Latest revision as of 18:28, 15 August 2023

The only non-protected board that can bankswitch and use all V ROM space. Really common and very useful for homebrew stuff or converts.

Often used as the PROG board in Neo Print cartridges.

P ROMs configuration

EP ROMs /OE

J1	J2
/ROMOE	/PORTOE

P2 ROM /CE

J3	J4	J5
A18	/A18	GND (default)

P2 ROM /OE

J6	J7	JB1
/ROMOE	/PORTOE (default)	/PORTOE, banks 0 and 1

P1 ROM /OE

J8	J9	J10	JB2
/PORTOE	/PORTOE AND /ROMOE	/ROMOE (default)	/PORTOE, banks 2 and 3

P1 ROM /CE

J11	J12	J13
A18	/A18	GND (default)

P1 ROM size

JB3	JB4	Nothing
A19/NC is /PORTADRS (P1 is 16Mbit)	A19/NC is BANK0 (because reasons?)	P1 is 8Mbit

P2 ROM size

JB5	JB6
A20//BYTE is VCC (P2 is 16Mbit or less)	A20//BYTE is BANK1 (P2 is 32Mbit)

The P1 ROM can be 4Mbit, 8Mbit or 16Mbit (27C400/27C800/27C160).

ROMs can be halved and mapped to 0x000000~0x0FFFFF or 0x200000~0x2FFFFF.
If P1 is 4Mbit or 8Mbit, then P2 can contain a bankswitched ROM (same type as P1 plus 27C322). P1 appears in 0x000000~0x0FFFFF. P2 bank appears in 0x200000~0x2FFFFF.

Bankswitching is done with the LS74. It's not needed if the game isn't banked. Any write to an odd address in the 0x200000~0x2FFFFF range will set the bank.

V ROMs configuration

There is a maximum of 4 V ROMs which can be 8Mbit, 16Mbit or 32Mbit (27C800/27C160/27C322) for a maximum total size of 4 * 4MiB = 16MiB.

A 4Mbit ROM can also be used, but only if there's one and only if it's in the last used slot.

The size of the largest V ROM is selected with a pair of jumpers on 6 spots (3 possible choices).

Largest V ROM	Jumper set
8Mbit (1MiB)	JV1+JV2
16Mbit (2MiB)	JV3+JV4
32Mbit (4MiB)	JV5+JV6

This pair of V ROM jumpers effectively choose a set of 2 of the PCM chip address outputs to input to the LS139, which will enable one out of the 4 V ROMs at a time.

The JV7 to JV14 jumpers need to be set according to the ROM types. If it's less than 32Mbit, the JV7/JV8/JV9/JV10 jumper needs to be set (ground). If it's 32Mbit, the JV11/JV12/JV13/JV14 needs to be set (A20). This is because 32Mbit chips have their /BYTE pin replaced by A20.

Other

The LS08 is used to AND the /PORTOEU and /PORTOEL signals to get /PORTOE.

4x 1/2/4MiB V ROMs
1/2MiB P1 ROM
1/2/4MiB P2 ROM
2x 512KiB EP1/EP2 ROM
PCM chip
LS139, LS08, LS74A

@@ Line 1: / Line 1: @@
+[[File:Progbk1_mvs.jpg|thumb]]
 The only non-protected board that can bankswitch and use all [[V ROM]] space. Really common and very useful for homebrew stuff or converts.
-===P ROMs===
+Often used as the PROG board in [[Neo Print]] cartridges.
-[[File:Progbk1p.png]]
+=P ROMs configuration=
+[[File:Progbk1p.png|650px]]
+==EP ROMs /OE==
 {| class="wikitable"
@@ Line 10: / Line 16: @@
 !J2
 |-
-|EP ROMs /OE are /ROMOE
+|/ROMOE
-|EP ROMs /OE are /PORTOE
+|/PORTOE
 |}
+==P2 ROM /CE==
 {| class="wikitable"
@@ Line 20: / Line 28: @@
 !J5
 |-
-|P2 /CE is A18
+|A18
-|P2 /CE is /A19
+|/A18
-|P2 /CE is GND (default)
+|GND (default)
 |}
+==P2 ROM /OE==
 {| class="wikitable"
@@ Line 31: / Line 41: @@
 !JB1
 |-
-|P2 /OE is /ROMOE
+|/ROMOE
-|P2 /OE is /PORTOE (default)
+|/PORTOE (default)
-|P2 /OE is /PORTOE, banks 0 and 1
+|/PORTOE, banks 0 and 1
 |}
+==P1 ROM /OE==
 {| class="wikitable"
@@ Line 43: / Line 55: @@
 !JB2
 |-
-|P1 /OE is /PORTOE
+|/PORTOE
-|P1 /OE is /PORTOE AND /ROMOE
+|/PORTOE AND /ROMOE
-|P1 /OE is /ROMOE (default)
+|/ROMOE (default)
-|P1 /OE is /PORTOE, banks 2 and 3
+|/PORTOE, banks 2 and 3
 |}
+==P1 ROM /CE==
 {| class="wikitable"
@@ Line 55: / Line 69: @@
 !J13
 |-
-|P1 /CE is A18
+|A18
-|P1 /CE is /A18
+|/A18
-|P1 /CE is GND (default)
+|GND (default)
 |}
+==P1 ROM size==
 {| class="wikitable"
@@ Line 66: / Line 82: @@
 !Nothing
 |-
-|P1 A19/NC is /PORTADRS
+|A19/NC is /PORTADRS (P1 is 16Mbit)
-|P1 A19/NC is BANK0 (P1 is 16Mbit)
+|A19/NC is BANK0 (because reasons?)
 |P1 is 8Mbit
 |}
+==P2 ROM size==
 {| class="wikitable"
@@ Line 76: / Line 94: @@
 !JB6
 |-
-|P2 A20//BYTE is VCC (P2 is 16Mbit or less)
+|A20//BYTE is VCC (P2 is 16Mbit or less)
-|P2 A20//BYTE is BANK1 (P2 is 32Mbit)
+|A20//BYTE is BANK1 (P2 is 32Mbit)
 |}
 The [[P ROM|P1 ROM]] can be 4Mbit, 8Mbit or 16Mbit (27C400/27C800/27C160).
-*ROMs can be halved and mapped to 0x000000~0x0FFFFF or 0x200000~0x2FFFFF.
+* ROMs can be halved and mapped to 0x000000~0x0FFFFF or 0x200000~0x2FFFFF.
-*If P1 is 4Mbit or 8Mbit, then P2 can contain a bankswitched ROM (same type as P1 plus 27C322). P1 appears in 0x000000~0x0FFFFF. P2 bank appears in 0x200000~0x2FFFFF.
+* If P1 is 4Mbit or 8Mbit, then P2 can contain a bankswitched ROM (same type as P1 plus 27C322). P1 appears in 0x000000~0x0FFFFF. P2 bank appears in 0x200000~0x2FFFFF.
 [[Bankswitching]] is done with the LS74. It's not needed if the game isn't banked. Any write to an odd address in the [[68k memory map|0x200000~0x2FFFFF]] range will set the bank.
-===V ROM===
+=V ROMs configuration=
 [[File:Progbk1v.png]]
@@ Line 115: / Line 133: @@
 The JV7 to JV14 jumpers need to be set according to the ROM types. If it's less than 32Mbit, the JV7/JV8/JV9/JV10 jumper needs to be set (ground). If it's 32Mbit, the JV11/JV12/JV13/JV14 needs to be set (A20). This is because 32Mbit chips have their /BYTE pin replaced by A20.
-===Other===
+=Other=
-The LS08 is used to AND the /PORTOEU and /PORTOEL signals to get a /PORTOE.
+The LS08 is used to AND the /PORTOEU and /PORTOEL signals to get /PORTOE.
-*4x 1/2/4MiB V ROMs
+* 4x 1/2/4MiB V ROMs
-*1/2MiB P1 ROM
+* 1/2MiB P1 ROM
-*1/2/4MiB P2 ROM
+* 1/2/4MiB P2 ROM
-*2x 512KiB EP1/EP2 ROM
+* 2x 512KiB EP1/EP2 ROM
-*[[PCM]] chip
+* {{Chipname|PCM}} chip
-*LS139,LS08,LS74
+* LS139, LS08, LS74A
 [[Category:Cartridge boards]]

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