2380 Suwanee Dr., MS106-102, Suwanee, GA 30024 - Questions: [email protected]

FAQ - MAChSpeed G3 Switch Settings for old style boards with green rotary switches

Switch 1 sets the Bus Ratio in 1/2 steps from 3:1 to 8:1
Switch 2 sets the Bus Speed in 1/3 MHz steps from 40 MHz to 45MHz

Bus Ratio -> 

4.5

5

5.5

6

6.5

7

7.5

8

 
Switch 1 -> 

3

4

5

6

7

8

9

A

 
Bus Speed
Switch 2
 Processor Speed 

40.00

0

180.0

200.0

220.0

240.0

260.0

280.0

300.0

320.0

40.33

1

181.5

201.7

221.8

242.0

262.2

282.3

302.5

322.7

40.67

2

183.0

203.3

223.7

244.0

264.3

284.7

305.0

325.3

41.00

3

184.5

205.0

225.5

246.0

266.5

287.0

307.5

328.0

41.33

4

186.0

206.7

227.3

248.0

268.7

289.3

310.0

330.7

41.67

5

187.5

208.3

229.2

250.0

270.8

291.7

312.5

333.3

42.00

6

189.0

210.0

231.0

252.0

273.0

294.0

315.0

336.0

42.33

7

190.5

211.7

232.8

254.0

275.2

296.3

317.5

338.7

42.67

8

192.0

213.3

234.7

256.0

277.3

298.7

320.0

341.3

43.00

9

193.5

215.0

236.5

258.0

279.5

301.0

322.5

344.0

43.33

A

195.0

216.7

238.3

260.0

281.7

303.3

325.0

346.7

43.67

B

196.5

218.3

240.2

262.0

283.8

305.7

327.5

349.3

44.00

C

198.0

220.0

242.0

264.0

286.0

308.0

330.0

352.0

44.33

D

199.5

221.7

243.8

266.0

288.2

310.3

332.5

354.7

44.67

E

201.0

223.3

245.7

268.0

290.3

312.7

335.0

357.3

45.00

F

202.5

225.0

247.5

270.0

292.5

315.0

337.5

360.0

Common Settings 
Processor Speed Switch 1 Switch 2

200

3

E

220

4

C

233

5

8

250

6

5

266

6

D

275

7

7

300

8

9

350

A

C