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- Instructions:
- -------------
-
- In following steps, the reconstruction of A2630-Board is described in detail.
-
- Parts list :
-
- 8 MB: 16 x Ram (TC514400AZ-100 or faster)
- 16 x ZIP-sockets or single inline sockets (SIL-sockets)
- 1 x 74F257 (in case of damaging original)
- 1 x 16-pol. IC-socket
- 1 x 33 Ohm resistor
- ca. 1 meter isolated wire, 0.25 mm diameter
-
- 16 MB: 32 x Ram (TC514400AZ-100 or faster)
- 32 x ZIP-sockets or single inline sockets (SIL-sockets)
- 1 x 74F138
- 1 x 74F257 (in case of damaging original)
- 1 x 16-pol. IC-socket
- 1 x 33 Ohm resistor
- ca. 1 meter isolated wire, 0.25 mm diameter
-
- ******* 2 new pals (Contact address see end of text)
-
- ------------------------------------------------------------------------------
-
- 1. Desolder rams U400 - U431 see picture '2630.rams'.
-
-
- 2. Free all soldering-pads of rams.
- (work carefully)
-
- 3. Mount SIL-sockets (resp. special ZIP-sockets) to places
- U400 - U431. (later location of rams)
-
-
- 4. Connect all Pin 10 of ram-sockets see picture '2630.mux'
-
-
- 5. Desolder U104 and perform orders described in picture '2630.u104'
-
-
- 6. Connect U104 pin 5 with U304 pin 11 with a wire and do the
- same with U104 pin 6 and U304 pin 13.
- see picture '2630.mux'
-
-
-
- ********************* A T T E N T I O N **********************
- * *
- * Complete section '7. - 7.5' only for 16 MB reconstruction *
- * Continue with step '8.' for 8 MB reconstruction. *
- * *
- **************************************************************
-
- 7. Mount additionally used IC (Typ 74F138) as follows :
-
- 7.1 Prepare : All pins of 74F138 (except of pin 8 and 16)
- must be shortened downto approx. 2-3 mm. ( 1/10 inch)
-
- 7.2 Mount IC 74F138 with glue on A2630 upside down.
- see picture '2630.138'
-
- 7.3 Carefully bend pin 8 and 16 of 74F138.
- see picture '2630.138' for details
- (New IC is connected to power.)
-
- 7.4 Make connections between pin 1-6 of 74F138 with relevant pins
- of processor. see picture '2630.138'
-
- 7.5 Connect pin 15 of 74F138 with U305 pin 15 via wire.
- see picture '2630.138'
-
- ***** soldering part is done now !
-
-
- ************************* A T T E N T I O N **************************
- * *
- * Continue here with 8 MB reconstruction *
- * (also for 16MB) *
- * *
- **********************************************************************
-
- 8. Change pals U301 and U305 with delivered pals with same
- print-on. see picture '2630.pals'
-
-
- 9. Mounting of rams '8 MB reconstruction' :
-
- U400 - U415 see picture '2630.rams'
-
- Mounting of rams '16 MB reconstruction' :
-
- U400 - U431
-
- 10. Check complete reconstruction :
- Check out cold soldering points and/or short-circuits!!
-
-
- 11. Put back A2630 into your computer.
-
- 12. Perform ramtest with A2630 on-board checkroutine :
-
- 12.1 After switch-on, hold down right mousebutton immediately.
- A white screen with blue text and blue gadgets will appear.
-
- While holding down right mousebutton press following keys :
- RIGHT-AMIGA + SHIFT + M
-
- Monitor-program will come up.
-
- To test lower 8 MB-memory, type in following command :
- t 200000 a00000
-
- 12.2 Different bit-patterns are tested and reported.
-
- Test will be terminate by CTRL-C.
- (this procedure can take some time, be patiently.
- To accelerate termination, perform reset by pressing following keys:
- CTRL + LEFT-AMIGA + RIGHT-AMIGA (and continue with step 12.1)
-
- To test upper 8 MB-memory, type in following command :
- t 8200000 8a00000
- (see step 12.2)
-
- We hope you will enjoy this reconstruction and your work-out is done
- successful.
-
- In case of problems and/or more detailed informations, contact:
-
- good old GERMANY :))
-
- Name : Dirk Timmermann Name : Thomas Riedel
- Town : 27755 Delmenhorst Town : 28757 Bremen
- Street : Jaegerstr. 138 Street : Gerhard-Rohlfsstr.33
- Telephon : (49) 4221-66199 Telephon : (49) 421-665512
-
-