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Tweaking LS-DOS to handle the extra banks wouldвЂ™ve been a snap. Just a bit more work could have resulted in the use of the 8 Mhz Z-80H, and 256K DRAMs in the 4164 sockets. They could have substituted 720K 3.5' drives and the graphics board very easily. On a personal note, I think itвЂ™s a shame Tandy didnвЂ™t at least offer a hot-rod version of the Model 4D as a going-away gesture to the grand old TRS-80 line.

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It also makes running asm code in the banks far more trickier because the Z-80 M1 machine cycle has more stringent timing requirements.

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This is the reason the NGA Model 4s have more trouble handling speedup mods and the XLR8er board. THATвЂ™s why the DB-25 connector for the RS-232 port points out the back of the cabinet, not down.ДЇor the techies, the old NGA Model 4s did not truly run at the advertised 4 megahertz clock speed the use of slow logic chips necessitated the insertion of wait states into the Z-80 bus cycle that yielded an effective clock rate of only 3.5 Mhz (approximately).

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The old NGA machines had separate circuit boards for the Floppy Disk Controller and the RS-232 serial port circuitry. Many veteran TRS gamers were perturbed at the new arrangement!ДЇurthermore, the GA CPU board contained all the computerвЂ™s digital electronics. The NGA Model 4s have two arrow keys on each side of the keyboard. The keyboards had not only a backspace key, but the arrow keys were collected into a single cluster of four. They were distinguished by the suffix вЂњAвЂќ appended to the RS cat# i.e. Those вЂњlater Model 4sвЂќ with the green screen and new keyboard are known as the Gate Array Model 4s.

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The February 1990 issue of Computer News 80 reported that Radio Shack still had вЂњa warehouse full of Model 4DвЂ™s and two warehouses full of unassembled parts.вЂќ Both continuing education sales (a Model 4 was required to control the Network 4 classroom networking system) and niche interest meant that sales continued longer than Radio Shack had intended. ItвЂ™s not clear exactly when the Model 4D was discontinued because it could still be ordered from Radio Shack after it was no longer sold in stores. The Model 4D appeared in Radio Shack catalogs until 1990.

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In that same interview, Ron Stegall also stated, вЂњThird party software for the 4 is a fact of life.вЂќ That was true but a thriving market for third party Model 4 software lasted into the late 1990вЂ™s. It continued to receive little to no promotion and Radio Shack made no secret of the fact that there were no plans to develop any new Model 4 software or hardware. Unfortunately, the release of the Model 4D didnвЂ™t signal a new emphasis by Radio Shack on the Model 4 line. He stated in an interview with 80 Micro, вЂњWe intentionally came out the 4D including DeskMate to get rumors stopped.вЂќ According to Ron Stegall, Tandy senior vice president, the Model 4D was introduced partly to address those rumors. At the time, Radio Shack had been widely rumored to be on the verge of discontinuing the entire Model 4 line. The introduction of the Model 4D came as a bit of a surprise to many observers. Perhaps because of the mature state of the TRS-80 software market, DeskMate for the Model 4 was never very popular. DeskMate contained components for word processing, spreadsheet, database, communications, calendar, and electronic mail. In fact, the D in 4D stood for DeskMate, not double-sided drives as most people imagined.

Radio Shack marketing presented Model 4 DeskMate as the biggest selling point for the Model 4D.

DeskMate for the Model 4 was also available for sale separately (catalog number 26-1608) for $199.95 (later $99.95). Although the MS-DOS version of DeskMate was the first and best known, Radio Shack also created versions for most of their computers. DeskMateДeskMate, an integrated software package developed by Radio Shack, was included with the Model 4D. However, not all of these changes were unique to the Model 4D some of them (such as the keyboard and green screen) were present in later Model 4вЂ™s.ДЄlthough early press announcements stated that the Model 4D would come with 128K of memory, this proved not to be true. Also, the operating system was updated to TRSDOS 6.2.1 (and LS-DOS 6.3 much later).

The integrated software package DeskMate was included.

The RS-232 connector was repositioned to face outward rather than downward.

The keyboard was also slightly different, with a backspace key on the right side.

The internal electronics were simplified compared to the original Model 4.

The name Radio Shack was replaced by Tandy in the nameplate.

It used a very pleasant green phosphor screen instead of the white phosphor screen used by the Model 4.

It had two double-sided floppy drives rather than the single-sided drives in the Model 4.

The Model 4D differed from the original Model 4 in several areas:

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