Stag P301 handheld devices programmer
Programmateur autonome Stag P301

STAG P301 resources page


SRAM Memory Expansion Card M5M51008 to add memory to the programmer (cf. Chapter 2.7 documentation);

P322 schematic ( PDF- 777Kb) untested



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Power Supply ratings 12VDC @ 500mA positive to center


Part No GBS706 8.4V 600mAh

in P301 Hand Held Programmer Technical Specification Stag Programmer P301 (PDF-3 pages) you have the partnumber of this card : P321 4Mbit Memory Expansion card; P322 8Mbit Memory Expansion card.

firmware V8.02 29F040 (checksum E537) (BIN file - 512 Kb)

The connector on the P301 is a DB9 male. the cable is a cheap null-modem DB9 F-F cable.

On page 28 of the user's manual it shows the pinout for the 9 pin connector on the P301

and on page 29 it states that hardware handshaking must be
used with StagCom for Windows as described in the "README.1ST" file :-)

Pins 1 & 9 are not used so I would try a 9 pin to 9 pin cable wired as

2 ------------------ 3
3 ------------------ 2
4 ------------------ 6
5 ------------------ 5
6 ------------------ 4
7 ------------------ 8
8 ------------------ 7

p.s. The problem updating the P301 firmware may be because the later StagCom (for DOS and Windows) may not be reliable on newer PC hardware. Although the P301 supports RTS/CTS handshaking, my experience with PP42 etc showed that it was not tested properly with a fast PC. Sending data from a PC to a Stag programmer can be tricky, getting StagView to work reliably took a long time. If someone really must upgrade it they should use a slow baud rate, 9600 or less.

stag P301 Operating Manual ( PDF -114 pages - 4.19Mb)

Stag P301 Devices Support List Version 8.04 (PDF - 9 pages - 37 Kb)

p301.dat Stag P301 Version 8.04 device list (.dat - 10KB)

Stag P301 Tech Spec (PDF - 3 pages 45 Kb)

Stag95 software (ZIP Archive - 918Kb) - The StagCom 95 loads and runs in Windows 7 with no problems

stagDisks.rar (.RAR archive - 5.68Mb) includes stagcom_DOS, stagcom_WIN, stagcom95, stagcom95-v95.58.0, PM95, scomw95 manual, P803 devices updates

The last release firmware was Ver 8.04

Archive (ZIP Archive - 773Kb) contains old releases of StagComDOS and StagComWin

Important notice: I do not recommend to update the flash memory of the stag P301 with the Stagcom Software : it has been reported that Stagcom freeze and then the programmer is no longer working : when the operation has been branched into the display now read "Warning Flash module not loader press a key"

8.04 firmware update for the P301


device list P301.DAT file


FLASH127.SBN (229Kb)



You may see also :

STAG PP39 programmer resources page

STAG PP38 programmer resources page

STAG PP41 programmer resources page

STAG PP42 programmer resources page


If you look forward for other information about this Programmer, do not hesitate to contact me by e-mail at: . Also if you have any data about this programmer, do not hesitate to contribute to this page.


Si vous recherchez des informations pour ce programmateur autonome, vous pouvez me contacter par e-mail : . De même si vous avez des informations sur ce programmateur, n'hésitez pas à contribuer à cette page.


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15 août, 2021