SWITCHED EPROMS
Justin Albury
jalbury at tpgi.com.au
Sun Jul 20 21:48:14 GMT 1997
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Hi to those who are intrested in eprom switching
i have found the these to work fine in the P4 and also in TECH-1
cartridges. if you use the same base code and only change the data of
the bin file ( say spark and fuel ) then they will switch while the car
is running ok , but if they are totaly different well they give a bit of
a cough and hickup but you can still switch while running but youll have
to keep the revs up.
please if anyone has more ideas on how to make em better please mail me
Justin
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EPPROM PINOUTS 28/32 PIN
________________________
____ _____
Vpp--|1 * 28|--Vcc Chip Size = 256K-bit
A12--| |--A14 00000 - 07fff
A7--| |--A13
A6--| |--A8
A5--| |--A9
A4--| 256K-bit |--A11
A3--| |--OE
A2--| |--A10
A1--| |--CE/PGM
A0--| |--O7
O0--| |--O6
O1--| |--O5
O2--| |--O4
Gnd--|__________|--O3
____ _____
A15--|1 * 28|--Vcc Chip Size = 512K-bit
A12--| |--A14 00000 - 0ffff
A7--| |--A13
A6--| |--A8
A5--| |--A9
A4--| 512K-bit |--A11
A3--| |--Vpp/OE
A2--| |--A10
A1--| |--PGM/CE
A0--| |--O7
O0--| |--O6
O1--| |--O5
O2--| |--O4
GND--|__________|--O3
____ _____
Vpp--|1 * 32|--Vcc Chip Size = 1M-bit
A16--| |--PGM 00000 - 1ffff
A15--| |--NC
A12--| |--A14
A7--| |--A13
A6--| 1M-bit |--A8
A5--| |--A9
A4--| |--A11
A3--| |--CE
A2--| |--A10
A1--| |--CE
A0--| |--O7
O0--| |--O6
01--| |--O5
02--| |--O4
GND--|__________|--O3
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TWIN TABLE SWITCHABLE EPROMS 28/32 PIN Juz!
_____________________________________________________________________________
/
/ SW1
____ _____ | |
Vpp--|1 * 28|--Vcc-----+ |
A12--| |--A14--------+
A7--| |--A13 | Chip size 256K-bit
A6--| |--A8 | 00000 - 07fff
A5--| |--A9 |
A4--| 256K-bit |--A11 | 2 x 128K-bit
A3--| |--OE \ 00000 - 03fff = Chip Low
A2--| |--A10 / 04000 - 07fff = Chip Hi
A1--| |--CE/PGM \ R1
A0--| |--O7 / Chip Low = A14
O0--| |--O6 | to Gnd Via R1. 00000 - 03fff
O1--| |--O5 |
O2--| |--O4 | Chip Hi = 5V at A14
+----Gnd--|__________|--O3 | 04000 - 07fff
| |
+----------------------------------+ R1 = 4.7K (Pull down resistor
for Chip Low 00000 - 03fff)
/ SW1
+-------/ ------------------+
| ____ _____ |
+----A15--|1 * 28|--Vcc--+ Chip Size = 512K-bit
| A12--| |--A14 00000 - 0ffff
| A7--| |--A13
| A6--| |--A8 2 x 256K-bit
/ A5--| |--A9 00000 - 07fff = Chip Low
\ A4--| 512K-bit |--A11 08000 - 0ffff = Chip Hi
/ A3--| |--Vpp/OE
\ A2--| |--A10 Chip Low = A15
/ A1--| |--PGM/CE to Gnd Via R1. 00000 - 07fff
| A0--| |--O7
| O0--| |--O6 Chip Hi = 5V at A15
| O1--| |--O5 08000 - 0ffff
| O2--| |--O4
+----GND--|__________|--O3 R1 = 4.7K (Pull down resistor
for Chip Low 00000 - 07fff)
\
+-- \-------------------------------------+
| SW1 ____ _____ |
| Vpp--|1 * 32|--Vcc-----+
+------------+---A16--| |--PGM Chip Size = 1M-bit
| A15--| |--NC 00000 - 1ffff
| A12--| |--A14
| A7--| |--A13 2 x 512K-bit
| A6--| 1M-bit |--A8 00000 - 0ffff = Chip Low
/ A5--| |--A9 10000 - 1ffff = Chip Hi
R1 \ A4--| |--A11
/ A3--| |--CE Chip Low = A16
\ A2--| |--A10 to Gnd Via R1.00000-0ffff
/ A1--| |--CE
| A0--| |--O7 Chip Hi = 5V at A16
| O0--| |--O6 10000 - 1ffff
| 01--| |--O5
| 02--| |--O4 R1 = 4.7K (Pull down
+---GND--|__________|--O3 resistor for Chip Low
00000 - 0ffff)
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QUAD TABLE SWITCHABLE EPROMS 28/32 PIN Juz!
_____________________________________________________________________________
/ /
SW1 / / SW2 Chip Size = 256K-bit
____ _____ | | | | 00000 - 07fff
Vpp--|1 * 28|--Vcc---+--|---+ |
A12--| |--A14------+ | SW1 SW2 Address
A7--| |--A13------|------+ 1 - Off Off 00000 - 01fff
A6--| |--A8 | | 2 - Off On 02000 - 03fff
A5--| |--A9 | | 3 - On Off 04000 - 05fff
A4--| 256K-bit |--A11 | | 4 - On On 06000 - 07fff
A3--| |--OE \ \
A2--| |--A10 / / R1 = 4.7K (Pull down
A1--| |--CE/PGM \ R1 \ R2 resistor for SW1)
A0--| |--O7 / /
O0--| |--O6 | | R2 = 4.7K (Pull down
O1--| |--O5 | | resistor for SW2)
O2--| |--O4 | |
+----Gnd--|__________|--O3 | | 4 x 64K-bit
| | |
+--------------------------------+------+
\ \
SW1 \ \ SW2
| | | |
+---------------------------+ | | |
| ____ _____ | | |
+----A15--|1 * 28|--Vcc----+---|--+ Chip Size = 512K-bit
| A12--| |--A14--------+ 00000 - 0ffff
| A7--| |--A13 |
| A6--| |--A8 | SW1 SW2 Address
| A5--| |--A9 | 1 - Off Off 00000 - 03fff
| A4--| 512K-bit |--A11 | 2 - Off On 04000 - 07fff
/ A3--| |--Vpp/OE / 3 - On Off 08000 - 0bfff
\ A2--| |--A10 \ 4 - On On 0c000 - 0ffff
/R1 A1--| |--PGM/CE / R2
\ A0--| |--O7 \ R1 = 4.7K (Pull down
/ O0--| |--O6 / resistor for SW1)
| O1--| |--O5 |
| O2--| |--O4 | R2 = 4.7K (Pull down
+----GND--|__________|--O3 | resistor for SW2)
| |
+----------------------------------+ 4 x 128K-bit
\ /
SW1 \ / SW2 +--------------------------+
| | | | | ____ _____ |
| +---+--|---+ Vpp--|1 * 32|--Vcc--+
+---------|------A16--| |--PGM Chip Size = 1M-bit
| +--+---A15--| |--NC 00000 - 1ffff
| | A12--| |--A14
| | A7--| |--A13 SW1 SW2 Address
| | A6--| 1M-bit |--A8 1 - Off Off 00000 - 07fff
/ / A5--| |--A9 2 - Off On 08000 - 0ffff
\ R1 R2 \ A4--| |--A11 3 - On Off 10000 - 17fff
/ / A3--| |--CE 4 - On On 18fff - 1ffff
\ \ A2--| |--A10
/ / A1--| |--CE R1 = 4.7K (Pull down
| | A0--| |--O7 resistor for SW1)
| | O0--| |--O6
| | 01--| |--O5 R2 = 4.7K (Pull down
| | 02--| |--O4 resistor for SW2)
+------------+---GND--|__________|--O3
4 x 256K-bit
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