M100ROM - Revision history

Mhstein: Add /CE jumper in place of lower diode.

2018-07-04T21:33:09Z

Add /CE jumper in place of lower diode.

Sadolph: /* Installation */

2015-03-28T19:08:05Z

Installation

← Older revision		Revision as of 12:08, 28 March 2015
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	If you are after an upgrade to Main ROM and also providing an OPTION ROM, then after you plug the module (and verify the machine boots normally), you need to run a wire from M5 pin 5 to the CE2 via. A good solution here is to solder a wire to CE2, and use a clip to connect to the IC pin.		If you are after an upgrade to Main ROM and also providing an OPTION ROM, then after you plug the module (and verify the machine boots normally), you need to run a wire from M5 pin 5 to the CE2 via. A good solution here is to solder a wire to CE2, and use a clip to connect to the IC pin.

	searching for "mini grabber" on ebay ~~yeilds~~ a solution for the clip.		searching for "mini grabber" on ebay yields a solution for the clip.

Sadolph: /* Installation */

2015-03-28T19:07:51Z

Installation

← Older revision		Revision as of 12:07, 28 March 2015
Line 98:		Line 98:
	If you are interested only in a Main ROM replacement, then once completed the adapter should just plug in.		If you are interested only in a Main ROM replacement, then once completed the adapter should just plug in.
	If you are after an upgrade to Main ROM and also providing an OPTION ROM, then after you plug the module (and verify the machine boots normally), you need to run a wire from M5 pin 5 to the CE2 via. A good solution here is to solder a wire to CE2, and use a clip to connect to the IC pin.		If you are after an upgrade to Main ROM and also providing an OPTION ROM, then after you plug the module (and verify the machine boots normally), you need to run a wire from M5 pin 5 to the CE2 via. A good solution here is to solder a wire to CE2, and use a clip to connect to the IC pin.

			searching for "mini grabber" on ebay yeilds a solution for the clip.

Sadolph: /* Installation */

2015-03-28T19:05:20Z

Installation

@@ Line 96: / Line 96: @@
 Installation of the hardware is a piece of cake.
+If you are interested only in a Main ROM replacement, then once completed the adapter should just plug in.
-'''Step 1'''
+If you are after an upgrade to Main ROM and also providing an OPTION ROM, then after you plug the module (and verify the machine boots normally), you need to run a wire from M5 pin 5 to the CE2 via.  A good solution here is to solder a wire to CE2, and use a clip to connect to the IC pin.

Sadolph: /* Assembly */

2015-03-28T18:53:45Z

Assembly

@@ Line 38: / Line 38: @@
    Installation using 27C256 requires that the track between via CE1 and adjacent via IC1 be cut.
    Use a dremel tool or sharp hobby knife to remove the copper track.
 == Board ==

Sadolph: /* About */

2015-03-28T18:41:14Z

About

← Older revision		Revision as of 11:41, 28 March 2015
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	[[Image:M100rom1.jpg]]		[[Image:M100rom1.jpg]]

			This is a DIY project; by getting all the parts, you can assemble this yourself without much effort.
	The M100ROM adapter has several (fixed at assembly time) options:		The M100ROM adapter has several (fixed at assembly time) options:

Sadolph: /* Supported Models */

2015-03-28T18:39:13Z

Supported Models

← Older revision		Revision as of 11:39, 28 March 2015
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	== Supported Models ==		== Supported Models ==
	* Model 100 only		* Model 100 only
			* Note: when used with a 27C512 as an Option ROM device, this becomes incompatible with REX

	== About ==		== About ==

Sadolph: /* Assembly */

2015-03-28T18:35:43Z

Assembly

← Older revision		Revision as of 11:35, 28 March 2015
Line 33:		Line 33:

	== Assembly ==		== Assembly ==

			Installation using 27C256 requires that the track between via CE1 and adjacent via IC1 be cut.
			Use a dremel tool or sharp hobby knife to remove the copper track.

	== Board ==		== Board ==

Sadolph: /* Programming the EEPROM after assembly */

2015-03-28T18:32:41Z

Programming the EEPROM after assembly

← Older revision		Revision as of 11:32, 28 March 2015
Line 55:		Line 55:

	On a 27C256, to program the device you must tie pin 1 to Vpp.		On a 27C256, to program the device you must tie pin 1 to Vpp.
	Apply Vpp to IC-1 via ~~between VCC and PGM~~.		Ensure that the track between via CE1 and adjacent via IC1 is cut.
			Apply Vpp to either IC-1 via.

	On a 27C512, to program the device you must tie pin 22 to Vpp.		On a 27C512, to program the device you must tie pin 22 to Vpp.
			No track cuts are required.
	Apply Vpp to PGM via.		Apply Vpp to PGM via.

Sadolph: /* Programming the EEPROM after assembly */

2015-03-28T18:29:27Z

Programming the EEPROM after assembly

← Older revision		Revision as of 11:29, 28 March 2015
Line 55:		Line 55:

	On a 27C256, to program the device you must tie pin 1 to Vpp.		On a 27C256, to program the device you must tie pin 1 to Vpp.
	Apply Vpp to IC-1 via.		Apply Vpp to IC-1 via between VCC and PGM.

	On a 27C512, to program the device you must tie pin 22 to Vpp.		On a 27C512, to program the device you must tie pin 22 to Vpp.

← Older revision		Revision as of 14:33, 4 July 2018
Line 15:		Line 15:
	The M100ROM adapter has several (fixed at assembly time) options:		The M100ROM adapter has several (fixed at assembly time) options:

	1 - Just convert non-standard pinout to standard JEDEC, to use a 256Kb (32KB) (E)EPROM in an old M100.		1 - Just convert non-standard pinout to standard JEDEC, to use a 256Kb (32KB) (E)EPROM in an old M100 (e.g. to update 19xx year to 20xx).
	2 - Same as #1, but using a 512Kb (64KB) (E)EPROM with an option ROM image in the upper half.		2 - Same as #1, but using a 512Kb (64KB) (E)EPROM with an option ROM image in the upper half.
	3 - Same as #2, but without pinout conversion, for use in a 'new' M100.		3 - Same as #2, but without pinout conversion, for use in a 'new' M100.
Line 35:		Line 35:

	== Assembly ==		== Assembly ==

			Modifications for 27C256:

	Installation using 27C256 requires that the track between via CE1 and adjacent via IC1 be cut.		Installation using 27C256 requires that the track between via CE1 and adjacent via IC1 be cut.
	Use a dremel tool or sharp hobby knife to remove the copper track.		Use a dremel tool or sharp hobby knife to remove the copper track.

			Assuming you did not install the diodes and resistor required for the 27C512 you will also need
			to add a jumper in place of the diode closest to the IC (between the labels '1N4148' and '/CE2')

			Although not necessarily required, add a jumper between the via 'Vcc' and adjacent 'IC-1'

	Steps:		Steps:
	* pre-program your device; for 27C256, burn in your presumably updated image. For 27C512, burn in your updated main ROM image in the lower 32k, and program your Option ROM into the upper 32k.		* pre-program your device; for 27C256, burn in your presumably updated image. For 27C512, burn in your updated main ROM image in the lower 32k, and program your Option ROM into the upper 32k.
	* if 27C256 is planned, cut track between via CE1 and adjacent via IC1.		* if 27C256 is planned, cut track between via CE1 and adjacent via IC1; also see above.
	* solder your 28 pins to the PCB. Ensure you place the pins in the rows that make sense. For early M100 use the rows marked "OLD" and for late M100 that have the standard pinout, use "NEW". Lots of ways to do this, but keep in mind that the pins have to be very low profile. The board has to sit right on top of the socket for clearance.		* solder your 28 pins to the PCB. Ensure you place the pins in the rows that make sense. For early M100 use the rows marked "OLD" and for late M100 that have the standard pinout, use "NEW". Lots of ways to do this, but keep in mind that the pins have to be very low profile. The board has to sit right on top of the socket for clearance.

	Solutions for pins include small ~~guage~~ stripped wire, or if you can find them, some stake pins.		Solutions for pins include small gauge stripped wire, or if you can find them, some stake pins.
	If someone finds a good solution for pins, please post here.		If someone finds a good solution for pins, please post here.

	http://www.ebay.com/itm/50x-Batten-and-Allen-BA3760-Dill-Leadframe-DIP-PCB-Edge-Clip-Pins-BASIC-Stamp-/261518387239?pt=LH_DefaultDomain_0&hash=item3ce3b5e827		http://www.ebay.com/itm/50x-Batten-and-Allen-BA3760-Dill-Leadframe-DIP-PCB-Edge-Clip-Pins-BASIC-Stamp-/261518387239?pt=LH_DefaultDomain_0&hash=item3ce3b5e827
	this is a good solution; you'd have to clip off the bottom, insert through the board into the socket, and solder from the top. ~~The~~, trim flush.		this is a good solution; you'd have to clip off the bottom, insert through the board into the socket, and solder from the top. Then, trim flush.

	* insert the IC in the row marked IC, and solder away. Ensure orientation is correct.		* insert the IC in the row marked IC, and solder away. Ensure orientation is correct.