1700TO50.TXT
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FILENAME(S): 1700TO50.TXT
FILE TYPE(S): SEQ
FILE SIZE: 2.8K
FIRST SEEN: 2025-10-20 14:31:07
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68d86891fe9243f4f441e1d83a53a51f3796f63e197674aa9cc635bc445d6a9e
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| DISK TITLE | FILENAME | FILE TYPE | COLLECTION | TRACK | SECTOR | ACTIONS |
|---|---|---|---|---|---|---|
| MASTERMMSOFT | 1700TO50.TXT | SEQ | Treasure Chest - Klaus Der Suhler | 26 | 11 | DOWNLOAD FILE |
FILE CONTENT & ANALYSIS
00000000: 54 68 69 73 20 66 69 6C 65 20 67 69 76 65 73 20 |This file gives | 00000010: 69 6E 73 74 72 75 63 74 69 6F 6E 73 20 66 6F 72 |instructions for| 00000020: 20 6D 6F 64 69 66 79 69 6E 67 20 61 20 43 6F 6D | modifying a Com| 00000030: 6D 6F 64 6F 72 65 20 31 37 30 30 20 52 45 55 20 |modore 1700 REU | 00000040: 74 6F 20 65 78 70 61 6E 64 20 0D 0A 74 68 65 20 |to expand ..the | 00000050: 6D 65 6D 6F 72 79 20 74 6F 20 35 31 32 4B 20 28 |memory to 512K (| 00000060: 65 71 75 69 76 61 6C 65 6E 74 20 74 6F 20 61 20 |equivalent to a | 00000070: 31 37 35 30 29 2E 20 20 42 65 20 61 77 61 72 65 |1750). Be aware| 00000080: 20 74 68 61 74 20 74 68 69 73 20 6D 6F 64 69 66 | that this modif| 00000090: 69 63 61 74 69 6F 6E 20 0D 0A 69 73 20 6E 6F 74 |ication ..is not| 000000A0: 20 73 75 70 70 6F 72 74 65 64 20 62 79 20 43 6F | supported by Co| 000000B0: 6D 6D 6F 64 6F 72 65 2C 20 61 6E 64 20 69 66 20 |mmodore, and if | 000000C0: 79 6F 75 20 74 72 79 20 69 74 20 79 6F 75 20 77 |you try it you w| 000000D0: 69 6C 6C 20 64 65 66 69 6E 69 74 65 6C 79 20 76 |ill definitely v| 000000E0: 6F 69 64 20 0D 0A 79 6F 75 72 20 77 61 72 72 61 |oid ..your warra| 000000F0: 6E 74 79 2E 20 20 54 68 69 73 20 69 73 20 6E 6F |nty. This is no| 00000100: 74 20 66 6F 72 20 73 6F 6D 65 6F 6E 65 20 77 68 |t for someone wh| 00000110: 6F 27 73 20 6E 65 76 65 72 20 73 6F 6C 64 65 72 |o's never solder| 00000120: 65 64 20 6F 72 20 64 65 2D 73 6F 6C 64 65 72 65 |ed or de-soldere| 00000130: 64 20 0D 0A 62 65 66 6F 72 65 2C 20 65 69 74 68 |d ..before, eith| 00000140: 65 72 2C 20 73 6F 20 62 65 20 77 61 72 6E 65 64 |er, so be warned| 00000150: 2E 20 20 59 6F 75 20 77 69 6C 6C 20 6E 65 65 64 |. You will need| 00000160: 20 31 36 20 32 35 36 4B 20 52 41 4D 20 63 68 69 | 16 256K RAM chi| 00000170: 70 73 20 28 34 31 32 36 34 29 20 61 6E 64 20 0D |ps (41264) and .| 00000180: 0A 73 6F 63 6B 65 74 73 20 66 6F 72 20 74 68 65 |.sockets for the| 00000190: 6D 2E 20 20 59 6F 75 20 73 68 6F 75 6C 64 20 75 |m. You should u| 000001A0: 73 65 20 31 32 30 6E 53 20 63 68 69 70 73 20 69 |se 120nS chips i| 000001B0: 66 20 61 74 20 61 6C 6C 20 70 6F 73 73 69 62 6C |f at all possibl| 000001C0: 65 2E 0D 0A 0D 0A 46 69 72 73 74 2C 20 66 69 6E |e.....First, fin| 000001D0: 64 20 61 20 67 6F 6F 64 2C 20 77 65 6C 6C 2D 6C |d a good, well-l| 000001E0: 69 67 68 74 65 64 20 77 6F 72 6B 73 70 61 63 65 |ighted workspace| 000001F0: 2E 20 20 54 68 69 73 20 6A 6F 62 20 74 61 6B 65 |. This job take| 00000200: 73 20 74 69 6D 65 2C 20 61 6E 64 20 79 6F 75 20 |s time, and you | 00000210: 0D 0A 77 61 6E 74 20 74 6F 20 6D 61 6B 65 20 73 |..want to make s| 00000220: 75 72 65 20 79 6F 75 20 63 61 6E 20 6C 65 61 76 |ure you can leav| 00000230: 65 20 74 68 65 20 52 45 55 20 69 6E 20 61 20 73 |e the REU in a s| 00000240: 61 66 65 20 70 6C 61 63 65 20 69 66 20 79 6F 75 |afe place if you| 00000250: 20 64 6F 6E 27 74 20 66 69 6E 69 73 68 20 0D 0A | don't finish ..| 00000260: 69 74 20 61 6C 6C 20 69 6E 20 6F 6E 65 20 73 69 |it all in one si| 00000270: 74 74 69 6E 67 2E 20 20 42 65 20 73 75 72 65 20 |tting. Be sure | 00000280: 79 6F 75 20 63 61 6E 20 67 72 6F 75 6E 64 20 79 |you can ground y| 00000290: 6F 75 72 73 65 6C 66 20 65 61 73 69 6C 79 2C 20 |ourself easily, | 000002A0: 62 65 63 61 75 73 65 20 49 43 20 0D 0A 63 68 69 |because IC ..chi| 000002B0: 70 73 20 61 72 65 20 65 78 74 72 65 6D 65 6C 79 |ps are extremely| 000002C0: 20 73 65 6E 73 69 74 69 76 65 20 74 6F 20 73 74 | sensitive to st| 000002D0: 61 74 69 63 2E 20 20 54 61 6B 65 20 61 6C 6C 20 |atic. Take all | 000002E0: 70 6F 73 73 69 62 6C 65 20 70 72 65 63 61 75 74 |possible precaut| 000002F0: 69 6F 6E 73 20 0D 0A 61 67 61 69 6E 73 74 20 73 |ions ..against s| 00000300: 74 61 74 69 63 20 64 69 73 63 68 61 72 67 65 2E |tatic discharge.| 00000310: 0D 0A 0D 0A 4F 70 65 6E 20 74 68 65 20 63 61 73 |....Open the cas| 00000320: 65 20 6F 66 20 74 68 65 20 52 45 55 20 62 79 20 |e of the REU by | 00000330: 67 65 6E 74 6C 79 20 70 72 79 69 6E 67 20 69 74 |gently prying it| 00000340: 20 61 70 61 72 74 2E 20 20 43 61 72 65 66 75 6C | apart. Careful| 00000350: 6C 79 20 72 65 6D 6F 76 65 20 74 68 65 20 0D 0A |ly remove the ..| 00000360: 63 69 72 63 75 69 74 20 62 6F 61 72 64 20 69 6E |circuit board in| 00000370: 20 69 74 73 20 6D 65 74 61 6C 20 52 46 20 73 63 | its metal RF sc| 00000380: 72 65 65 6E 2E 20 20 4F 70 65 6E 20 74 68 65 20 |reen. Open the | 00000390: 73 63 72 65 65 6E 20 61 6E 64 20 72 65 6D 6F 76 |screen and remov| 000003A0: 65 20 74 68 65 20 0D 0A 63 69 72 63 75 69 74 20 |e the ..circuit | 000003B0: 62 6F 61 72 64 2E 20 20 42 65 20 73 75 72 65 20 |board. Be sure | 000003C0: 74 6F 20 67 72 6F 75 6E 64 20 79 6F 75 72 73 65 |to ground yourse| 000003D0: 6C 66 20 77 65 6C 6C 20 28 74 68 69 73 20 63 61 |lf well (this ca| 000003E0: 6E 27 74 20 62 65 20 65 6D 70 68 61 73 69 7A 65 |n't be emphasize| 000003F0: 64 20 0D 0A 65 6E 6F 75 67 68 3B 20 6F 6E 65 20 |d ..enough; one | 00000400: 6C 69 74 74 6C 65 20 73 70 61 72 6B 20 61 6E 64 |little spark and| 00000410: 20 79 6F 75 20 6D 61 79 20 6C 6F 73 65 20 74 68 | you may lose th| 00000420: 65 20 77 68 6F 6C 65 20 70 72 6F 6A 65 63 74 29 |e whole project)| 00000430: 2E 20 20 42 65 20 76 65 72 79 20 0D 0A 63 61 72 |. Be very ..car| 00000440: 65 66 75 6C 20 61 72 6F 75 6E 64 20 74 68 65 20 |eful around the | 00000450: 6C 61 72 67 65 20 49 43 20 6F 6E 20 74 68 65 20 |large IC on the | 00000460: 62 6F 61 72 64 20 6E 65 61 72 20 74 68 65 20 63 |board near the c| 00000470: 6F 6E 6E 65 63 74 6F 72 2E 0D 0A 0D 0A 54 68 65 |onnector.....The| 00000480: 20 6E 65 78 74 20 73 74 65 70 20 69 73 20 74 6F | next step is to| 00000490: 20 64 65 2D 73 6F 6C 64 65 72 20 61 6E 64 20 72 | de-solder and r| 000004A0: 65 6D 6F 76 65 20 74 68 65 20 31 36 20 36 34 4B |emove the 16 64K| 000004B0: 78 31 20 52 41 4D 20 63 68 69 70 73 2E 20 20 28 |x1 RAM chips. (| 000004C0: 54 61 6B 65 20 0D 0A 6E 6F 74 65 20 6F 66 20 77 |Take ..note of w| 000004D0: 68 65 72 65 20 22 70 69 6E 20 31 22 20 6F 6E 20 |here "pin 1" on | 000004E0: 74 68 65 73 65 20 63 68 69 70 73 20 67 6F 65 73 |these chips goes| 000004F0: 2C 20 73 6F 20 74 68 61 74 20 79 6F 75 20 63 61 |, so that you ca| 00000500: 6E 20 69 6E 73 74 61 6C 6C 20 74 68 65 20 6E 65 |n install the ne| 00000510: 77 20 0D 0A 6F 6E 65 73 20 77 69 74 68 20 74 68 |w ..ones with th| 00000520: 65 20 73 61 6D 65 20 6F 72 69 65 6E 74 61 74 69 |e same orientati| 00000530: 6F 6E 2E 29 20 20 44 6F 20 74 68 69 73 20 77 69 |on.) Do this wi| 00000540: 74 68 20 61 20 6D 69 6E 69 6D 75 6D 20 6F 66 20 |th a minimum of | 00000550: 68 65 61 74 2C 20 73 6F 20 61 73 20 6E 6F 74 20 |heat, so as not | 00000560: 0D 0A 74 6F 20 64 61 6D 61 67 65 20 74 68 65 20 |..to damage the | 00000570: 63 68 69 70 73 2E 20 20 49 66 20 79 6F 75 20 61 |chips. If you a| 00000580: 72 65 20 75 73 69 6E 67 20 61 20 73 70 72 69 6E |re using a sprin| 00000590: 67 2D 6C 6F 61 64 65 64 20 22 73 6F 6C 64 65 72 |g-loaded "solder| 000005A0: 20 73 75 63 6B 65 72 22 20 62 65 20 0D 0A 53 55 | sucker" be ..SU| 000005B0: 52 45 20 74 6F 20 67 72 6F 75 6E 64 20 79 6F 75 |RE to ground you| 000005C0: 72 73 65 6C 66 20 6F 66 74 65 6E 2E 0D 0A 0D 0A |rself often.....| 000005D0: 57 68 65 6E 20 74 68 6F 73 65 20 63 68 69 70 73 |When those chips| 000005E0: 20 61 72 65 20 61 6C 6C 20 6F 75 74 2C 20 69 6E | are all out, in| 000005F0: 73 74 61 6C 6C 20 74 68 65 20 73 6F 63 6B 65 74 |stall the socket| 00000600: 73 20 66 6F 72 20 74 68 65 20 6E 65 77 20 63 68 |s for the new ch| 00000610: 69 70 73 2E 20 20 54 68 69 73 20 0D 0A 6D 61 79 |ips. This ..may| 00000620: 20 73 65 65 6D 20 6C 69 6B 65 20 61 20 74 65 64 | seem like a ted| 00000630: 69 6F 75 73 20 65 78 74 72 61 20 74 61 73 6B 2C |ious extra task,| 00000640: 20 62 75 74 20 69 74 20 69 73 20 77 6F 72 74 68 | but it is worth| 00000650: 20 65 76 65 72 79 20 6D 69 6E 75 74 65 20 6F 66 | every minute of| 00000660: 20 79 6F 75 72 20 0D 0A 74 69 6D 65 2E 20 20 53 | your ..time. S| 00000670: 6F 63 6B 65 74 73 20 61 72 65 20 61 20 6C 6F 74 |ockets are a lot| 00000680: 20 65 61 73 69 65 72 20 74 6F 20 69 6E 73 74 61 | easier to insta| 00000690: 6C 6C 20 74 68 61 6E 20 63 68 69 70 73 20 61 72 |ll than chips ar| 000006A0: 65 2C 20 61 6E 64 20 79 6F 75 20 64 6F 6E 27 74 |e, and you don't| 000006B0: 20 0D 0A 68 61 76 65 20 74 6F 20 77 6F 72 72 79 | ..have to worry| 000006C0: 20 71 75 69 74 65 20 73 6F 20 6D 75 63 68 20 61 | quite so much a| 000006D0: 62 6F 75 74 20 65 78 63 65 73 73 69 76 65 20 68 |bout excessive h| 000006E0: 65 61 74 20 6F 6E 20 61 20 73 6F 63 6B 65 74 2E |eat on a socket.| 000006F0: 20 20 4F 6E 63 65 20 74 68 65 20 0D 0A 73 6F 63 | Once the ..soc| 00000700: 6B 65 74 73 20 61 72 65 20 69 6E 20 70 6C 61 63 |kets are in plac| 00000710: 65 2C 20 69 6E 73 74 61 6C 6C 20 74 68 65 20 6E |e, install the n| 00000720: 65 77 20 63 68 69 70 73 2C 20 62 65 69 6E 67 20 |ew chips, being | 00000730: 73 75 72 65 20 74 68 61 74 20 74 68 65 20 22 70 |sure that the "p| 00000740: 69 6E 20 31 22 20 0D 0A 6F 72 69 65 6E 74 61 74 |in 1" ..orientat| 00000750: 69 6F 6E 20 69 73 20 63 6F 72 72 65 63 74 2E 0D |ion is correct..| 00000760: 0A 0D 0A 4E 65 78 74 2C 20 63 75 74 20 74 68 65 |...Next, cut the| 00000770: 20 74 72 61 63 65 20 6F 6E 20 74 68 65 20 63 69 | trace on the ci| 00000780: 72 63 75 69 74 20 62 6F 61 72 64 20 74 68 61 74 |rcuit board that| 00000790: 20 69 73 20 6D 61 72 6B 65 64 20 22 35 31 32 4B | is marked "512K| 000007A0: 20 63 75 74 2E 22 20 20 54 68 65 6E 20 0D 0A 79 | cut." Then ..y| 000007B0: 6F 75 20 73 68 6F 75 6C 64 20 75 73 65 20 61 20 |ou should use a | 000007C0: 6D 65 74 65 72 20 74 6F 20 63 68 65 63 6B 20 66 |meter to check f| 000007D0: 6F 72 20 61 20 70 6F 77 65 72 2D 74 6F 2D 67 72 |or a power-to-gr| 000007E0: 6F 75 6E 64 20 73 68 6F 72 74 2E 20 20 54 68 65 |ound short. The| 000007F0: 20 69 6D 70 65 64 61 6E 63 65 20 0D 0A 62 65 74 | impedance ..bet| 00000800: 77 65 65 6E 20 22 2B 35 22 20 61 6E 64 20 22 67 |ween "+5" and "g| 00000810: 72 6F 75 6E 64 22 20 73 68 6F 75 6C 64 20 62 65 |round" should be| 00000820: 20 61 62 6F 75 74 20 37 2D 31 35 20 6F 68 6D 73 | about 7-15 ohms| 00000830: 2E 0D 0A 0D 0A 43 61 72 65 66 75 6C 6C 79 20 70 |.....Carefully p| 00000840: 75 74 20 74 68 65 20 75 6E 69 74 20 62 61 63 6B |ut the unit back| 00000850: 20 74 6F 67 65 74 68 65 72 2C 20 6D 61 6B 69 6E | together, makin| 00000860: 67 20 73 75 72 65 20 61 6C 6C 20 74 68 65 20 70 |g sure all the p| 00000870: 61 72 74 73 20 61 72 65 20 62 61 63 6B 20 69 6E |arts are back in| 00000880: 20 0D 0A 70 6F 73 69 74 69 6F 6E 2E 20 20 4D 61 | ..position. Ma| 00000890: 6B 65 20 73 75 72 65 20 79 6F 75 72 20 63 6F 6D |ke sure your com| 000008A0: 70 75 74 65 72 20 69 73 20 4F 46 46 2C 20 69 6E |puter is OFF, in| 000008B0: 73 74 61 6C 6C 20 74 68 65 20 52 45 55 2C 20 61 |stall the REU, a| 000008C0: 6E 64 20 74 68 65 6E 20 74 75 72 6E 20 0D 0A 74 |nd then turn ..t| 000008D0: 68 65 20 63 6F 6D 70 75 74 65 72 20 6F 6E 2E 20 |he computer on. | 000008E0: 20 59 6F 75 20 73 68 6F 75 6C 64 20 62 65 20 61 | You should be a| 000008F0: 62 6C 65 20 74 6F 20 72 75 6E 20 74 68 65 20 52 |ble to run the R| 00000900: 41 4D 54 45 53 54 20 70 72 6F 67 72 61 6D 20 74 |AMTEST program t| 00000910: 68 61 74 20 63 6F 6D 65 73 20 0D 0A 77 69 74 68 |hat comes ..with| 00000920: 20 74 68 65 20 52 45 55 20 61 74 20 74 68 69 73 | the REU at this| 00000930: 20 70 6F 69 6E 74 2C 20 61 6E 64 20 69 74 20 73 | point, and it s| 00000940: 68 6F 75 6C 64 20 73 68 6F 77 20 79 6F 75 20 74 |hould show you t| 00000950: 68 61 74 20 74 68 65 20 6E 65 77 20 6D 65 6D 6F |hat the new memo| 00000960: 72 79 20 69 73 20 0D 0A 6F 70 65 72 61 74 69 6E |ry is ..operatin| 00000970: 67 2E 20 20 49 66 20 79 6F 75 27 76 65 20 64 6F |g. If you've do| 00000980: 6E 65 20 79 6F 75 72 20 77 6F 72 6B 20 63 61 72 |ne your work car| 00000990: 65 66 75 6C 6C 79 2C 20 61 6C 6C 20 73 68 6F 75 |efully, all shou| 000009A0: 6C 64 20 62 65 20 77 65 6C 6C 2E 20 20 49 66 20 |ld be well. If | 000009B0: 0D 0A 79 6F 75 72 20 75 6E 69 74 20 69 73 6E 27 |..your unit isn'| 000009C0: 74 20 77 6F 72 6B 69 6E 67 20 72 69 67 68 74 2C |t working right,| 000009D0: 20 63 68 65 63 6B 20 61 6C 6C 20 79 6F 75 72 20 | check all your | 000009E0: 73 6F 6C 64 65 72 20 6A 6F 69 6E 74 73 20 63 61 |solder joints ca| 000009F0: 72 65 66 75 6C 6C 79 20 61 6E 64 20 0D 0A 6D 61 |refully and ..ma| 00000A00: 6B 65 20 73 75 72 65 20 79 6F 75 20 68 61 76 65 |ke sure you have| 00000A10: 6E 27 74 20 62 65 6E 74 20 61 6E 79 20 6F 66 20 |n't bent any of | 00000A20: 74 68 65 20 70 69 6E 73 20 6F 6E 20 61 6E 79 20 |the pins on any | 00000A30: 6F 66 20 74 68 65 20 49 43 27 73 20 77 68 65 6E |of the IC's when| 00000A40: 20 79 6F 75 20 0D 0A 69 6E 73 74 61 6C 6C 65 64 | you ..installed| 00000A50: 20 74 68 65 6D 20 69 6E 20 74 68 65 69 72 20 73 | them in their s| 00000A60: 6F 63 6B 65 74 73 2E 20 20 54 68 69 73 20 69 73 |ockets. This is| 00000A70: 20 61 20 63 6F 6D 6D 6F 6E 20 63 61 75 73 65 20 | a common cause | 00000A80: 6F 66 20 70 72 6F 62 6C 65 6D 73 2E 20 20 49 66 |of problems. If| 00000A90: 20 0D 0A 79 6F 75 27 76 65 20 62 65 6E 74 20 61 | ..you've bent a| 00000AA0: 20 70 69 6E 2C 20 79 6F 75 20 73 68 6F 75 6C 64 | pin, you should| 00000AB0: 20 62 65 20 61 62 6C 65 20 74 6F 20 62 65 6E 64 | be able to bend| 00000AC0: 20 69 74 20 62 61 63 6B 20 69 6E 74 6F 20 70 6C | it back into pl| 00000AD0: 61 63 65 2C 20 62 75 74 20 74 68 6F 73 65 20 0D |ace, but those .| 00000AE0: 0A 70 69 6E 73 20 77 69 6C 6C 20 6E 6F 74 20 62 |.pins will not b| 00000AF0: 65 6E 64 20 61 6E 79 20 6D 6F 72 65 20 77 69 74 |end any more wit| 00000B00: 68 6F 75 74 20 62 72 65 61 6B 69 6E 67 20 6F 66 |hout breaking of| 00000B10: 66 2C 20 73 6F 20 77 6F 72 6B 20 63 61 72 65 66 |f, so work caref| 00000B20: 75 6C 6C 79 2E 0D |ully.. |
THIS FILE GIVES INSTRUCTIONS FOR MODIFYI NG A COMMODORE 1700 REU TO EXPAND ..THE MEMORY TO 512K (EQUIVALENT TO A 1750). BE AWARE THAT THIS MODIFICATION ..IS NOT SUPPORTED BY COMMODORE, AND IF YOU TRY IT YOU WILL DEFINITELY VOID ..YOUR WARRA NTY. THIS IS NOT FOR SOMEONE WHO'S NEVE R SOLDERED OR DE-SOLDERED ..BEFORE, EITH ER, SO BE WARNED. YOU WILL NEED 16 256K RAM CHIPS (41264) AND ..SOCKETS FOR THE M. YOU SHOULD USE 120NS CHIPS IF AT ALL POSSIBLE.....FIRST, FIND A GOOD, WELL-L IGHTED WORKSPACE. THIS JOB TAKES TIME, AND YOU ..WANT TO MAKE SURE YOU CAN LEAV E THE REU IN A SAFE PLACE IF YOU DON'T F INISH ..IT ALL IN ONE SITTING. BE SURE YOU CAN GROUND YOURSELF EASILY, BECAUSE IC ..CHIPS ARE EXTREMELY SENSITIVE TO ST ATIC. TAKE ALL POSSIBLE PRECAUTIONS ..A GAINST STATIC DISCHARGE.....OPEN THE CAS E OF THE REU BY GENTLY PRYING IT APART. CAREFULLY REMOVE THE ..CIRCUIT BOARD IN ITS METAL RF SCREEN. OPEN THE SCREEN A ND REMOVE THE ..CIRCUIT BOARD. BE SURE TO GROUND YOURSELF WELL (THIS CAN'T BE E MPHASIZED ..ENOUGH; ONE LITTLE SPARK AND YOU MAY LOSE THE WHOLE PROJECT). BE VE RY ..CAREFUL AROUND THE LARGE IC ON THE BOARD NEAR THE CONNECTOR.....THE NEXT ST EP IS TO DE-SOLDER AND REMOVE THE 16 64K X1 RAM CHIPS. (TAKE ..NOTE OF WHERE "PI N 1" ON THESE CHIPS GOES, SO THAT YOU CA N INSTALL THE NEW ..ONES WITH THE SAME O RIENTATION.) DO THIS WITH A MINIMUM OF HEAT, SO AS NOT ..TO DAMAGE THE CHIPS. IF YOU ARE USING A SPRING-LOADED "SOLDER SUCKER" BE ..SURE TO GROUND YOURSELF OF TEN.....WHEN THOSE CHIPS ARE ALL OUT, IN STALL THE SOCKETS FOR THE NEW CHIPS. TH IS ..MAY SEEM LIKE A TEDIOUS EXTRA TASK, BUT IT IS WORTH EVERY MINUTE OF YOUR .. TIME. SOCKETS ARE A LOT EASIER TO INSTA LL THAN CHIPS ARE, AND YOU DON'T ..HAVE TO WORRY QUITE SO MUCH ABOUT EXCESSIVE H EAT ON A SOCKET. ONCE THE ..SOCKETS ARE IN PLACE, INSTALL THE NEW CHIPS, BEING SURE THAT THE "PIN 1" ..ORIENTATION IS C ORRECT.....NEXT, CUT THE TRACE ON THE CI RCUIT BOARD THAT IS MARKED "512K CUT." THEN ..YOU SHOULD USE A METER TO CHECK F OR A POWER-TO-GROUND SHORT. THE IMPEDAN CE ..BETWEEN "+5" AND "GROUND" SHOULD BE ABOUT 7-15 OHMS.....CAREFULLY PUT THE U NIT BACK TOGETHER, MAKING SURE ALL THE P ARTS ARE BACK IN ..POSITION. MAKE SURE YOUR COMPUTER IS OFF, INSTALL THE REU, A ND THEN TURN ..THE COMPUTER ON. YOU SHO ULD BE ABLE TO RUN THE RAMTEST PROGRAM T HAT COMES ..WITH THE REU AT THIS POINT, AND IT SHOULD SHOW YOU THAT THE NEW MEMO RY IS ..OPERATING. IF YOU'VE DONE YOUR WORK CAREFULLY, ALL SHOULD BE WELL. IF ..YOUR UNIT ISN'T WORKING RIGHT, CHECK A LL YOUR SOLDER JOINTS CAREFULLY AND ..MA KE SURE YOU HAVEN'T BENT ANY OF THE PINS ON ANY OF THE IC'S WHEN YOU ..INSTALLED THEM IN THEIR SOCKETS. THIS IS A COMMO N CAUSE OF PROBLEMS. IF ..YOU'VE BENT A PIN, YOU SHOULD BE ABLE TO BEND IT BACK INTO PLACE, BUT THOSE ..PINS WILL NOT B END ANY MORE WITHOUT BREAKING OFF, SO WO RK CAREFULLY..
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