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CP/M 2.1?

J

JohnElliott

Veteran Member
Joined
Sep 1, 2006
Messages
667
Location
Sussex, UK
When I got into CP/M computing in the CP/M 3 era, my understanding of the history of 2.x versions was that it went something like:
  • CP/M 2.0: Released to support bigger disk drives than CP/M 1. Proved to be buggy and was quickly replaced by:
  • CP/M 2.1: Bugfixed version of 2.0.
  • CP/M 2.2: Added BDOS function 40 (write random with zero fill). Soon took over from 2.0 and 2.1 and became universal.
It's possible to find the source for 2.0 and 2.2 on gaby.de and compare it to see the bug fixes. But I've never seen either a source or binary distribution of 2.1. Has such a thing been preserved?

Searching Google Books suggests that 2.2 came very quickly after 2.1. 2.1 is announced in InfoWorld of 31 March 1980 (though the assertions about MP/M in the same paragraph seem to cast some doubt on the whole). A month later, on 28 April 1980, "Digital Marketing" are already advertising Pascal/M for CP/M 2.2. So it's quite possible that 2.1 was only out there for a few weeks before being superseded.

And before anyone asks, this is nothing to do with Amstrad CP/M Plus for the PCW9512, which signs on as "v 2.1". In that case "2.1" is the version of the BIOS, not the BDOS.
 
Hi John,

I didn't even know what machines version 2.1 came on. I've never encountered any information on it in my travels, or seen a guide for it. :(

Generally, you would be someone I would think of if I were looking for it.
 
Might be worth contacting the video author and asking if it's possible to get a copy of the disk? Even a binary should provide a good basis for determining what was changed once you disassemble it.
 
That's not bad - The VG01 image seems to have CP/M 2.1 on it.

The format seems to be a series of sectors ( starting with Sector 1 ) -
13 bytes for the sector header, FF,(high),(low),00,00,00,00,00,00,00,00,00,00 ( 10 x 00 )
256 bytes - the sector data.
6 bytes - (8 bit checksum?),00,00,00,00,00 (5 x 00)

However, there appears to be an interleave. Does anyone know what it is?
 
Just finished brute-forcing the disk for the translation table. It runs a 4:1 interleave.

So the translation table looks like this;

Image Sector : Disk Sector

1 : 1
2 : 14
3 : 11
4 : 8
5 : 5
6 : 2
7 : 15
8 : 12
9 : 9
10 : 6
11 : 3
12 : 16
13 : 13
14 : 10
15 : 7
16 : 4

From this information, I should be able to strip out the binary BDOS and CCP from the 32 boot sectors at the start of the Vector Graphics disk image.
 
I don't have time for more than a quick glance right now, but interestingly when I search for the byte sequence B6 77 C9 3E (which precedes the version number in the 2.0 and 2.2 BDOS) the next byte is 20 rather than 21.
 
Interesting. I'll dump a hex file of the contents of the boot sector, and figure out how to post a binary.

Heer's the first sector:

31 83 02 21 00 A0 22 6D 02 21 03 0F CD D3 01 2A 1â.!.á"m.!..═Ë.*
A2 00 36 61 0E 1C CD 12 02 21 00 10 CD D3 01 3A ó.6a..═..!..═Ë.:
A3 00 FE DA 20 03 32 3E B6 CD 08 BD 21 00 BD CB ú.■┌..2>Â═.¢!.¢╦
5E C2 00 B6 21 A8 01 CD 21 02 C3 00 B6 0D 0A 56 ^┬.Â!¿.═!.├.Â..V
45 43 54 4F 52 20 47 52 41 50 48 49 43 20 34 38 ECTOR.GRAPHIC.48
4B 20 43 50 2F 4D 20 2D 20 56 45 52 53 49 4F 4E K.CP/M.-.VERSION
20 32 2E 31 30 0D 0A 00 22 6B 02 21 6B 02 E5 46 .2.10..."k.!k.ÕF
0E 86 11 83 02 CD A6 00 20 25 E1 E5 11 84 02 1A .å.â.═ª..%ßÕ.ä..
BE 20 1C ED 5B 6D 02 21 8F 02 01 00 01 ED B0 ED ¥..Ý[m.!Å....Ý░Ý
53 6D 02 E1 7E C6 03 E6 0F 77 23 35 20 CD C9 2A Sm.ß~ã.µ.w#5.═╔*
A2 00 11 00 FE 19 E9 3E C0 47 78 D6 01 B7 C2 16 ó...■.Ú>└GxÍ.À┬.
02 0D C2 15 02 C9 7E B7 C8 4F CD 0C B6 23 18 F6 ..┬..╔~À╚O═.Â#.÷
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 5F 01 .............._.

So it does say 2.1, but I'm not certain it is - The other CP/M 2.2 disks all show 2.2 in this way.
 
I'm not sure how this will go here; Here's the full hex dump.


File Size of Image: 338800
First two tracks, 16 sectors per track, 4:1 deinterlaced. I hope I didn't make any mistakes.

0000 - 31 83 02 21 00 A0 22 6D 02 21 03 0F CD D3 01 2A 1â.!.á"m.!..═Ë.*
0010 - A2 00 36 61 0E 1C CD 12 02 21 00 10 CD D3 01 3A ó.6a..═..!..═Ë.:
0020 - A3 00 FE DA 20 03 32 3E B6 CD 08 BD 21 00 BD CB ú.■┌..2>Â═.¢!.¢╦
0030 - 5E C2 00 B6 21 A8 01 CD 21 02 C3 00 B6 0D 0A 56 ^┬.Â!¿.═!.├.Â..V
0040 - 45 43 54 4F 52 20 47 52 41 50 48 49 43 20 34 38 ECTOR.GRAPHIC.48
0050 - 4B 20 43 50 2F 4D 20 2D 20 56 45 52 53 49 4F 4E K.CP/M.-.VERSION
0060 - 20 32 2E 31 30 0D 0A 00 22 6B 02 21 6B 02 E5 46 .2.10..."k.!k.ÕF
0070 - 0E 86 11 83 02 CD A6 00 20 25 E1 E5 11 84 02 1A .å.â.═ª..%ßÕ.ä..
0080 - BE 20 1C ED 5B 6D 02 21 8F 02 01 00 01 ED B0 ED ¥..Ý[m.!Å....Ý░Ý
0090 - 53 6D 02 E1 7E C6 03 E6 0F 77 23 35 20 CD C9 2A Sm.ß~ã.µ.w#5.═╔*
00A0 - A2 00 11 00 FE 19 E9 3E C0 47 78 D6 01 B7 C2 16 ó...■.Ú>└GxÍ.À┬.
00B0 - 02 0D C2 15 02 C9 7E B7 C8 4F CD 0C B6 23 18 F6 ..┬..╔~À╚O═.Â#.÷
00C0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00D0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00E0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00F0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 5F 01 .............._.
0100 - A0 CD D5 A1 C3 86 A7 4E 4F 20 53 50 41 43 45 00 á═ıí├åºNO.SPACE.
0110 - CD 5E A2 C2 09 A2 3A F0 A7 F5 CD 54 A4 CD E9 A0 ═^ó┬.ó:º§═Tñ═Úá
0120 - C2 79 A6 21 CD A7 11 DD A7 06 10 CD 42 A4 2A 88 ┬yª!═º.¦º..═Bñ*ê
0130 - A0 EB CD 4F A2 FE 3D CA 3F A6 FE 5F C2 73 A6 EB áÙ═Oó■=╩?ª■_┬sªÙ
0140 - 23 22 88 A0 CD 5E A2 C2 73 A6 F1 47 21 F0 A7 7E #"êá═^ó┬sª±G!º~
0150 - B7 CA 59 A6 B8 70 C2 73 A6 70 AF 32 CD A7 CD E9 À╩Yª©p┬sªp»2═º═Ú
0160 - A0 CA 6D A6 11 CD A7 CD 0E A1 C3 86 A7 CD EA A3 á╩mª.═º═.í├åº═Ûú
0170 - C3 86 A7 CD 66 A4 C3 09 A2 01 82 A6 CD A7 A0 C3 ├åº═fñ├.ó.éª═ºá├
0180 - 86 A7 46 49 4C 45 20 45 58 49 53 54 53 00 CD F8 åºFILE.EXISTS.═°
0190 - A3 FE 10 D2 09 A2 5F 3A CE A7 FE 20 CA 09 A2 CD ú■.Ê.ó_:╬º■.╩.ó═
01A0 - 15 A1 C3 89 A7 CD F5 A1 3A CE A7 FE 20 C2 C4 A6 .í├ëº═§í:╬º■.┬─ª
01B0 - 3A F0 A7 B7 CA 89 A7 3D 32 EF A7 CD 29 A1 CD BD :ºÀ╩ëº=2´º═)í═¢
01C0 - A0 C3 89 A7 11 D6 A7 1A FE 20 C2 09 A2 D5 CD 54 á├ëº.ͺ.■.┬.óı═T
01D0 - A4 D1 21 83 A7 CD 40 A4 CD D0 A0 CA 6B A7 21 00 ñÐ!âº═@ñ═ðá╩kº!.
01E0 - 01 E5 EB CD D8 A1 11 CD A7 CD F9 A0 C2 01 A7 E1 .ÕÙ═Ïí.═º═¨á┬.ºß
01F0 - 11 80 00 19 11 00 A0 7D 93 7C 9A D2 71 A7 C3 E1 .Ç....á}ô|ÜÊqº├ß
0200 - 2A A5 B5 0E 02 CD F3 AC 22 A2 B5 22 A7 B5 C3 E6 *ÑÁ..═¾¼"óÁ"ºÁ├µ
0210 - AB 0E 80 2A 76 B5 AF 86 23 0D C2 17 AD C9 0C 0D ½.Ç*vÁ»å#.┬.¡╔..
0220 - C8 29 C3 1F AD C5 3A 48 AB 4F 21 01 00 CD 1E AD ╚)├.¡┼:H½O!..═.¡
0230 - C1 79 B5 6F 78 B4 67 C9 2A 6A B5 3A 48 AB 4F CD ┴yÁox┤g╔*jÁ:H½O═
0240 - F3 AC 7D E6 01 C9 21 6A B5 4E 23 46 CD 25 AD 22 ¾¼}µ.╔!jÁN#F═%¡"
0250 - 6A B5 2A 85 B5 EB 2A 70 B5 73 23 72 C9 11 09 00 jÁ*àÁÙ*pÁs#r╔...
0260 - 19 7E 17 D0 C3 64 AB CD 79 AD C3 5D AD CD 38 AD .~.ð├d½═y¡├]¡═8¡
0270 - C8 C3 5E AB 85 6F D0 24 C9 2A 76 B5 3A A4 B5 C3 ╚├^½àoð$╔*vÁ:ñÁ├
0280 - 74 AD 2A 49 AB 11 0E 00 19 7E C9 CD 82 AD 36 00 t¡*I½....~╔═é¡6.
0290 - C9 CD 82 AD F6 80 77 C9 3E 01 32 4B AB C9 2A A5 ╔═é¡÷Çw╔>.2K½╔*Ñ
02A0 - B5 EB 2A 70 B5 7B 96 23 7A 9E C9 CD 9E AD D8 13 ÁÙ*pÁ{û#z×╔═סÏ.
02B0 - 72 2B 73 C9 7B 95 6F 7A 9C 67 C9 0E FF 2A A7 B5 r+s╔{òoz£g╔. *ºÁ
02C0 - EB 2A 89 B5 CD B4 AD D0 C5 CD 11 AD 2A 7A B5 EB Ù*ëÁ═┤¡ð┼═.¡*zÁÙ
02D0 - 2A A7 B5 19 C1 0C CA E3 AD BE C8 CD 9E AD D0 CD *ºÁ.┴.╩Ò¡¥╚═סð═
02E0 - 46 AD C9 77 C9 4E 23 46 C3 24 B6 21 6E B5 C3 E5 F¡╔w╔N#F├$Â!nÁ├Õ
02F0 - AD 21 76 B5 C3 E5 AD CD BB AD CD F1 AD 0E 01 CD ¡!vÁ├Õ¡═╗¡═±¡..═
0300 - 09 A2 21 CE A7 01 0B 00 7E FE 20 CA 33 A4 23 D6 .ó!╬º...~■.╩3ñ#Í
0310 - 30 FE 0A D2 09 A2 57 78 E6 E0 C2 09 A2 78 07 07 0■.Ê.óWxµÓ┬.óx..
0320 - 07 80 DA 09 A2 80 DA 09 A2 82 DA 09 A2 47 0D C2 .Ç┌.óÇ┌.óé┌.óG.┬
0330 - 08 A4 C9 7E FE 20 C2 09 A2 23 0D C2 33 A4 78 C9 .ñ╔~■.┬.ó#.┬3ñx╔
0340 - 06 03 7E 12 23 13 05 C2 42 A4 C9 21 80 00 81 CD ..~.#..┬Bñ╔!Ç.ü═
0350 - 59 A2 7E C9 AF 32 CD A7 3A F0 A7 B7 C8 3D 21 EF Yó~╔»2═º:ºÀ╚=!´
0360 - A7 BE C8 C3 BD A0 3A F0 A7 B7 C8 3D 21 EF A7 BE º¥╚├¢á:ºÀ╚=!´º¥
0370 - C8 3A EF A7 C3 BD A0 CD 5E A2 CD 54 A4 21 CE A7 ╚:´º├¢á═^ó═Tñ!╬º
0380 - 7E FE 20 C2 8F A4 06 0B 36 3F 23 05 C2 88 A4 1E ~■.┬Åñ..6?#.┬êñ.
0390 - 00 D5 CD E9 A0 CC EA A3 CA 1B A5 3A EE A7 0F 0F .ı═Úá╠Ûú╩.Ñ:¯º..
03A0 - 0F E6 60 4F 3E 0A CD 4B A4 17 DA 0F A5 D1 7B 1C .µ`O>.═Kñ.┌.ÑÐ{.
03B0 - D5 E6 03 F5 C2 CC A4 CD 98 A0 C5 CD D0 A1 C1 C6 ıµ.§┬╠ñ═ÿá┼═ðí┴ã
03C0 - 41 CD 92 A0 3E 3A CD 92 A0 C3 D4 A4 CD A2 A0 3E A═Æá>:═Æá├Èñ═óá>
03D0 - 7C CD 92 A0 CD A2 A0 06 01 78 CD 4B A4 E6 7F FE |═Æá═óá..x═Kñµ⌂■
03E0 - 20 C2 F9 A4 F1 F5 FE 03 C2 F7 A4 3E 09 CD 4B A4 .┬¨ñ±§■.┬¸ñ>.═Kñ
03F0 - E6 7F FE 20 CA 0E A5 3E 20 CD 92 A0 04 78 FE 0C µ⌂■.╩.Ñ>.═Æá.x■.
0400 - FE 01 CA 00 00 B9 DA 37 AA E1 70 0E 0D C3 8D A9 ■.╩..╣┌7¬ßp..├ì®
0410 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0420 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0430 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0440 - 00 00 00 00 00 00 00 00 00 00 00 00 00 5E 23 56 .............^#V
0450 - EB E9 21 09 A8 C3 4D AB 21 0B A8 C3 4D AB 21 0D ÙÚ!.¿├M½!.¿├M½!.
0460 - A8 C3 4D AB 21 0F A8 C3 4D AB 0C 0D C8 1A 77 13 ¿├M½!.¿├M½..╚.w.
0470 - 23 C3 6B AB 3A 48 AB 4F CD 1B B6 7C B5 C8 5E 23 #├k½:H½O═.Â|Á╚^#
0480 - 56 23 22 70 B5 23 23 22 72 B5 23 23 22 74 B5 23 V#"pÁ##"rÁ##"tÁ#
0490 - 23 EB 22 8D B5 21 76 B5 0E 08 CD 6A AB 2A 78 B5 #Ù"ìÁ!vÁ..═j½*xÁ
04A0 - EB 21 7E B5 0E 0F CD 6A AB 2A 83 B5 7C 21 9A B5 Ù!~Á..═j½*âÁ|!ÜÁ
04B0 - 36 FF B7 CA B8 AB 36 00 3E FF B7 C9 CD 18 B6 21 6 À╩©½6.> À╔═.Â!
04C0 - 8B B5 4E 23 46 CD 1E B6 AF 2A 72 B5 77 23 77 2A ïÁN#F═.»*rÁw#w*
04D0 - 74 B5 77 23 77 C9 CD 27 B6 B7 C2 52 AB C9 CD 2A tÁw#w╔═'ÂÀ┬R½╔═*
04E0 - B6 B7 C2 52 AB C9 21 A2 B5 4E 23 46 2A 74 B5 5E ÂÀ┬R½╔!óÁN#F*tÁ^
04F0 - 23 56 2A 72 B5 7E 23 66 6F 79 93 78 9A D2 0F AC #V*rÁ~#foyôxÜÊ.¼
0500 - CF A3 13 23 05 C2 FD A1 C9 CD 98 A0 2A 8A A0 7E ¤ú.#.┬²í╔═ÿá*èá~
0510 - FE 20 CA 22 A2 B7 CA 22 A2 E5 CD 8C A0 E1 23 C3 ■.╩"óÀ╩"óÕ═îáß#├
0520 - 0F A2 3E 3F CD 8C A0 CD 98 A0 CD DD A1 C3 82 A3 .ó>?═îá═ÿá═¦í├éú
0530 - 1A B7 C8 FE 20 DA 09 A2 C8 FE 3D C8 FE 5F C8 FE .À╚■.┌.ó╚■=╚■_╚■
0540 - 2E C8 FE 3A C8 FE 3B C8 FE 3C C8 FE 3E C8 C9 1A .╚■:╚■;╚■<╚■>╚╔.
0550 - B7 C8 FE 20 C0 13 C3 4F A2 85 6F D0 24 C9 3E 00 À╚■.└.├Oóàoð$╔>.
0560 - 21 CD A7 CD 59 A2 E5 E5 AF 32 F0 A7 2A 88 A0 EB !═º═YóÕÕ»2º*êáÙ
0570 - CD 4F A2 EB 22 8A A0 EB E1 1A B7 CA 89 A2 DE 40 ═OóÙ"èáÙß.À╩ëóÌ@
0580 - 47 13 1A FE 3A CA 90 A2 1B 3A EF A7 77 C3 96 A2 G..■:╩Éó.:´ºw├ûó
0590 - 78 32 F0 A7 70 13 06 08 CD 30 A2 CA B9 A2 23 FE x2ºp...═0ó╩╣ó#■
05A0 - 2A C2 A9 A2 36 3F C3 AB A2 77 13 05 C2 98 A2 CD *┬®ó6?├½ów..┬ÿó═
05B0 - 30 A2 CA C0 A2 13 C3 AF A2 23 36 20 05 C2 B9 A2 0ó╩└ó.├»ó#6..┬╣ó
05C0 - 06 03 FE 2E C2 E9 A2 13 CD 30 A2 CA E9 A2 23 FE ..■.┬Úó.═0ó╩Úó#■
05D0 - 2A C2 D9 A2 36 3F C3 DB A2 77 13 05 C2 C8 A2 CD *┬┘ó6?├█ów..┬╚ó═
05E0 - 30 A2 CA F0 A2 13 C3 DF A2 23 36 20 05 C2 E9 A2 0ó╩ó.├▀ó#6..┬Úó
05F0 - 06 03 23 36 00 05 C2 F2 A2 EB 22 88 A0 E1 01 0B ..#6..┬‗óÙ"êáß..
 

0600 - 3A 48 AB C6 41 32 21 A9 01 15 A9 CD 1B AA C1 CD :H½ãA2!®..®═.¬┴═
0610 - 1B AA C3 40 A9 42 64 6F 73 20 45 72 72 20 4F 6E .¬├@®Bdos.Err.On
0620 - 20 20 3A 20 24 42 61 64 20 53 65 63 74 6F 72 24 ..:.$Bad.Sector$
0630 - 53 65 6C 65 63 74 24 46 69 6C 65 20 52 2F 4F 24 Select$File.R/O$
0640 - 21 14 AB 7E 36 00 B7 C0 C3 09 B6 CD 40 A9 CD 59 !.½~6.À└├.Â═@®═Y
0650 - A9 D8 F5 4F CD D5 A9 F1 C9 FE 0D C8 FE 0A C8 FE ®Ï§O═ı®±╔■.╚■.╚■
0660 - 09 C8 FE 08 C8 FE 20 C9 3A 14 AB B7 C2 8A A9 CD .╚■.╚■.╔:.½À┬è®═
0670 - 06 B6 E6 01 C8 CD 09 B6 FE 13 C2 87 A9 CD 09 B6 .µ.╚═.Â■.┬ç®═.Â
0680 - FE 03 CA 00 00 AF C9 32 14 AB 3E 01 C9 3A 10 AB ■.╩..»╔2.½>.╔:.½
0690 - B7 C2 A7 A9 C5 CD 68 A9 C1 C5 CD 0C B6 C1 C5 3A À┬º®┼═h®┴┼═.Â┴┼:
06A0 - 13 AB B7 C4 0F B6 C1 79 21 12 AB FE 7F C8 34 FE .½À─.Â┴y!.½■⌂╚4■
06B0 - 20 D0 35 7E B7 C8 79 FE 08 C2 BE A9 35 C9 FE 0A .ð5~À╚y■.┬¥®5╔■.
06C0 - C0 36 00 C9 79 CD 59 A9 D2 D5 A9 F5 0E 5E CD 8D └6.╔y═Y®Êı®§.^═ì
06D0 - A9 F1 F6 40 4F 79 FE 09 C2 8D A9 0E 20 CD 8D A9 ®±÷@Oy■.┬ì®..═ì®
06E0 - 3A 12 AB E6 07 C2 DB A9 C9 0E 08 C3 0C B6 CD E9 :.½µ.┬█®╔..├.Â═Ú
06F0 - A9 0E 20 CD 0C B6 C3 E9 A9 0E 23 CD 8D A9 CD 11 ®..═.Â├Ú®.#═ì®═.
0700 - C3 5C A3 C3 58 A3 7F 00 20 20 20 20 20 20 20 20 ├\ú├Xú⌂.........
0710 - 20 20 20 20 20 20 20 20 43 4F 50 59 52 49 47 48 ........COPYRIGH
0720 - 54 20 28 43 29 20 31 39 37 39 2C 20 44 49 47 49 T.(C).1979,.DIGI
0730 - 54 41 4C 20 52 45 53 45 41 52 43 48 20 20 00 00 TAL.RESEARCH....
0740 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0750 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0760 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0770 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0780 - 00 00 00 00 00 00 00 00 08 A0 00 00 5F 0E 02 C3 .........á.._..├
0790 - 05 00 C5 CD 8C A0 C1 C9 3E 0D CD 92 A0 3E 0A C3 ..┼═îá┴╔>.═Æá>.├
07A0 - 92 A0 3E 20 C3 92 A0 C5 CD 98 A0 E1 7E B7 C8 23 Æá>.├Æá┼═ÿáß~À╚#
07B0 - E5 CD 8C A0 E1 C3 AC A0 0E 0D C3 05 00 5F 0E 0E Õ═îáß├¼á..├.._..
07C0 - C3 05 00 CD 05 00 32 EE A7 3C C9 0E 0F C3 C3 A0 ├..═..2¯º<╔..├├á
07D0 - AF 32 ED A7 11 CD A7 C3 CB A0 0E 10 C3 C3 A0 0E »2ݺ.═º├╦á..├├á.
07E0 - 11 C3 C3 A0 0E 12 C3 C3 A0 11 CD A7 C3 DF A0 0E .├├á..├├á.═º├▀á.
07F0 - 13 C3 05 00 CD 05 00 B7 C9 0E 14 C3 F4 A0 11 CD .├..═..À╔..├¶á.═
0800 - A6 E1 3D C2 71 A7 CD 66 A4 CD 5E A2 21 F0 A7 E5 ªß=┬qº═fñ═^ó!ºÕ
0810 - 7E 32 CD A7 3E 10 CD 60 A2 E1 7E 32 DD A7 AF 32 ~2═º>.═`óß~2¦º»2
0820 - ED A7 11 5C 00 21 CD A7 06 21 CD 42 A4 21 08 A0 ݺ.\.!═º.!═Bñ!.á
0830 - 7E B7 CA 3E A7 FE 20 CA 3E A7 23 C3 30 A7 06 00 ~À╩>º■.╩>º#├0º..
0840 - 11 81 00 7E 12 B7 CA 4F A7 04 23 13 C3 43 A7 78 .ü.~.À╩Oº.#.├Cºx
0850 - 32 80 00 CD 98 A0 CD D5 A1 CD 1A A1 CD 00 01 31 2Ç.═ÿá═ıí═.í═..1
0860 - AB A7 CD 29 A1 CD BD A0 C3 82 A3 CD 66 A4 C3 09 ½º═)í═¢á├éú═fñ├.
0870 - A2 01 7A A7 CD A7 A0 C3 86 A7 42 41 44 20 4C 4F ó.zº═ºá├åºBAD.LO
0880 - 41 44 00 43 4F 4D CD 66 A4 CD 5E A2 3A CE A7 D6 AD.COM═fñ═^ó:╬ºÍ
0890 - 20 21 F0 A7 B6 C2 09 A2 C3 82 A3 00 00 00 00 00 .!ºÂ┬.ó├éú.....
08A0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 24 24 24 .............$$$
08B0 - 20 20 20 20 20 53 55 42 00 00 00 00 00 00 00 00 .....SUB........
08C0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
08D0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
08E0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
08F0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0900 - DE AB C3 EB AD CD F1 AD CD D6 AB C3 EB AD 2A 76 ̽├Ù¡═±¡═ͽ├Ù¡*v
0910 - B5 EB 2A 6E B5 0E 80 C3 6A AB 21 A5 B5 7E 23 BE ÁÙ*nÁ.Ç├j½!ÑÁ~#¥
0920 - C0 3C C9 21 FF FF 22 A5 B5 C9 2A 85 B5 EB 2A A5 └<╔! "ÑÁ╔*àÁÙ*Ñ
0930 - B5 23 22 A5 B5 CD B4 AD D2 3F AE CD 23 AE C9 3A Á#"ÑÁ═┤¡Ê?«═#«╔:
0940 - A5 B5 E6 03 06 05 87 05 C2 46 AE 32 A4 B5 B7 C0 ÑÁµ...ç.┬F«2ñÁÀ└
0950 - C5 CD 00 AD CD 05 AE C1 C3 BD AD 0F 15 C2 5B AE ┼═.¡═.«┴├¢¡..┬[«
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1430 - FF BA CD 0E BB CD E9 BA 18 D4 E5 2A 04 BE 36 A0 ║═.╗═Ú║.ÈÕ*.¥6á
1440 - 11 C8 00 CD 03 BC CD D3 BB E1 CD 50 BB C3 BC BA .╚.═.╝═Ë╗ß═P╗├╝║
1450 - E5 C5 CD 8D BB 36 7F CD 5F BB 36 00 C1 E1 C9 E5 Õ┼═ì╗6⌂═_╗6.┴ß╔Õ
1460 - CD D3 BB D5 C5 2A 04 BE 23 CB 5E 28 0B 3E 08 CD ═Ë╗ı┼*.¥#╦^(.>.═
1470 - E9 BA 3D 20 FA CD 0E BB 0E 55 CB 5E 20 08 CD FF Ú║=.·═.╗.U╦^..═
1480 - BA 0D 20 F6 18 30 CD 0E BB C1 D1 E1 C9 DD 7E 01 ║..÷.0═.╗┴Ðß╔¦~.
1490 - E6 03 D5 5F 16 00 3A 3E B6 B7 21 48 DF 20 03 21 µ.ı_..:>ÂÀ!H▀..!
14A0 - 48 FF 19 D1 C9 ED 53 04 BE 06 04 AF CD 92 BB 36 H .Ð╔ÝS.¥..»═Æ╗6
14B0 - 7F 23 10 FB 18 13 3E 01 18 0E 3E 02 18 0A 3E 03 ⌂#.¹..>...>...>.
14C0 - 18 06 3E 04 18 02 3E 05 B7 2A 0A BE F9 FD E1 E1 ..>...>.À*.¥¨²ßß
14D0 - D1 C1 C9 D5 C5 E5 2A 04 BE DD 7E 01 E6 03 47 23 Ð┴╔ı┼Õ*.¥¦~.µ.G#
14E0 - 7E 4F E6 07 A8 79 28 11 78 F6 20 77 11 FA 00 CD ~Oµ.¿y(.x÷.w.·.═
14F0 - 03 BC 7E E6 07 A8 7E 20 04 E6 20 EE 20 E1 C1 D1 .╝~µ.¿~..µ.¯.ß┴Ð
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1510 - CD E6 AB CD D6 AB CD E1 AC C9 C3 98 AD 3E 01 32 ═µ½═ͽ═ß¼╔├ÿ¡>.2
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1530 - CD CA AC 3A A0 B5 FE 80 DA 3F B2 CD 98 AD C9 CD ═╩¼:áÁ■Ç┌?▓═ÿ¡╔═
1540 - 89 AC CD 96 AC 0E 00 C2 92 B2 CD 50 AC 32 94 B5 ë¼═û¼..┬Æ▓═P¼2öÁ
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1560 - AF 7D B4 C2 6C B2 3E 02 32 4B AB C9 22 A2 B5 EB »}┤┬l▓>.2K½╔"óÁÙ
1570 - 2A 49 AB 01 10 00 09 3A 9A B5 B7 3A 94 B5 CA 88 *I½....:ÜÁÀ:öÁ╩ê
1580 - B2 CD 74 AD 73 C3 90 B2 4F 06 00 09 09 73 23 72 ▓═t¡s├É▓O....s#r
1590 - 0E 02 3A 4B AB B7 C0 C5 CD 9C AC CD E6 AB C1 C5 ..:K½À└┼═£¼═µ½┴┼
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15C0 - 7F C2 DF B2 3A 92 B5 B7 CA DF B2 CD E1 AC CD 77 ⌂┬▀▓:ÆÁÀ╩▀▓═ß¼═w
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15E0 - E1 AC AF 32 92 B5 C5 2A 49 AB EB 21 21 00 19 7E ß¼»2ÆÁ┼*I½Ù!!..~
15F0 - E6 7F F5 7E 17 23 7E 17 E6 1F 4F 7E 1F 1F 1F 1F µ⌂§~.#~.µ.O~....
1600 - 3A B6 E6 E0 21 0C BE B6 32 5F B9 3A 0F BE 11 60 :µÓ!.¥Â2_╣:.¥.`
1610 - B9 12 7E FE 04 30 11 3A 61 B9 FE 02 EB 7E 38 01 ╣.~■.0.:a╣■.Ù~8.
1620 - 87 87 86 E6 0F 32 60 B9 CD 33 B6 32 1A BE C9 ED ççåµ.2`╣═3Â2.¥╔Ý
1630 - 57 F3 E2 39 B9 DD CB 01 E6 DD 7E 00 FE 04 28 18 W¾Ô9╣¦╦.µ¦~.■.(.
1640 - DD 7E 01 E6 0F FE 04 30 05 CD E7 B9 18 03 CD 5D ¦~.µ.■.0.═þ╣..═]
1650 - B9 DD CB 01 66 C8 FB C9 CD E7 B9 18 F1 C9 00 00 ╣¦╦.f╚¹╔═þ╣.±╔..
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1700 - C5 D5 42 4B CD 62 AE 1F D2 10 B0 D1 C1 C3 E4 AF ┼ıBK═b«.Ê.░Ð┴├õ»
1710 - 17 3C CD 5B AE E1 D1 C9 21 00 00 C9 D5 06 00 2A .<═[«ßÐ╔!..╔ı..*
1720 - 49 AB 09 EB CD 79 AD C1 CD 6A AB CD 00 AD C3 F7 I½.Ù═y¡┴═j½═.¡├¸
1730 - AD 0E 00 1E 20 C3 1C B0 CD 6D AD 0E 0C CD A8 AF ¡....├.░═m¡..═¿»
1740 - 2A 49 AB 7E 11 10 00 19 77 CD 1A AE C8 CD 67 AD *I½~....w═.«╚═g¡
1750 - 0E 10 1E 0C CD 1C B0 CD 38 AF C3 49 B0 0E 0C CD ....═.░═8»├I░..═
1760 - A8 AF CD 1A AE C8 0E 00 1E 0C CD 1C B0 CD 38 AF ¿»═.«╚....═.░═8»
1770 - C3 62 B0 0E 0F CD A8 AF CD 1A AE C8 CD B5 AC 7E ├b░..═¿»═.«╚═Á¼~
1780 - F5 E5 CD 79 AD EB 2A 49 AB 0E 20 D5 CD 6A AB CD §Õ═y¡Ù*I½..ı═j½═
1790 - 91 AD D1 21 0C 00 19 4E 21 0F 00 19 46 E1 F1 77 æ¡Ð!...N!...Fß±w
17A0 - 79 BE 78 CA AD B0 3E 00 DA AD B0 3E 80 2A 49 AB y¥x╩¡░>.┌¡░>Ç*I½
17B0 - 11 0F 00 19 77 C9 7E 23 B6 2B C0 1A 77 13 23 1A ....w╔~#Â+└.w.#.
17C0 - 77 1B 2B C9 AF CD B0 B5 CD 38 AD C0 CD 82 AD E6 w.+╔»═░Á═8¡└═页
17D0 - 80 C0 0E 0F CD A8 AF CD 1A AE C8 01 10 00 CD 79 Ç└..═¿»═.«╚...═y
17E0 - AD 09 EB 2A 49 AB 09 0E 10 3A 9A B5 B7 CA 04 B1 ¡.Ù*I½...:ÜÁÀ╩.▒
17F0 - 7E B7 1A C2 F7 B0 77 B7 C2 FD B0 7E 12 BE C2 3C ~À.┬¸░wÀ┬²░~.¥┬<
1800 - C9 3A 00 BD A0 F5 3E C3 32 00 00 21 03 B6 22 01 ╔:.¢á§>├2..!.Â".
1810 - 00 32 05 00 21 06 A8 22 06 00 21 80 00 22 1C BE .2..!.¿"..!Ç.".¥
1820 - 3A 04 00 4F F1 CA 03 A0 C3 00 A0 3A 3E B6 B7 20 :..O±╩.á├.á:>ÂÀ.
1830 - 06 CD 03 E0 C8 18 0C 3A 65 B9 B7 C0 CD DC C0 C8 .═.Ó╚..:e╣À└═▄└╚
1840 - 32 66 B9 3E FF 32 65 B9 C9 CD 2B B7 28 FB 3A 3E 2f╣> 2e╣╔═+À(¹:>
1850 - B6 B7 28 09 AF 32 65 B9 3A 66 B9 18 03 CD 06 E0 ÂÀ(.»2e╣:f╣..═.Ó
1860 - 21 00 BD CB 66 CB BF C0 FE 10 28 0A FE 0B C0 0E !.¢╦f╦┐└■.(.■.└.
1870 - 0C CD A3 B7 18 D3 3A 3D B6 2F 32 3D B6 18 CA C5 .═úÀ.Ë:=Â/2=Â.╩┼
1880 - CD 98 B7 C1 3A 3D B6 B7 C8 21 00 BD 7E CB FE E5 ═ÿÀ┴:=ÂÀ╚!.¢~╦■Õ
1890 - F5 CD A3 B7 F1 E1 77 C9 3A 3E B6 B7 79 CA 09 E0 §═úÀ±ßw╔:>ÂÀy╩.Ó
18A0 - C3 98 C0 21 00 BD 7E E6 07 28 ED C3 11 BD 3A 00 ├ÿ└!.¢~µ.(Ý├.¢:.
18B0 - BD E6 07 3E FF C8 C3 0E BD 21 00 00 22 11 BE C9 ¢µ.> ╚├.¢!..".¥╔
18C0 - 79 21 00 00 FE 04 D0 32 10 BE 6F 29 29 29 29 11 y!..■.ð2.¥o)))).
18D0 - 3F B6 19 C9 ED 43 11 BE C9 79 32 13 BE C9 ED 43 ?Â.╔ÝC.¥╔y2.¥╔ÝC
18E0 - 1C BE C9 60 69 C9 ED 73 2A BF 31 EE BF AF 32 18 .¥╔`i╔Ýs*┐1¯┐»2.
18F0 - BE CD 88 B8 C4 E8 B8 06 01 CD C8 B8 3A 1A BE ED ¥═ê©─Þ©..═╚©:.¥Ý
 
1900 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
1910 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
1920 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
1930 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
1940 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
1950 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
1960 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
1970 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
1980 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
1990 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
19A0 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
19B0 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
19C0 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
19D0 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
19E0 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
19F0 - E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 E5 ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
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1A40 - EE B3 3A 9B B5 B7 CA 5F B5 2A 49 AB 36 00 3A 9D ¯│:øÁÀ╩_Á*I½6.:Ø
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1ED0 - 32 4B AB C9 CD 98 AD C3 91 AD 3E 01 32 92 B5 3E 2K½╔═ÿ¡├æ¡>.2ÆÁ>
1EE0 - FF 32 90 B5 CD CA AC 3A A0 B5 21 9E B5 BE DA 04 2ÉÁ═╩¼:áÁ!×Á¥┌.
1EF0 - B2 FE 80 C2 1A B2 CD 77 B1 AF 32 A0 B5 3A 4B AB ▓■Ç┬.▓═w▒»2áÁ:K½
1F00 - 7B 2A BF C9 ED 73 2A BF 31 EE BF AF 32 1A BE 79 {*┐╔Ýs*┐1¯┐»2.¥y
1F10 - 32 1B BE FE 01 28 4A FE 02 20 14 3A 10 BE FE 04 2.¥■.(J■...:.¥■.
1F20 - 3E 10 38 02 3E 40 32 18 BE 11 14 BE CD BF B8 21 >.8.>@2.¥..¥═┐©!
1F30 - 18 BE 7E B7 28 2B 35 21 14 BE 06 04 CD B4 B8 20 .¥~À(+5!.¥..═┤©.
1F40 - 20 3A 10 BE FE 04 3E 20 38 02 3E 50 21 17 BE 34 .:.¥■.>.8.>P!.¥4
1F50 - BE 20 09 36 00 2A 15 BE 23 22 15 BE CD 88 B8 18 ¥..6.*.¥#".¥═ê©.
1F60 - 0A AF 32 18 BE CD 88 B8 C4 E8 B8 06 00 CD C8 B8 .»2.¥═ê©─Þ©..═╚©
1F70 - 3A 1B BE FE 01 3A 1A BE 20 09 B7 20 06 CD EC B8 :.¥■.:.¥..À..═ý©
1F80 - 3A 1A BE ED 7B 2A BF C9 AF 32 1A BE 21 0C BE 06 :.¥Ý{*┐╔»2.¥!.¥.
1F90 - 03 CD B4 B8 20 06 3A 13 BE 1F BE C8 3A 19 BE B7 .═┤©..:.¥.¥╚:.¥À
1FA0 - C4 EC B8 11 0C BE CD BF B8 3A 13 BE B7 1F 32 0F ─ý©..¥═┐©:.¥À.2.
1FB0 - BE 2F B7 C9 11 10 BE 1A BE C0 23 13 10 F9 C9 21 ¥/À╔..¥.¥└#..¨╔!
1FC0 - 10 BE 01 04 00 ED B0 C9 3A 13 BE E6 01 0F 5F 16 .¥...Ý░╔:.¥µ.._.
1FD0 - 00 21 2A BE 19 ED 5B 1C BE CB 40 20 05 2F 32 19 .!*¥.Ý[.¥╦@../2.
1FE0 - BE EB 01 80 00 ED B0 C9 3E 01 18 02 3E 02 DD 21 ¥Ù.Ç.Ý░╔>...>.¦!
1FF0 - 5E B9 32 5E B9 AF 32 19 BE 2A 0D BE 22 61 B9 3A ^╣2^╣»2.¥*.¥"a╣:
 
The resultant binary extracted from the boot sectors.

I am not certain it's correct, but I've been quite careful in it's extraction from the original file.
 

Attachments

  • VZ-CPM21.zip
    6 KB · Views: 0
Here's Sector 1 of the CP/M 2.2 disk. It's very different and I wonder if VG were making up their own version numbers - though much code is still the same.

0000 - 31 83 02 21 00 C0 22 6D 02 21 03 0F CD ED 01 2A 1â.!.└"m.!..═Ý.*
0010 - A2 00 36 61 0E 1C CD 2C 02 21 00 10 CD ED 01 CD ó.6a..═,.!..═Ý.═
0020 - 08 DD 21 00 DD CB 5E C2 00 D6 3E E0 1F 1F E6 3F .¦!.¦╦^┬.Í>Ó..µ?
0030 - 06 00 D6 0A 38 03 04 18 F9 C6 3A 32 D2 01 78 C6 ..Í.8...¨ã:2Ê.xã
0040 - 30 32 D1 01 21 C0 01 7E B7 CA 00 D6 4F E5 CD 0C 02Ð.!└.~À╩.ÍOÕ═.
0050 - D6 E1 23 18 F2 0D 0A 56 45 43 54 4F 52 20 47 52 Íß#.‗..VECTOR.GR
0060 - 41 50 48 49 43 20 30 30 4B 20 43 50 2F 4D 20 2D APHIC.00K.CP/M.-
0070 - 20 56 45 52 53 49 4F 4E 20 32 2E 32 30 20 41 0D .VERSION.2.20.A.
0080 - 0A 00 22 6B 02 21 6B 02 E5 46 0E 86 11 83 02 CD .."k.!k.ÕF.å.â.═
0090 - A6 00 20 25 E1 E5 11 84 02 1A BE 20 1C ED 5B 6D ª..%ßÕ.ä..¥..Ý[m
00A0 - 02 21 8F 02 01 00 01 ED B0 ED 53 6D 02 E1 7E C6 .!Å....Ý░ÝSm.ß~ã
00B0 - 03 E6 0F 77 23 35 20 CD C9 2A A2 00 11 00 FE 19 .µ.w#5.═╔*ó...■.
00C0 - E9 3E C0 47 78 D6 01 B7 C2 30 02 0D C2 2F 02 C9 Ú>└GxÍ.À┬0..┬/.╔
00D0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00E0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00F0 - 00 00 00 00 00 00 00 00 00 00 00 00 00 00 5F 01 .............._.
 
I think the skew may be different on the boot and data tracks, but I managed to extract the BDOS from VG01.VGI and compare it to a stock CP/M 2.0 BDOS. It looks as if two patches have been applied to the binary image:
  • At offset 07FDh (in GET$BLOCK), the instruction JP NC,RETBLOCK0 is replaced by a JP NC to offset 0DC0h. This is a four-line patch:
Code: 
LD A,C
OR B
JP NZ,LEFTTST
JP RETBLOCK0
The background of this seems to be that when searching for a free block to allocate, GET$BLOCK will start at position BC and look, alternately, left and right in the allocation vector. If it finds a free block it will return that block. If it doesn't, it will return zero.

Without the patch, what happens is that it returns zero when there are no more blocks to the right, even if the search hasn't reached the end going left. Thus a write may fail with 'disk full' if the file being extended is near the end of the disk and there are still free blocks near the beginning.

  • At offset 08C5h (in CLOSE) the instruction LD (LRET),A is replaced by a call to offset 0DB0h. This is a subroutine:
Code: 
LD (LRET),ALD (DCNT),A
LD (DCNT+1),A
RET

Both of these fixes are also present in CP/M 2.2, assembled in place rather than added as binary patches.

That suggests that, at least in this case, CP/M 2.1 was CP/M 2.0 with a couple of bugfixes patched into the BDOS.
 
Starcat said:
V
There is also a Pickles & Trout CP/M 2.1A TRS-80 floppy for sale on eBay currently:
https://www.ebay.com/itm/135040022142
Click to expand...
I saw that, but since I haven't any means of reading 8" floppy discs I don't think I'd get further by ordering it.

(Aside: The development of P&T CP/M seems to be another piece of history lost in obscurity. There's a newsletter announcing the release of P&T CP/M 2.2m at http://bitsavers.trailing-edge.com/pdf/picklesAndTrout/Trisoft_Newsletter.pdf and that also mentions "2.2e" with an implication that that was the previous version. And then there's the pictured 2.1A boot floppy. But whether there were also versions B, C and D...)
 
That's pretty interesting. So very little different, but two patched routines in the file handling to address bugs.

What are the implications for calling a subroutine at 0DB0h rather than setting LRET, DCNT and DCNT+1 to A?
 
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