We have discovered two types of flash cartridges shipped with the SUBOR. Earlier models came with SST28VF040 and newer models (shipped from Maked Shed) appear to have come shipped with AMD. This page has ROM dumps from both.
ROM Dumps have been made using homebrewed cartridge adaptors.
Atmega32 breadboard Flash Interface
Atmega128 dev board Flash Interface
SSTV8F040 Stock Image Cartridge (SB-LC-4.0)
These images consist of 2048 sectors of 256 bytes each.
ASCII Versions flash.txt suborflash2.txt suborflash4.txt
binary version: flash.bin
Strings contained within flash.bin: strings.txt
visualization of contents:
AMD Cartridge Stock Image (SB-LC-5.0)
AM29F040-120EC, which has the same pinout as the SST part, except that it is arranged as 16 banks of size 32kB.
Binary Image - http://nomen.nfshost.com/ppower/suborcart0.zip
Cartridge Pinout
Judging from this picture, we thought it looks like the Write Enable pin WE# of the Flash chip is connected to the bus. This would imply being able to write to the SUBOR Flash chip. However, investigation has shown that WE# is connected to Vcc, meaning it's impossible to tell the flash chip to write.
No Carrier has suggested that it might be "possible to wire it up to the R/W signal on the cart edge, should check how the SRAM is connected."
Dave: As for pin 7 of the flash being connected to VCC, it might still be possible to do a simple modification to the cart to allow writing.
The modification would entail cutting a trace going to pin7 and installing a toggle switch between pin 7 and switching between VCC (normal operation) and one of the unused pins on the edge connector. A low-cost microcontroller board could be used as a programmer.
Q: Can someone confirm the trace between pin 7 of Flash and pin 14 or 47 of SUBOR Card Edge Connector?
A: Edge connector pins 14 and 47 don't appear to be connected to the flash chip. (Pin 14 connects to the SRAM pin 27 (/WE), and 47 has no traces routed to it at all on my cart.) (Thanks, Dave!)
Q: How is the SRAM connected?
Data Sheets for Flash Memory Chip on SUBOR Cartridges: 28vf040.pdf 29F040.pdf
Data Sheet for SRAM Chip on SUBOR Cartridges: BR6265.pdf
Device Drivers for Flash Memory Chip on SUBOR Cartridges:
Pinout for Famicom Cartridge, shares many pins with SUBOR: NES_Famicom_Pinouts.pdf
DigiKey Part Number for a female 60-pin Cartridge socket/Card Edge Connector (0.100" pitch, 0.050"-0.075" thick) A31720-ND $3.48
This may be a lead to a simple AVR-based EPROM/Flash Dumper/Writer: AVR EPROM Dumper
Note, Famicom signals CHR D0-D7 are not used by SUBOR. This goes along with the VT02 Data Sheet which states that it is able to operate in "single bus mode." This means that both program
So, now it's time to map out the SRAM chip. DataSheet is below the jump.
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