Another fundraiser..

This fundraiser is multiple lots we have been offered for our museum, most of these are extremely early systems, and many contain unreleased games and history that would other wise be lost.

The goal for this is split into groups, we have awhile to sort this one and lots would be paid as funded. The total includes paypal fee's added and shipping costs included excluding taxes, we put 10% as we're often charged different rates depending on donators locations.
Goal
£4,800.00
Received
£485.36
Latest donor
H Hazard
10%
Custom LBP Developer PS3 containing multiple unreleased games, and multiple alpha builds.
£1,300.00
An early prototype PlayStation 3 dev Kit, in an early shell design which includes a disc filled with build(s? exact contents unknown)
£1,230.00
3x Prototype XBOX's, plus a boxed system believed to be used at E3. + Misc items to be added that are unknown.
£1,230.00
Misc Nintendo systems.
£500.00
The above prices doesn't include paypal fees, please see goal amount for total with 10% added for fee's we're charged.
£0.00
Expenses
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MAD-1 connections on 1A3M-30 PCB - confused

jaskamakkara

Member
Original poster
Jul 16, 2019
5
0
1
AG Join Date
23/08/13
Hi,

For my own education purposes I have been using my multimeter to map out a bunch of different PCBs. I have a copy of Black Bass III (Jap) which uses a 1A3M-30 PCB. Here is the pinout of the MAD-1 as I can tell with my meter:

Code:
MAD-1:
X---------|1 {/RomCS1}  {/RomCS0} 16|---------X
SRAM /CS1-|2 {/SramCS}    {Addr0} 15|-------A15
X---------|3 {/AuxCS}     {Addr1} 14|-------A20
ROM /OE---|4 {/RomCS}     {Addr2} 13|-------A21
SRAM Vcc--|5 {Vout}       {Addr3} 12|-------Vcc
Vcc-------|6 {Vcc}        {/CART} 11|-----/CART
R1--------|7 {Vbat}        {MODE} 10|-------GND
GND-------|8 {GND}       {/RESET}  9|----/RESET

Notice Addr3 is connected to Vcc, in my experience this is normally connected to A22 since that maps the Sram correctly to $70-7D,$F0-FF:$0000-7FFF. However, unless I am completely mistaken, if we connect Addr3 to Vcc won't we be also mapping Sram to $30-3F,$B0-BF:$0000-7FFF (since we don't care about A22 any more)? This area is reserved for all sorts of stuff so why would the cart map the Sram here?

Is it something to do with the fact that this is a 32Mbit ROM? There is some weirdness with LoRoms of this size since the last bit of ROM cannot be accessed in the lower half of the memory map (because WRAM is mapped in the 7E-7F banks I think) so you have to look for it in the upper mirror (FE-FF).
 

Another fundraiser..

This fundraiser is multiple lots we have been offered for our museum, most of these are extremely early systems, and many contain unreleased games and history that would other wise be lost.

The goal for this is split into groups, we have awhile to sort this one and lots would be paid as funded. The total includes paypal fee's added and shipping costs included excluding taxes, we put 10% as we're often charged different rates depending on donators locations.
Goal
£4,800.00
Received
£485.36
Latest donor
H Hazard
10%
Custom LBP Developer PS3 containing multiple unreleased games, and multiple alpha builds.
£1,300.00
An early prototype PlayStation 3 dev Kit, in an early shell design which includes a disc filled with build(s? exact contents unknown)
£1,230.00
3x Prototype XBOX's, plus a boxed system believed to be used at E3. + Misc items to be added that are unknown.
£1,230.00
Misc Nintendo systems.
£500.00
The above prices doesn't include paypal fees, please see goal amount for total with 10% added for fee's we're charged.
£0.00
Expenses