tight fit to get all the boards in to the mini tower, on reflection a midi tower case might have been a better choice affording more room to run all the ribbon cables. The boards I had to fit in other than the drives were: 1) ELK Motherboard with the Master RAM board. 2) Sloggers SP64i 3) Plus 1 with Plus 3/4, Click, 1MHz bus and Plus 6 4) Host adaptor 5) HD controller With the Elk Motherboard mounted on the side wall of the case and the Plus 1 on the bottom, I had to build a flexible adaptor to connect them together. The keyboard now being remote involved running a ribbon cable from the Elk Motherboard to a 25W "D" connector on the rear of the case and another one from this connector to the keyboard, overall the length is around 1m. This proved to be two long for reliable use so I changed the Diodes on the keyboard from silicon 1N4148 (0.7V volt drop) to Germanium OA91 (0.3V volt drop) which seems to have cured the problem. The following diagram shows how I squeezed this lot into the case.
00000000 49 20 64 6f 6e 27 74 20 6b 6e 6f 77 20 68 6f 77 |I don't know how| 00000010 20 6d 61 6e 79 20 6f 66 20 79 6f 75 20 6b 6e 6f | many of you kno| 00000020 77 20 6d 79 20 73 79 73 74 65 6d 20 62 75 74 20 |w my system but | 00000030 69 74 20 77 61 73 20 67 65 74 74 69 6e 67 20 61 |it was getting a| 00000040 20 62 69 74 20 0d 70 6f 77 65 72 20 68 75 6e 67 | bit .power hung| 00000050 72 79 2c 20 77 69 74 68 20 61 6c 6c 20 6d 79 20 |ry, with all my | 00000060 61 64 64 2d 6f 6e 20 62 6f 61 72 64 73 20 74 68 |add-on boards th| 00000070 65 20 70 6f 77 65 72 20 73 75 70 70 6c 79 20 77 |e power supply w| 00000080 61 73 20 67 65 74 74 69 6e 67 20 0d 73 6f 20 68 |as getting .so h| 00000090 6f 74 20 69 74 20 77 61 73 20 61 6c 6d 6f 73 74 |ot it was almost| 000000a0 20 6d 65 6c 74 69 6e 67 20 74 68 65 20 74 61 62 | melting the tab| 000000b0 6c 65 20 74 6f 70 2e 20 20 4e 6f 77 20 77 69 74 |le top. Now wit| 000000c0 68 20 74 68 65 20 48 44 20 69 74 20 77 61 73 20 |h the HD it was | 000000d0 0d 67 65 74 74 69 6e 67 20 6c 69 6b 65 20 73 70 |.getting like sp| 000000e0 61 67 68 65 74 74 69 20 6a 75 6e 63 74 69 6f 6e |aghetti junction| 000000f0 20 73 6f 20 49 20 6d 61 64 65 20 74 68 65 20 64 | so I made the d| 00000100 65 63 69 73 69 6f 6e 20 74 6f 20 66 69 74 20 74 |ecision to fit t| 00000110 68 65 20 6c 6f 74 20 0d 69 6e 74 6f 20 61 20 50 |he lot .into a P| 00000120 43 20 4d 69 6e 69 20 54 6f 77 65 72 20 63 61 73 |C Mini Tower cas| 00000130 65 2e 20 20 49 20 73 70 65 6e 74 20 73 6f 6d 65 |e. I spent some| 00000140 20 74 69 6d 65 20 74 72 61 63 6b 69 6e 67 20 6f | time tracking o| 00000150 6e 65 20 64 6f 77 6e 20 74 68 61 74 20 0d 63 6f |ne down that .co| 00000160 75 6c 64 20 68 6f 6c 64 20 74 77 6f 20 35 2e 32 |uld hold two 5.2| 00000170 35 22 20 64 72 69 76 65 73 2c 20 74 68 65 20 73 |5" drives, the s| 00000180 69 7a 65 20 6f 66 20 6d 79 20 48 44 2c 20 61 6e |ize of my HD, an| 00000190 64 20 74 77 6f 20 33 2e 35 22 20 66 6c 6f 70 70 |d two 3.5" flopp| 000001a0 79 20 0d 64 72 69 76 65 73 2e 20 20 49 20 65 76 |y .drives. I ev| 000001b0 65 6e 74 75 61 6c 6c 79 20 66 6f 75 6e 64 20 6f |entually found o| 000001c0 6e 65 20 69 6e 20 61 20 6c 6f 63 61 6c 20 63 6f |ne in a local co| 000001d0 6d 70 75 74 65 72 20 73 68 6f 70 20 66 6f 72 20 |mputer shop for | 000001e0 35 30 20 28 6d 61 69 6c 20 0d 6f 72 64 65 72 20 |50 (mail .order | 000001f0 70 72 69 63 65 73 20 77 6f 72 6b 20 6f 75 74 20 |prices work out | 00000200 61 62 6f 75 74 20 74 68 65 20 73 61 6d 65 20 6f |about the same o| 00000210 6e 63 65 20 79 6f 75 20 61 64 64 20 31 30 20 70 |nce you add 10 p| 00000220 6f 73 74 20 26 20 70 61 63 6b 69 6e 67 29 2c 20 |ost & packing), | 00000230 0d 6e 6f 74 20 62 61 64 20 70 72 69 63 65 20 63 |.not bad price c| 00000240 6f 6e 73 69 64 65 72 69 6e 67 20 79 6f 75 20 67 |onsidering you g| 00000250 65 74 20 61 20 6e 69 63 65 20 6c 6f 6f 6b 69 6e |et a nice lookin| 00000260 67 20 62 6f 78 20 77 69 74 68 20 61 20 73 75 62 |g box with a sub| 00000270 2d 66 72 61 6d 65 20 0d 74 68 61 74 20 69 73 20 |-frame .that is | 00000280 64 65 73 69 67 6e 65 64 20 74 6f 20 74 61 6b 65 |designed to take| 00000290 20 62 6f 74 68 20 74 79 70 65 73 20 6f 66 20 64 | both types of d| 000002a0 72 69 76 65 20 61 6e 64 20 61 20 63 6f 6f 6c 20 |rive and a cool | 000002b0 72 75 6e 6e 69 6e 67 20 32 30 30 57 20 0d 73 77 |running 200W .sw| 000002c0 69 74 63 68 65 64 20 6d 6f 64 65 20 70 6f 77 65 |itched mode powe| 000002d0 72 20 73 75 70 70 6c 79 20 28 6a 75 73 74 20 77 |r supply (just w| 000002e0 68 61 74 20 74 68 65 20 45 4c 4b 20 6e 65 65 64 |hat the ELK need| 000002f0 65 64 29 2e 20 0d 20 0d 49 74 20 77 61 73 20 61 |ed). . .It was a| 00000300 20 74 69 67 68 74 20 66 69 74 20 74 6f 20 67 65 | tight fit to ge| 00000310 74 20 61 6c 6c 20 74 68 65 20 62 6f 61 72 64 73 |t all the boards| 00000320 20 69 6e 20 74 6f 20 74 68 65 20 6d 69 6e 69 20 | in to the mini | 00000330 74 6f 77 65 72 2c 20 6f 6e 20 0d 72 65 66 6c 65 |tower, on .refle| 00000340 63 74 69 6f 6e 20 61 20 6d 69 64 69 20 74 6f 77 |ction a midi tow| 00000350 65 72 20 63 61 73 65 20 6d 69 67 68 74 20 68 61 |er case might ha| 00000360 76 65 20 62 65 65 6e 20 61 20 62 65 74 74 65 72 |ve been a better| 00000370 20 63 68 6f 69 63 65 20 61 66 66 6f 72 64 69 6e | choice affordin| 00000380 67 20 0d 6d 6f 72 65 20 72 6f 6f 6d 20 74 6f 20 |g .more room to | 00000390 72 75 6e 20 61 6c 6c 20 74 68 65 20 72 69 62 62 |run all the ribb| 000003a0 6f 6e 20 63 61 62 6c 65 73 2e 20 20 54 68 65 20 |on cables. The | 000003b0 62 6f 61 72 64 73 20 49 20 68 61 64 20 74 6f 20 |boards I had to | 000003c0 66 69 74 20 69 6e 20 0d 6f 74 68 65 72 20 74 68 |fit in .other th| 000003d0 61 6e 20 74 68 65 20 64 72 69 76 65 73 20 77 65 |an the drives we| 000003e0 72 65 3a 20 0d 20 0d 31 29 20 45 4c 4b 20 4d 6f |re: . .1) ELK Mo| 000003f0 74 68 65 72 62 6f 61 72 64 20 77 69 74 68 20 74 |therboard with t| 00000400 68 65 20 4d 61 73 74 65 72 20 52 41 4d 20 62 6f |he Master RAM bo| 00000410 61 72 64 2e 20 0d 32 29 20 53 6c 6f 67 67 65 72 |ard. .2) Slogger| 00000420 73 20 53 50 36 34 69 20 20 0d 33 29 20 50 6c 75 |s SP64i .3) Plu| 00000430 73 20 31 20 77 69 74 68 20 50 6c 75 73 20 33 2f |s 1 with Plus 3/| 00000440 34 2c 20 43 6c 69 63 6b 2c 20 31 4d 48 7a 20 62 |4, Click, 1MHz b| 00000450 75 73 20 61 6e 64 20 50 6c 75 73 20 36 20 0d 34 |us and Plus 6 .4| 00000460 29 20 48 6f 73 74 20 61 64 61 70 74 6f 72 20 0d |) Host adaptor .| 00000470 35 29 20 48 44 20 63 6f 6e 74 72 6f 6c 6c 65 72 |5) HD controller| 00000480 20 0d 20 0d 57 69 74 68 20 74 68 65 20 45 6c 6b | . .With the Elk| 00000490 20 4d 6f 74 68 65 72 62 6f 61 72 64 20 6d 6f 75 | Motherboard mou| 000004a0 6e 74 65 64 20 6f 6e 20 74 68 65 20 73 69 64 65 |nted on the side| 000004b0 20 77 61 6c 6c 20 6f 66 20 74 68 65 20 63 61 73 | wall of the cas| 000004c0 65 20 61 6e 64 20 74 68 65 20 0d 50 6c 75 73 20 |e and the .Plus | 000004d0 31 20 6f 6e 20 74 68 65 20 62 6f 74 74 6f 6d 2c |1 on the bottom,| 000004e0 20 49 20 68 61 64 20 74 6f 20 62 75 69 6c 64 20 | I had to build | 000004f0 61 20 66 6c 65 78 69 62 6c 65 20 61 64 61 70 74 |a flexible adapt| 00000500 6f 72 20 74 6f 20 63 6f 6e 6e 65 63 74 20 0d 74 |or to connect .t| 00000510 68 65 6d 20 74 6f 67 65 74 68 65 72 2e 20 20 54 |hem together. T| 00000520 68 65 20 6b 65 79 62 6f 61 72 64 20 6e 6f 77 20 |he keyboard now | 00000530 62 65 69 6e 67 20 72 65 6d 6f 74 65 20 69 6e 76 |being remote inv| 00000540 6f 6c 76 65 64 20 72 75 6e 6e 69 6e 67 20 61 20 |olved running a | 00000550 0d 72 69 62 62 6f 6e 20 63 61 62 6c 65 20 66 72 |.ribbon cable fr| 00000560 6f 6d 20 74 68 65 20 45 6c 6b 20 4d 6f 74 68 65 |om the Elk Mothe| 00000570 72 62 6f 61 72 64 20 74 6f 20 61 20 32 35 57 20 |rboard to a 25W | 00000580 22 44 22 20 63 6f 6e 6e 65 63 74 6f 72 20 6f 6e |"D" connector on| 00000590 20 74 68 65 20 0d 72 65 61 72 20 6f 66 20 74 68 | the .rear of th| 000005a0 65 20 63 61 73 65 20 61 6e 64 20 61 6e 6f 74 68 |e case and anoth| 000005b0 65 72 20 6f 6e 65 20 66 72 6f 6d 20 74 68 69 73 |er one from this| 000005c0 20 63 6f 6e 6e 65 63 74 6f 72 20 74 6f 20 74 68 | connector to th| 000005d0 65 20 6b 65 79 62 6f 61 72 64 2c 20 0d 6f 76 65 |e keyboard, .ove| 000005e0 72 61 6c 6c 20 74 68 65 20 6c 65 6e 67 74 68 20 |rall the length | 000005f0 69 73 20 61 72 6f 75 6e 64 20 31 6d 2e 20 20 54 |is around 1m. T| 00000600 68 69 73 20 70 72 6f 76 65 64 20 74 6f 20 62 65 |his proved to be| 00000610 20 74 77 6f 20 6c 6f 6e 67 20 66 6f 72 20 0d 72 | two long for .r| 00000620 65 6c 69 61 62 6c 65 20 75 73 65 20 73 6f 20 49 |eliable use so I| 00000630 20 63 68 61 6e 67 65 64 20 74 68 65 20 44 69 6f | changed the Dio| 00000640 64 65 73 20 6f 6e 20 74 68 65 20 6b 65 79 62 6f |des on the keybo| 00000650 61 72 64 20 66 72 6f 6d 20 73 69 6c 69 63 6f 6e |ard from silicon| 00000660 20 0d 31 4e 34 31 34 38 20 28 30 2e 37 56 20 76 | .1N4148 (0.7V v| 00000670 6f 6c 74 20 64 72 6f 70 29 20 74 6f 20 47 65 72 |olt drop) to Ger| 00000680 6d 61 6e 69 75 6d 20 4f 41 39 31 20 28 30 2e 33 |manium OA91 (0.3| 00000690 56 20 76 6f 6c 74 20 64 72 6f 70 29 20 77 68 69 |V volt drop) whi| 000006a0 63 68 20 73 65 65 6d 73 20 0d 74 6f 20 68 61 76 |ch seems .to hav| 000006b0 65 20 63 75 72 65 64 20 74 68 65 20 70 72 6f 62 |e cured the prob| 000006c0 6c 65 6d 2e 20 0d 20 0d 54 68 65 20 66 6f 6c 6c |lem. . .The foll| 000006d0 6f 77 69 6e 67 20 64 69 61 67 72 61 6d 20 73 68 |owing diagram sh| 000006e0 6f 77 73 20 68 6f 77 20 49 20 73 71 75 65 65 7a |ows how I squeez| 000006f0 65 64 20 74 68 69 73 20 6c 6f 74 20 69 6e 74 6f |ed this lot into| 00000700 20 74 68 65 20 63 61 73 65 2e 20 0d | the case. .| 0000070c
FEATURES/HDPROJ1.m0
FEATURES/HDPROJ1.m1
FEATURES/HDPROJ1.m2
FEATURES/HDPROJ1.m4
FEATURES/HDPROJ1.m5
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