Category: Uncategorized

Thanks to eagle eyed David S, I am told that Jens Guenther has updated his Windows/Linux fork of the SDLTRS Emulator to v1.2.29

Changelog:

• Added 1024 KB memory support for TCS Genie IIIs.
• Added 512 KB memory support for TRS-80 Model I Selector.
• Added 2nd printer MMIO for TRS-80 Model III/4/4P.
• Added more shortcuts for command line options.
• Added SDL2 aspect ratio option in GUI.
• Added debugger command to change Z80 HALT action.
• Fixed TRS-80 Model 4 MMIO in map 0.
• Fixed redraw of HRG1B screen.
• Fixed IMPORT.COM utility for CP/M 3.0.
• Fixed debugger alternate register set assignment by Nick Andrew.

You check it all out at https://gitlab.com/jengun/sdltrs/-/releases.

Steve H. has sent in a bunch of scans … Thank you, Steve!

Catalogs

Title: CLOAD Magazine
Publisher: CLOAD Magazine
Year: 19xx
Size: 709,924
Pages: 2

Title: Computer TEXTile Catalog
Publisher: Computer TEXTile
Year: 19xx
Size: 2,888,502
Pages: 6

Title: TRS Yellow Page
Publisher: Micro Architect
Year: 1978
Size: 2,581,055
Pages: 8
Notes: [78-11]

Magazines

Title: CLOAD Magazine 1978-08
Publisher: CLOAD Magazine Inc
Year: 1978
Size: 1,493,333
Pages: 4
Notes: [Set 2]

Title: Level One Magazine
Publisher: Level One Magazine
Year: 19xx
Size: 1,359,518
Pages: 4

Title: TRS-80 Computing
Issue: Vol 1 No 1
Publisher: Computer Information Exchange Inc
Year: 1978
Size: 16,654,542
Pages: 32

Service Manuals

Title: 16K RAM Expansion Service Manual Addendum
Publisher: Tandy
Year: 1978
Size: 758,978
Pages: 4
Notes: [26-1101]

Hardware Manuals

Title: Important Notice Regarding Model I Mini-Disk Drives
Publisher: Radio Shack
Year: 19xx
Size: 240,607
Pages: 1

Title: Model I Double Density System Start-Up
Publisher: Tandy
Year: 19xx
Size: 2,445,499
Pages: 2

Title: Oasis Systems Light Pen Users Manual
Publisher: Oasis Systems
Year: 1980
Size: 2,269,574
Pages: 11

After a LOT of work (including an entire new pass over the entire Level II ROM disassembly), I have completed a commented disassembly of BASIC/CMD as was packaged with TRSDOS v2.3

The disassembly of BASIC/CMD can be found here.

Quentin Barnes has updated the Catweasel Utilities to v4.10

New to this release are:

• Add -S option. This option allows the user to specify a minimum number of sectors per track and side. If that minimum is not reached during a read, it’ll trigger a retry.
• Extend the -x and -X option argument syntax when specifying a track range to also allow giving sides.
• Add partial support for RX02 in dmk2jv3.

The -S is a feature that I find to be a necessary evil. Many disks with issues can erroneously report an end of track data before all the retries are finished, and CW2DMK would then decide “Oh, OK – then this track is 7 good sectors” when it really is “7 good, 11 bad” that was just mishandled. With this, you can make a second pass that FORCES CW2DMK to keep re-reading until it either gets 18 good sectors or the retry count expires.

A ZIP file with the DOS, Linux, and Source Code can be downloaded here.

The main GITHUB can found at https://github.com/qbarnes/cw2dmk/.

Right now the following auctions are live.

• TRS-80 Book: TRS-80 Color Computer Technical Reference Manual
• TRS-80 Book: Custom TRS-80 and Other Mysteries (1st Ed)
• TRS-80 Book: Level 1 User’s Manual
• TRS-80 Book: TRS-80 Interfacing, Book 1 (1st Ed 2nd Printing)
• TRS-80 Book: TRS-80 Interfacing, Book 1 (1st Ed 4th Printing)
• TRS-80 Book: TRS-80 Programs
• TRS-80 Book: TRS-80 Micro Computer Technical Reference Manual (1st Ed)
• TRS-80 Book: TRS-80 Model III Operation and BASIC Reference Manual
• TRS-80 Book: VisiCalc for the TRS-80 Model I and Model III Computers
• TRS-80 Book: The Z-80 Microcomputer Handbook
• TRS-80 Software: Cosmic Patrol (c) Instant Software
• TRS-80 Software: Dancing Demon (c) Tandy
• TRS-80 Software: Easy Calc (c) Instant Software
• TRS-80 Software: Invasion Force (c) Tandy
• TRS-80 Software: Keyboard Debounce / Real Time Clock (c) Tandy
• TRS-80 Software: T-Bug (c) Tandy
• TRS-80 Software: Visicalc Model I (c) Personal Software / Tandy
• TRS-80 Software: Model I Double Density Disk Systems DOS and Owner’s Manual (c) Tandy
• TRS-80 Software: Defense Command / Stellar Escort (c) Big Five / Tandy
• TRS-80 Software: Editor/Assembler (c) Tandy

TRS8BIT – Vol 18, No. 1

Click to Enlarge

We have the first news of the 2024 competition from George Phillips. There are articles from Ian Mavric on replacing Co-Co 2 keyboard membranes, a very detailed account of the FB series of disk drives and looks forward to the 2024 T.A. Jim Adams hunts down the start of BASIC making, what is a ‘must go to’ guide. E.T. Fonehume creates a BASIC one-liner to print a 5×5 magic square using consecutive numbers. Juergen Buessert explains how to create a ‘WAV’ file from a DMK image. Vince Otten continues his series ‘Software Tools in BASIC’ with episode 3, ‘Open For Business’ and an article using ROM calls from TRSDOS. Tony G sends details of various pieces of hardware he created, ‘back in the day’. And, of course, there’s the regular features of ‘The Way We Were’, U.K. Ebay bargains, various finds from ‘Surfin the Net’ and finally, there’s a BASIC one-liner game for all you M2 fans. (Is this a first I wonder?)

Issue Information:

Table of Contents:

Two sets of auctions sold … So I will keep going …

Right now the following auctions are live.

• Disk Editor Assembler (26-2202)
• Disk Payroll (26-1556)
• Disk Accounts Receivable (26-1555)
• Disk General Ledger I (26-1552)
• Tape Budget Management (26-1603)
• Tape Assembly Language Tutor (26-2017)
• Disk Accounts Payable (26-1554)
• Tape In Memory Information System (26-1502)
• Tape Videotex/Compuserve Information Service
• Knights of the Desert: North African Campaign 1941-43 by Strategic Simulations Inc. (Tape)

Ian Mavric was kind enough to provide the Model 4 Service Manual Addendum. Thank you, Ian!

Title: Model 4 and Model 4 Gate Array Service Manual Addendum
Publisher: Tandy
Year: 1985
Size: 6,420,877

A site visitor has a working Model 4 (or at least drive :0 does) for sale for $300 for local pickup. Unit does have a loose connection in the plug at the power supply that powers the CRT filament, although most of the time the connection is good as is. Probably an easy fix. Drive 1 works when in Drive 0 position, so perhaps there is an issue with the controller or cable for the :1 position.

Seller is located about 100 miles NW of San Antonio, TX a few miles off of I-10; and could meet in or around Kerrville, Texas if that’s better.

If this sounds good, please reach out directly to Brick Parrish at .

Jay Crutti has designed a full Model 4 keyboard replacement. You can get more information Here.

Right now, you can build it yourself, although Jay is contemplating selling them in the future.